Merge remote-tracking branch 'origin/main' into njpm/metadata-remote-write-wiring-2-update

Signed-off-by: Nicolás Pazos <npazosmendez@gmail.com>

.github/CODEOWNERS

@@ -1,7 +1,10 @@
 /web/ui @juliusv
 /web/ui/module @juliusv @nexucis
 /storage/remote @csmarchbanks @cstyan @bwplotka @tomwilkie
+/storage/remote/otlptranslator @gouthamve @jesusvazquez
 /discovery/kubernetes @brancz
-/tsdb @codesome
+/tsdb @jesusvazquez
 /promql @roidelapluie
 /cmd/promtool @dgl
+/documentation/prometheus-mixin @metalmatze
+

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,14 +1,16 @@
 <!--
+    Please give your PR a title in the form "area: short description".  For example "tsdb: reduce disk usage by 95%"
+
+    If your PR is to fix an issue, put "Fixes #issue-number" in the description.
+
     Don't forget!
 
-    - Please sign CNCF's Developer Certificate of Origin and sign-off your commits by adding the -s / --sign-off flag to `git commit`. See https://github.com/apps/dco for more information.
+    - Please sign CNCF's Developer Certificate of Origin and sign-off your commits by adding the -s / --signoff flag to `git commit`. See https://github.com/apps/dco for more information.
 
     - If the PR adds or changes a behaviour or fixes a bug of an exported API it would need a unit/e2e test.
 
     - Where possible use only exported APIs for tests to simplify the review and make it as close as possible to an actual library usage.
 
-    - No tests are needed for internal implementation changes.
-
     - Performance improvements would need a benchmark test to prove it.
 
     - All exposed objects should have a comment.

.github/dependabot.yml

@@ -4,6 +4,13 @@ updates:
     directory: "/"
     schedule:
       interval: "monthly"
+    groups:
+      k8s.io:
+          patterns:
+            - "k8s.io/*"
+      go.opentelemetry.io:
+          patterns:
+            - "go.opentelemetry.io/*"
   - package-ecosystem: "gomod"
     directory: "/documentation/examples/remote_storage"
     schedule:
@@ -16,6 +23,10 @@ updates:
     directory: "/"
     schedule:
       interval: "monthly"
+  - package-ecosystem: "github-actions"
+    directory: "/scripts"
+    schedule:
+      interval: "monthly"
   - package-ecosystem: "docker"
     directory: "/"
     schedule:

.github/workflows/buf-lint.yml

@@ -4,19 +4,22 @@ on:
     paths:
       - ".github/workflows/buf-lint.yml"
       - "**.proto"
+permissions:
+  contents: read
+
 jobs:
   buf:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: bufbuild/buf-setup-action@v1.16.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: bufbuild/buf-setup-action@382440cdb8ec7bc25a68d7b4711163d95f7cc3aa # v1.28.1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
-      - uses: bufbuild/buf-lint-action@v1
+      - uses: bufbuild/buf-lint-action@bd48f53224baaaf0fc55de9a913e7680ca6dbea4 # v1.0.3
         with:
           input: 'prompb'
-      - uses: bufbuild/buf-breaking-action@v1
+      - uses: bufbuild/buf-breaking-action@f47418c81c00bfd65394628385593542f64db477 # v1.1.2
         with:
           input: 'prompb'
           against: 'https://github.com/prometheus/prometheus.git#branch=main,ref=HEAD,subdir=prompb'

.github/workflows/buf.yml

@@ -3,23 +3,27 @@ on:
   push:
     branches:
       - main
+permissions:
+  contents: read
+
 jobs:
   buf:
     name: lint and publish
     runs-on: ubuntu-latest
+    if: github.repository_owner == 'prometheus'
     steps:
-      - uses: actions/checkout@v3
-      - uses: bufbuild/buf-setup-action@v1.16.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: bufbuild/buf-setup-action@382440cdb8ec7bc25a68d7b4711163d95f7cc3aa # v1.28.1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
-      - uses: bufbuild/buf-lint-action@v1
+      - uses: bufbuild/buf-lint-action@bd48f53224baaaf0fc55de9a913e7680ca6dbea4 # v1.0.3
         with:
           input: 'prompb'
-      - uses: bufbuild/buf-breaking-action@v1
+      - uses: bufbuild/buf-breaking-action@f47418c81c00bfd65394628385593542f64db477 # v1.1.2
         with:
           input: 'prompb'
           against: 'https://github.com/prometheus/prometheus.git#branch=main,ref=HEAD~1,subdir=prompb'
-      - uses: bufbuild/buf-push-action@v1
+      - uses: bufbuild/buf-push-action@342fc4cdcf29115a01cf12a2c6dd6aac68dc51e1 # v1.1.1
         with:
           input: 'prompb'
           buf_token: ${{ secrets.BUF_TOKEN }}

.github/workflows/ci.yml

@@ -11,10 +11,10 @@ jobs:
     # Whenever the Go version is updated here, .promu.yml
     # should also be updated.
     container:
-      image: quay.io/prometheus/golang-builder:1.20-base
+      image: quay.io/prometheus/golang-builder:1.21-base
     steps:
-      - uses: actions/checkout@v3
-      - uses: prometheus/promci@v0.1.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
       - uses: ./.github/promci/actions/setup_environment
       - run: make GO_ONLY=1 SKIP_GOLANGCI_LINT=1
       - run: go test ./tsdb/ -test.tsdb-isolation=false
@@ -32,11 +32,11 @@ jobs:
     # Whenever the Go version is updated here, .promu.yml
     # should also be updated.
     container:
-      image: quay.io/prometheus/golang-builder:1.20-base
+      image: quay.io/prometheus/golang-builder:1.21-base
 
     steps:
-      - uses: actions/checkout@v3
-      - uses: prometheus/promci@v0.1.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
       - uses: ./.github/promci/actions/setup_environment
         with:
           enable_go: false
@@ -52,10 +52,10 @@ jobs:
     name: Go tests on Windows
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-go@v4
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
         with:
-          go-version: '>=1.20 <1.21'
+          go-version: 1.21.x
       - run: |
           $TestTargets = go list ./... | Where-Object { $_ -NotMatch "(github.com/prometheus/prometheus/discovery.*|github.com/prometheus/prometheus/config|github.com/prometheus/prometheus/web)"}
           go test $TestTargets -vet=off -v
@@ -66,9 +66,9 @@ jobs:
     runs-on: ubuntu-latest
     # The go verson in this image should be N-1 wrt test_go.
     container:
-      image: quay.io/prometheus/golang-builder:1.19-base
+      image: quay.io/prometheus/golang-builder:1.20-base
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - run: make build
       - run: go test ./tsdb/...
       - run: go test ./tsdb/ -test.tsdb-isolation=false
@@ -79,9 +79,9 @@ jobs:
     # Whenever the Go version is updated here, .promu.yml
     # should also be updated.
     container:
-      image: quay.io/prometheus/golang-builder:1.19-base
+      image: quay.io/prometheus/golang-builder:1.20-base
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - run: go install ./cmd/promtool/.
       - run: go install github.com/google/go-jsonnet/cmd/jsonnet@latest
       - run: go install github.com/google/go-jsonnet/cmd/jsonnetfmt@latest
@@ -104,8 +104,8 @@ jobs:
       matrix:
         thread: [ 0, 1, 2 ]
     steps:
-      - uses: actions/checkout@v3
-      - uses: prometheus/promci@v0.1.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
       - uses: ./.github/promci/actions/build
         with:
           promu_opts: "-p linux/amd64 -p windows/amd64 -p linux/arm64 -p darwin/amd64 -p darwin/arm64 -p linux/386"
@@ -127,8 +127,8 @@ jobs:
     # Whenever the Go version is updated here, .promu.yml
     # should also be updated.
     steps:
-      - uses: actions/checkout@v3
-      - uses: prometheus/promci@v0.1.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
       - uses: ./.github/promci/actions/build
         with:
           parallelism: 12
@@ -138,19 +138,21 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - name: Install Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
         with:
-          go-version: 1.20.x
+          cache: false
+          go-version: 1.21.x
       - name: Install snmp_exporter/generator dependencies
         run: sudo apt-get update && sudo apt-get -y install libsnmp-dev
         if: github.repository == 'prometheus/snmp_exporter'
       - name: Lint
-        uses: golangci/golangci-lint-action@v3.4.0
+        uses: golangci/golangci-lint-action@3a919529898de77ec3da873e3063ca4b10e7f5cc # v3.7.0
         with:
           args: --verbose
-          version: v1.51.2
+          # Make sure to sync this with Makefile.common and scripts/golangci-lint.yml.
+          version: v1.55.2
   fuzzing:
     uses: ./.github/workflows/fuzzing.yml
     if: github.event_name == 'pull_request'
@@ -163,8 +165,8 @@ jobs:
     needs: [test_ui, test_go, test_windows, golangci, codeql, build_all]
     if: github.event_name == 'push' && github.event.ref == 'refs/heads/main'
     steps:
-      - uses: actions/checkout@v3
-      - uses: prometheus/promci@v0.1.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
       - uses: ./.github/promci/actions/publish_main
         with:
           docker_hub_login: ${{ secrets.docker_hub_login }}
@@ -172,13 +174,13 @@ jobs:
           quay_io_login: ${{ secrets.quay_io_login }}
           quay_io_password: ${{ secrets.quay_io_password }}
   publish_release:
-    name: Publish release arfefacts
+    name: Publish release artefacts
     runs-on: ubuntu-latest
     needs: [test_ui, test_go, test_windows, golangci, codeql, build_all]
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v2.')
     steps:
-      - uses: actions/checkout@v3
-      - uses: prometheus/promci@v0.1.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
       - uses: ./.github/promci/actions/publish_release
         with:
           docker_hub_login: ${{ secrets.docker_hub_login }}
@@ -192,14 +194,14 @@ jobs:
     needs: [test_ui, codeql]
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
-      - uses: prometheus/promci@v0.1.0
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: prometheus/promci@3cb0c3871f223bd5ce1226995bd52ffb314798b6 # v0.1.0
       - name: Install nodejs
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d # v3.8.1
         with:
           node-version-file: "web/ui/.nvmrc"
           registry-url: "https://registry.npmjs.org"
-      - uses: actions/cache@v3.3.1
+      - uses: actions/cache@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8 # v3.3.1
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}

.github/workflows/codeql-analysis.yml

@@ -6,6 +6,10 @@ on:
   schedule:
     - cron: "26 14 * * 1"
 
+permissions:
+  contents: read
+  security-events: write
+
 jobs:
   analyze:
     name: Analyze
@@ -20,18 +24,18 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
-      - uses: actions/setup-go@v4
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe # v4.1.0
         with:
-          go-version: '>=1.20 <1.21'
+          go-version: 1.21.x
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v2
+        uses: github/codeql-action/init@407ffafae6a767df3e0230c3df91b6443ae8df75 # v2.22.8
         with:
           languages: ${{ matrix.language }}
 
       - name: Autobuild
-        uses: github/codeql-action/autobuild@v2
+        uses: github/codeql-action/autobuild@407ffafae6a767df3e0230c3df91b6443ae8df75 # v2.22.8
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@v2
+        uses: github/codeql-action/analyze@407ffafae6a767df3e0230c3df91b6443ae8df75 # v2.22.8

.github/workflows/funcbench.yml

@@ -2,6 +2,9 @@ on:
   repository_dispatch:
     types: [funcbench_start]
 name: Funcbench Workflow
+permissions:
+  contents: read
+
 jobs:
   run_funcbench:
     name: Running funcbench

.github/workflows/fuzzing.yml

@@ -1,6 +1,9 @@
 name: CIFuzz
 on:
   workflow_call:
+permissions:
+  contents: read
+
 jobs:
   Fuzzing:
     runs-on: ubuntu-latest
@@ -18,7 +21,7 @@ jobs:
           fuzz-seconds: 600
           dry-run: false
       - name: Upload Crash
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
         if: failure() && steps.build.outcome == 'success'
         with:
           name: artifacts

.github/workflows/lock.yml

@@ -14,8 +14,9 @@ concurrency:
 jobs:
   action:
     runs-on: ubuntu-latest
+    if: github.repository_owner == 'prometheus'
     steps:
-      - uses: dessant/lock-threads@v4
+      - uses: dessant/lock-threads@1bf7ec25051fe7c00bdd17e6a7cf3d7bfb7dc771 # v5.0.1
         with:
           process-only: 'issues'
           issue-inactive-days: '180'

.github/workflows/repo_sync.yml

@@ -3,13 +3,17 @@ name: Sync repo files
 on:
   schedule:
     - cron: '44 17 * * *'
+permissions:
+  contents: read
+
 jobs:
   repo_sync:
     runs-on: ubuntu-latest
+    if: github.repository_owner == 'prometheus'
     container:
       image: quay.io/prometheus/golang-builder
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - run: ./scripts/sync_repo_files.sh
         env:
           GITHUB_TOKEN: ${{ secrets.PROMBOT_GITHUB_TOKEN }}

.github/workflows/scorecards.yml

@@ -0,0 +1,50 @@
+# Copyright 2022 Google LLC
+
+name: Scorecards supply-chain security
+on:
+  pull_request:
+  push:
+    branches: [ "main" ]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecards analysis
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Used to receive a badge.
+      id-token: write
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # tag=v4.1.1
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@0864cf19026789058feabb7e87baa5f140aac736 # tag=v2.3.1
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # Publish the results for public repositories to enable scorecard badges. For more details, see
+          # https://github.com/ossf/scorecard-action#publishing-results.
+          publish_results: ${{ github.event_name != 'pull_request' }}
+
+      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
+      # format to the repository Actions tab.
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # tag=v3.1.3
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard.
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@407ffafae6a767df3e0230c3df91b6443ae8df75 # tag=v2.22.8
+        with:
+          sarif_file: results.sarif

.golangci.yml

@@ -3,6 +3,10 @@ run:
   skip-files:
     # Skip autogenerated files.
     - ^.*\.(pb|y)\.go$
+  skip-dirs:
+    # Copied it from a different source
+    - storage/remote/otlptranslator/prometheusremotewrite
+    - storage/remote/otlptranslator/prometheus
 
 output:
   sort-results: true
@@ -10,11 +14,16 @@ output:
 linters:
   enable:
     - depguard
+    - errorlint
     - gocritic
+    - godot
     - gofumpt
     - goimports
-    - revive
     - misspell
+    - nolintlint
+    - predeclared
+    - revive
+    - testifylint
     - unconvert
     - unused
 
@@ -27,17 +36,30 @@ issues:
     - path: _test.go
       linters:
         - errcheck
+    - path: "tsdb/head_wal.go"
+      linters:
+        - errorlint
+    - linters:
+        - godot
+      source: "^// ==="
 
 linters-settings:
   depguard:
-    list-type: blacklist
-    include-go-root: true
-    packages-with-error-message:
-      - sync/atomic: "Use go.uber.org/atomic instead of sync/atomic"
-      - github.com/stretchr/testify/assert: "Use github.com/stretchr/testify/require instead of github.com/stretchr/testify/assert"
-      - github.com/go-kit/kit/log: "Use github.com/go-kit/log instead of github.com/go-kit/kit/log"
-      - io/ioutil: "Use corresponding 'os' or 'io' functions instead."
-      - regexp: "Use github.com/grafana/regexp instead of regexp"
+    rules:
+      main:
+        deny:
+        - pkg: "sync/atomic"
+          desc: "Use go.uber.org/atomic instead of sync/atomic"
+        - pkg: "github.com/stretchr/testify/assert"
+          desc: "Use github.com/stretchr/testify/require instead of github.com/stretchr/testify/assert"
+        - pkg: "github.com/go-kit/kit/log"
+          desc: "Use github.com/go-kit/log instead of github.com/go-kit/kit/log"
+        - pkg: "io/ioutil"
+          desc: "Use corresponding 'os' or 'io' functions instead."
+        - pkg: "regexp"
+          desc: "Use github.com/grafana/regexp instead of regexp"
+        - pkg: "github.com/pkg/errors"
+          desc: "Use 'errors' or 'fmt' instead of github.com/pkg/errors"
   errcheck:
     exclude-functions:
       # Don't flag lines such as "io.Copy(io.Discard, resp.Body)".
@@ -55,3 +77,56 @@ linters-settings:
     local-prefixes: github.com/prometheus/prometheus
   gofumpt:
     extra-rules: true
+  revive:
+    # By default, revive will enable only the linting rules that are named in the configuration file.
+    # So, it's needed to explicitly set in configuration all required rules.
+    # The following configuration enables all the rules from the defaults.toml
+    # https://github.com/mgechev/revive/blob/master/defaults.toml
+    rules:
+      # https://github.com/mgechev/revive/blob/master/RULES_DESCRIPTIONS.md
+      - name: blank-imports
+      - name: context-as-argument
+        arguments:
+          # allow functions with test or bench signatures
+          - allowTypesBefore: "*testing.T,testing.TB"
+      - name: context-keys-type
+      - name: dot-imports
+      # A lot of false positives: incorrectly identifies channel draining as "empty code block".
+      # See https://github.com/mgechev/revive/issues/386
+      - name: empty-block
+        disabled: true
+      - name: error-naming
+      - name: error-return
+      - name: error-strings
+      - name: errorf
+      - name: exported
+      - name: increment-decrement
+      - name: indent-error-flow
+      - name: package-comments
+      - name: range
+      - name: receiver-naming
+      - name: redefines-builtin-id
+      - name: superfluous-else
+      - name: time-naming
+      - name: unexported-return
+      - name: unreachable-code
+      - name: unused-parameter
+        disabled: true
+      - name: var-declaration
+      - name: var-naming
+  testifylint:
+    disable:
+      - float-compare
+      - go-require
+    enable:
+      - bool-compare
+      - compares
+      - empty
+      - error-is-as
+      - error-nil
+      - expected-actual
+      - len
+      - require-error
+      - suite-dont-use-pkg
+      - suite-extra-assert-call
+ 

.promu.yml

@@ -1,7 +1,7 @@
 go:
     # Whenever the Go version is updated here,
     # .circle/config.yml should also be updated.
-    version: 1.20
+    version: 1.21
 repository:
     path: github.com/prometheus/prometheus
 build:
@@ -14,9 +14,10 @@ build:
         all:
             - netgo
             - builtinassets
+            - stringlabels
         windows:
             - builtinassets
-    flags: -a
+            - stringlabels
     ldflags: |
         -X github.com/prometheus/common/version.Version={{.Version}}
         -X github.com/prometheus/common/version.Revision={{.Revision}}

.yamllint

@@ -20,5 +20,4 @@ rules:
       config/testdata/section_key_dup.bad.yml
   line-length: disable
   truthy:
-    ignore: |
-      .github/workflows/*.yml
+    check-keys: false

CHANGELOG.md

@@ -1,5 +1,139 @@
 # Changelog
 
+## unreleased
+
+* [ENHANCEMENT] TSDB: Make the wlog watcher read segments synchronously when not tailing. #13224
+* [BUGFIX] Agent: Participate in notify calls. #13223
+
+## 2.48.0 / 2023-11-16
+
+* [CHANGE] Remote-write: respect Retry-After header on 5xx errors. #12677
+* [FEATURE] Alerting: Add AWS SigV4 authentication support for Alertmanager endpoints. #12774
+* [FEATURE] Promtool: Add support for histograms in the TSDB dump command. #12775
+* [FEATURE] PromQL: Add warnings (and annotations) to PromQL query results. #12152 #12982 #12988 #13012
+* [FEATURE] Remote-write: Add Azure AD OAuth authentication support for remote write requests. #12572
+* [ENHANCEMENT] Remote-write: Add a header to count retried remote write requests. #12729
+* [ENHANCEMENT] TSDB: Improve query performance by re-using iterator when moving between series. #12757
+* [ENHANCEMENT] UI: Move /targets page discovered labels to expandable section #12824
+* [ENHANCEMENT] TSDB: Optimize WBL loading by not sending empty buffers over channel. #12808
+* [ENHANCEMENT] TSDB: Reply WBL mmap markers concurrently. #12801
+* [ENHANCEMENT] Promtool: Add support for specifying series matchers in the TSDB analyze command. #12842
+* [ENHANCEMENT] PromQL: Prevent Prometheus from overallocating memory on subquery with large amount of steps. #12734
+* [ENHANCEMENT] PromQL: Add warning when monotonicity is forced in the input to histogram_quantile. #12931
+* [ENHANCEMENT] Scraping: Optimize sample appending by reducing garbage. #12939
+* [ENHANCEMENT] Storage: Reduce memory allocations in queries that merge series sets. #12938
+* [ENHANCEMENT] UI: Show group interval in rules display. #12943
+* [ENHANCEMENT] Scraping: Save memory when scraping by delaying creation of buffer. #12953
+* [ENHANCEMENT] Agent: Allow ingestion of out-of-order samples. #12897
+* [ENHANCEMENT] Promtool: Improve support for native histograms in TSDB analyze command. #12869
+* [ENHANCEMENT] Scraping: Add configuration option for tracking staleness of scraped timestamps. #13060
+* [BUGFIX] SD: Ensure that discovery managers are properly canceled. #10569
+* [BUGFIX] TSDB: Fix PostingsForMatchers race with creating new series. #12558
+* [BUGFIX] TSDB: Fix handling of explicit counter reset header in histograms. #12772
+* [BUGFIX] SD: Validate HTTP client configuration in HTTP, EC2, Azure, Uyuni, PuppetDB, and Lightsail SDs. #12762 #12811 #12812 #12815 #12814 #12816
+* [BUGFIX] TSDB: Fix counter reset edgecases causing native histogram panics. #12838
+* [BUGFIX] TSDB: Fix duplicate sample detection at chunk size limit. #12874
+* [BUGFIX] Promtool: Fix errors not being reported in check rules command. #12715
+* [BUGFIX] TSDB: Avoid panics reported in logs when head initialization takes a long time. #12876
+* [BUGFIX] TSDB: Ensure that WBL is repaired when possible. #12406
+* [BUGFIX] Storage: Fix crash caused by incorrect mixed samples handling. #13055
+* [BUGFIX] TSDB: Fix compactor failures by adding min time to histogram chunks. #13062
+
+## 2.47.1 / 2023-10-04
+
+* [BUGFIX] Fix duplicate sample detection at chunk size limit #12874
+
+## 2.47.0 / 2023-09-06
+
+This release adds an experimental OpenTelemetry (OTLP) Ingestion feature,
+and also new setting `keep_dropped_targets` to limit the amount of dropped
+targets held in memory. This defaults to 0 meaning 'no limit', so we encourage
+users with large Prometheus to try setting a limit such as 100.
+
+* [FEATURE] Web: Add OpenTelemetry (OTLP) Ingestion endpoint. #12571 #12643
+* [FEATURE] Scraping: Optionally limit detail on dropped targets, to save memory. #12647
+* [ENHANCEMENT] TSDB: Write head chunks to disk in the background to reduce blocking. #11818
+* [ENHANCEMENT] PromQL: Speed up aggregate and function queries. #12682
+* [ENHANCEMENT] PromQL: More efficient evaluation of query with `timestamp()`. #12579
+* [ENHANCEMENT] API: Faster streaming of Labels to JSON. #12598
+* [ENHANCEMENT] Agent: Memory pooling optimisation. #12651
+* [ENHANCEMENT] TSDB: Prevent storage space leaks due to terminated snapshots on shutdown. #12664
+* [ENHANCEMENT] Histograms: Refactoring and optimisations. #12352 #12584 #12596 #12711 #12054
+* [ENHANCEMENT] Histograms: Add `histogram_stdvar` and `histogram_stddev` functions. #12614
+* [ENHANCEMENT] Remote-write: add http.resend_count tracing attribute. #12676
+* [ENHANCEMENT] TSDB: Support native histograms in snapshot on shutdown. #12722
+* [BUGFIX] TSDB/Agent: ensure that new series get written to WAL on rollback. #12592
+* [BUGFIX] Scraping: fix infinite loop on exemplar in protobuf format. #12737
+
+## 2.46.0 / 2023-07-25
+
+* [FEATURE] Promtool: Add PromQL format and label matcher set/delete commands to promtool. #11411
+* [FEATURE] Promtool: Add push metrics command. #12299
+* [ENHANCEMENT] Promtool: Read from stdin if no filenames are provided in check rules. #12225
+* [ENHANCEMENT] Hetzner SD: Support larger ID's that will be used by Hetzner in September. #12569
+* [ENHANCEMENT] Kubernetes SD: Add more labels for endpointslice and endpoints role. #10914
+* [ENHANCEMENT] Kubernetes SD: Do not add pods to target group if the PodIP status is not set. #11642
+* [ENHANCEMENT] OpenStack SD: Include instance image ID in labels. #12502
+* [ENHANCEMENT] Remote Write receiver: Validate the metric names and labels. #11688
+* [ENHANCEMENT] Web: Initialize `prometheus_http_requests_total` metrics with `code` label set to `200`. #12472
+* [ENHANCEMENT] TSDB: Add Zstandard compression option for wlog. #11666
+* [ENHANCEMENT] TSDB: Support native histograms in snapshot on shutdown. #12258
+* [ENHANCEMENT] Labels: Avoid compiling regexes that are literal. #12434
+* [BUGFIX] Histograms: Fix parsing of float histograms without zero bucket. #12577
+* [BUGFIX] Histograms: Fix scraping native and classic histograms missing some histograms. #12554
+* [BUGFIX] Histograms: Enable ingestion of multiple exemplars per sample. 12557
+* [BUGFIX] File SD: Fix path handling in File-SD watcher to allow directory monitoring on Windows. #12488
+* [BUGFIX] Linode SD: Cast `InstanceSpec` values to `int64` to avoid overflows on 386 architecture. #12568
+* [BUGFIX] PromQL Engine: Include query parsing in active-query tracking. #12418
+* [BUGFIX] TSDB: Handle TOC parsing failures. #10623
+
+## 2.45.0 / 2023-06-23
+
+This release is a LTS (Long-Term Support) release of Prometheus and will
+receive security, documentation and bugfix patches for at least 12 months.
+Please read more about our LTS release cycle at
+<https://prometheus.io/docs/introduction/release-cycle/>.
+
+* [FEATURE] API: New limit parameter to limit the number of items returned by `/api/v1/status/tsdb` endpoint. #12336
+* [FEATURE] Config: Add limits to global config. #12126
+* [FEATURE] Consul SD: Added support for `path_prefix`. #12372
+* [FEATURE] Native histograms: Add option to scrape both classic and native histograms. #12350
+* [FEATURE] Native histograms: Added support for two more arithmetic operators `avg_over_time` and `sum_over_time`. #12262
+* [FEATURE] Promtool: When providing the block id, only one block will be loaded and analyzed. #12031
+* [FEATURE] Remote-write: New Azure ad configuration to support remote writing directly to Azure Monitor workspace. #11944
+* [FEATURE] TSDB: Samples per chunk are now configurable with flag `storage.tsdb.samples-per-chunk`. By default set to its former value 120. #12055
+* [ENHANCEMENT] Native histograms: bucket size can now be limited to avoid scrape fails. #12254
+* [ENHANCEMENT] TSDB: Dropped series are now deleted from the WAL sooner. #12297
+* [BUGFIX] Native histograms: ChunkSeries iterator now checks if a new sample can be appended to the open chunk. #12185
+* [BUGFIX] Native histograms: Fix Histogram Appender `Appendable()` segfault. #12357
+* [BUGFIX] Native histograms: Fix setting reset header to gauge histograms in seriesToChunkEncoder. #12329
+* [BUGFIX] TSDB: Tombstone intervals are not modified after Get() call. #12245
+* [BUGFIX] TSDB: Use path/filepath to set the WAL directory. #12349
+
+## 2.44.0 / 2023-05-13
+
+This version is built with Go tag `stringlabels`, to use the smaller data
+structure for Labels that was optional in the previous release. For more
+details about this code change see #10991.
+
+* [CHANGE] Remote-write: Raise default samples per send to 2,000. #12203
+* [FEATURE] Remote-read: Handle native histograms. #12085, #12192
+* [FEATURE] Promtool: Health and readiness check of prometheus server in CLI. #12096
+* [FEATURE] PromQL: Add `query_samples_total` metric, the total number of samples loaded by all queries. #12251
+* [ENHANCEMENT] Storage: Optimise buffer used to iterate through samples. #12326
+* [ENHANCEMENT] Scrape: Reduce memory allocations on target labels. #12084
+* [ENHANCEMENT] PromQL: Use faster heap method for `topk()` / `bottomk()`. #12190
+* [ENHANCEMENT] Rules API: Allow filtering by rule name. #12270
+* [ENHANCEMENT] Native Histograms: Various fixes and improvements. #11687, #12264, #12272
+* [ENHANCEMENT] UI: Search of scraping pools is now case-insensitive. #12207
+* [ENHANCEMENT] TSDB: Add an affirmative log message for successful WAL repair. #12135
+* [BUGFIX] TSDB: Block compaction failed when shutting down. #12179
+* [BUGFIX] TSDB: Out-of-order chunks could be ignored if the write-behind log was deleted. #12127
+
+## 2.43.1 / 2023-05-03
+
+* [BUGFIX] Labels: `Set()` after `Del()` would be ignored, which broke some relabeling rules. #12322
+
 ## 2.43.0 / 2023-03-21
 
 We are working on some performance improvements in Prometheus, which are only
@@ -13,9 +147,9 @@ the gains on their production architecture. We are providing release artefacts
 improvements for testing. #10991
 
 * [FEATURE] Promtool: Add HTTP client configuration to query commands. #11487
-* [FEATURE] Scrape: Add `include_scrape_configs` to include scrape configs from different files. #12019
+* [FEATURE] Scrape: Add `scrape_config_files` to include scrape configs from different files. #12019
 * [FEATURE] HTTP client: Add `no_proxy` to exclude URLs from proxied requests. #12098
-* [FEATURE] HTTP client: Add `proxy_from_enviroment` to read proxies from env variables. #12098
+* [FEATURE] HTTP client: Add `proxy_from_environment` to read proxies from env variables. #12098
 * [ENHANCEMENT] API: Add support for setting lookback delta per query via the API. #12088
 * [ENHANCEMENT] API: Change HTTP status code from 503/422 to 499 if a request is canceled. #11897
 * [ENHANCEMENT] Scrape: Allow exemplars for all metric types. #11984

CONTRIBUTING.md

@@ -85,7 +85,7 @@ The PromQL parser grammar is located in `promql/parser/generated_parser.y` and i
 The parser is built using [goyacc](https://pkg.go.dev/golang.org/x/tools/cmd/goyacc)
 
 If doing some sort of debugging, then it is possible to add some verbose output. After generating the parser, then you
-can modify the the `./promql/parser/generated_parser.y.go` manually.
+can modify the `./promql/parser/generated_parser.y.go` manually.
 
 ```golang
 // As of writing this was somewhere around line 600.

MAINTAINERS.md

@@ -7,7 +7,7 @@ Julien Pivotto (<roidelapluie@prometheus.io> / @roidelapluie) and Levi Harrison
 * `discovery`
   * `k8s`: Frederic Branczyk (<fbranczyk@gmail.com> / @brancz)
 * `documentation`
-  * `prometheus-mixin`: Björn Rabenstein (<beorn@grafana.com> / @beorn7)
+  * `prometheus-mixin`: Matthias Loibl (<mail@matthiasloibl.com> / @metalmatze)
 * `storage`
   * `remote`: Chris Marchbanks (<csmarchbanks@gmail.com> / @csmarchbanks), Callum Styan (<callumstyan@gmail.com> / @cstyan), Bartłomiej Płotka (<bwplotka@gmail.com> / @bwplotka), Tom Wilkie (<tom.wilkie@gmail.com> / @tomwilkie)
 * `tsdb`: Ganesh Vernekar (<ganesh@grafana.com> / @codesome), Bartłomiej Płotka (<bwplotka@gmail.com> / @bwplotka), Jesús Vázquez (<jesus.vazquez@grafana.com> / @jesusvazquez)

Makefile

@@ -82,7 +82,7 @@ assets-tarball: assets
 .PHONY: parser
 parser:
 	@echo ">> running goyacc to generate the .go file."
-ifeq (, $(shell which goyacc))
+ifeq (, $(shell command -v goyacc > /dev/null))
 	@echo "goyacc not installed so skipping"
 	@echo "To install: go install golang.org/x/tools/cmd/goyacc@v0.6.0"
 else
@@ -93,9 +93,9 @@ endif
 # If we only want to only test go code we have to change the test target
 # which is called by all.
 ifeq ($(GO_ONLY),1)
-test: common-test
+test: common-test check-go-mod-version
 else
-test: common-test ui-build-module ui-test ui-lint
+test: common-test ui-build-module ui-test ui-lint check-go-mod-version
 endif
 
 .PHONY: npm_licenses
@@ -138,3 +138,17 @@ bench_tsdb: $(PROMU)
 cli-documentation:
 	$(GO) run ./cmd/prometheus/ --write-documentation > docs/command-line/prometheus.md
 	$(GO) run ./cmd/promtool/ write-documentation > docs/command-line/promtool.md
+
+.PHONY: check-go-mod-version
+check-go-mod-version:
+	@echo ">> checking go.mod version matching"
+	@./scripts/check-go-mod-version.sh
+
+.PHONY: update-all-go-deps
+update-all-go-deps:
+	@$(MAKE) update-go-deps
+	@echo ">> updating Go dependencies in ./documentation/examples/remote_storage/"
+	@cd ./documentation/examples/remote_storage/ && for m in $$($(GO) list -mod=readonly -m -f '{{ if and (not .Indirect) (not .Main)}}{{.Path}}{{end}}' all); do \
+		$(GO) get -d $$m; \
+	done
+	@cd ./documentation/examples/remote_storage/ && $(GO) mod tidy

Makefile.common

@@ -49,19 +49,19 @@ endif
 GOTEST := $(GO) test
 GOTEST_DIR :=
 ifneq ($(CIRCLE_JOB),)
-ifneq ($(shell which gotestsum),)
+ifneq ($(shell command -v gotestsum > /dev/null),)
 	GOTEST_DIR := test-results
 	GOTEST := gotestsum --junitfile $(GOTEST_DIR)/unit-tests.xml --
 endif
 endif
 
-PROMU_VERSION ?= 0.14.0
+PROMU_VERSION ?= 0.15.0
 PROMU_URL     := https://github.com/prometheus/promu/releases/download/v$(PROMU_VERSION)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM).tar.gz
 
 SKIP_GOLANGCI_LINT :=
 GOLANGCI_LINT :=
 GOLANGCI_LINT_OPTS ?=
-GOLANGCI_LINT_VERSION ?= v1.51.2
+GOLANGCI_LINT_VERSION ?= v1.55.2
 # golangci-lint only supports linux, darwin and windows platforms on i386/amd64.
 # windows isn't included here because of the path separator being different.
 ifeq ($(GOHOSTOS),$(filter $(GOHOSTOS),linux darwin))
@@ -178,7 +178,7 @@ endif
 .PHONY: common-yamllint
 common-yamllint:
 	@echo ">> running yamllint on all YAML files in the repository"
-ifeq (, $(shell which yamllint))
+ifeq (, $(shell command -v yamllint > /dev/null))
 	@echo "yamllint not installed so skipping"
 else
 	yamllint .

README.md

@@ -14,6 +14,7 @@ examples and guides.</p>
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/486/badge)](https://bestpractices.coreinfrastructure.org/projects/486)
 [![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/prometheus/prometheus)
 [![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/prometheus.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:prometheus)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/prometheus/prometheus/badge)](https://api.securityscorecards.dev/projects/github.com/prometheus/prometheus)
 
 </div>
 
@@ -34,7 +35,7 @@ The features that distinguish Prometheus from other metrics and monitoring syste
 
 ## Architecture overview
 
-![Architecture overview](https://cdn.jsdelivr.net/gh/prometheus/prometheus@c34257d069c630685da35bcef084632ffd5d6209/documentation/images/architecture.svg)
+![Architecture overview](documentation/images/architecture.svg)
 
 ## Install
 

RELEASE.md

@@ -49,7 +49,12 @@ Release cadence of first pre-releases being cut is 6 weeks.
 | v2.42          | 2023-01-25                                 | Kemal Akkoyun (GitHub: @kakkoyun)           |
 | v2.43          | 2023-03-08                                 | Julien Pivotto (GitHub: @roidelapluie)      |
 | v2.44          | 2023-04-19                                 | Bryan Boreham (GitHub: @bboreham)           |
-| v2.45          | 2023-05-31                                 | **searching for volunteer**                 |
+| v2.45 LTS      | 2023-05-31                                 | Jesus Vazquez (Github: @jesusvazquez)       |
+| v2.46          | 2023-07-12                                 | Julien Pivotto (GitHub: @roidelapluie)      |
+| v2.47          | 2023-08-23                                 | Bryan Boreham (GitHub: @bboreham)           |
+| v2.48          | 2023-10-04                                 | Levi Harrison (GitHub: @LeviHarrison)       |
+| v2.49          | 2023-12-05                                 | Bartek Plotka (GitHub: @bwplotka)           |
+| v2.50          | 2024-01-16                                 | **searching for volunteer**                 |
 
 If you are interested in volunteering please create a pull request against the [prometheus/prometheus](https://github.com/prometheus/prometheus) repository and propose yourself for the release series of your choice.
 
@@ -104,14 +109,16 @@ This is also a good time to consider any experimental features and feature
 flags for promotion to stable or for deprecation or ultimately removal. Do any
 of these in pull requests, one per feature.
 
+> NOTE: As a validation step check if all security alerts are closed after this step: https://github.com/prometheus/prometheus/security/dependabot. Sometimes it's ok
+> if not critical and e.g. fix is not released yet (or it does not relate to 
+> upgrading) or when we are unaffected.
+ 
 #### Manually updating Go dependencies
 
 This is usually only needed for `+incompatible` and `v0.0.0` non-semver updates.
 
 ```bash
-make update-go-deps
-git add go.mod go.sum
-git commit -m "Update dependencies"
+make update-all-go-deps
 ```
 
 #### Manually updating React dependencies

VERSION

@@ -1 +1 @@
-2.43.0
+2.48.0

cmd/prometheus/main.go

@@ -12,7 +12,6 @@
 // limitations under the License.
 
 // The main package for the Prometheus server executable.
-// nolint:revive // Many unsued function arguments in this file by design.
 package main
 
 import (
@@ -64,6 +63,7 @@ import (
 	"github.com/prometheus/prometheus/notifier"
 	_ "github.com/prometheus/prometheus/plugins" // Register plugins.
 	"github.com/prometheus/prometheus/promql"
+	"github.com/prometheus/prometheus/promql/parser"
 	"github.com/prometheus/prometheus/rules"
 	"github.com/prometheus/prometheus/scrape"
 	"github.com/prometheus/prometheus/storage"
@@ -71,6 +71,7 @@ import (
 	"github.com/prometheus/prometheus/tracing"
 	"github.com/prometheus/prometheus/tsdb"
 	"github.com/prometheus/prometheus/tsdb/agent"
+	"github.com/prometheus/prometheus/tsdb/wlog"
 	"github.com/prometheus/prometheus/util/documentcli"
 	"github.com/prometheus/prometheus/util/logging"
 	prom_runtime "github.com/prometheus/prometheus/util/runtime"
@@ -169,6 +170,9 @@ func (c *flagConfig) setFeatureListOptions(logger log.Logger) error {
 			case "remote-write-receiver":
 				c.web.EnableRemoteWriteReceiver = true
 				level.Warn(logger).Log("msg", "Remote write receiver enabled via feature flag remote-write-receiver. This is DEPRECATED. Use --web.enable-remote-write-receiver.")
+			case "otlp-write-receiver":
+				c.web.EnableOTLPWriteReceiver = true
+				level.Info(logger).Log("msg", "Experimental OTLP write receiver enabled")
 			case "expand-external-labels":
 				c.enableExpandExternalLabels = true
 				level.Info(logger).Log("msg", "Experimental expand-external-labels enabled")
@@ -199,10 +203,21 @@ func (c *flagConfig) setFeatureListOptions(logger log.Logger) error {
 			case "no-default-scrape-port":
 				c.scrape.NoDefaultPort = true
 				level.Info(logger).Log("msg", "No default port will be appended to scrape targets' addresses.")
+			case "promql-experimental-functions":
+				parser.EnableExperimentalFunctions = true
+				level.Info(logger).Log("msg", "Experimental PromQL functions enabled.")
 			case "native-histograms":
 				c.tsdb.EnableNativeHistograms = true
-				c.scrape.EnableProtobufNegotiation = true
-				level.Info(logger).Log("msg", "Experimental native histogram support enabled.")
+				// Change relevant global variables. Hacky, but it's hard to pass a new option or default to unmarshallers.
+				config.DefaultConfig.GlobalConfig.ScrapeProtocols = config.DefaultProtoFirstScrapeProtocols
+				config.DefaultGlobalConfig.ScrapeProtocols = config.DefaultProtoFirstScrapeProtocols
+				level.Info(logger).Log("msg", "Experimental native histogram support enabled. Changed default scrape_protocols to prefer PrometheusProto format.", "global.scrape_protocols", fmt.Sprintf("%v", config.DefaultGlobalConfig.ScrapeProtocols))
+			case "created-timestamp-zero-ingestion":
+				c.scrape.EnableCreatedTimestampZeroIngestion = true
+				// Change relevant global variables. Hacky, but it's hard to pass a new option or default to unmarshallers.
+				config.DefaultConfig.GlobalConfig.ScrapeProtocols = config.DefaultProtoFirstScrapeProtocols
+				config.DefaultGlobalConfig.ScrapeProtocols = config.DefaultProtoFirstScrapeProtocols
+				level.Info(logger).Log("msg", "Experimental created timestamp zero ingestion enabled. Changed default scrape_protocols to prefer PrometheusProto format.", "global.scrape_protocols", fmt.Sprintf("%v", config.DefaultGlobalConfig.ScrapeProtocols))
 			case "":
 				continue
 			case "promql-at-modifier", "promql-negative-offset":
@@ -213,11 +228,6 @@ func (c *flagConfig) setFeatureListOptions(logger log.Logger) error {
 		}
 	}
 
-	if c.tsdb.EnableNativeHistograms && c.tsdb.EnableMemorySnapshotOnShutdown {
-		c.tsdb.EnableMemorySnapshotOnShutdown = false
-		level.Warn(logger).Log("msg", "memory-snapshot-on-shutdown has been disabled automatically because memory-snapshot-on-shutdown and native-histograms cannot be enabled at the same time.")
-	}
-
 	return nil
 }
 
@@ -337,9 +347,15 @@ func main() {
 	serverOnlyFlag(a, "storage.tsdb.wal-compression", "Compress the tsdb WAL.").
 		Hidden().Default("true").BoolVar(&cfg.tsdb.WALCompression)
 
+	serverOnlyFlag(a, "storage.tsdb.wal-compression-type", "Compression algorithm for the tsdb WAL.").
+		Hidden().Default(string(wlog.CompressionSnappy)).EnumVar(&cfg.tsdb.WALCompressionType, string(wlog.CompressionSnappy), string(wlog.CompressionZstd))
+
 	serverOnlyFlag(a, "storage.tsdb.head-chunks-write-queue-size", "Size of the queue through which head chunks are written to the disk to be m-mapped, 0 disables the queue completely. Experimental.").
 		Default("0").IntVar(&cfg.tsdb.HeadChunksWriteQueueSize)
 
+	serverOnlyFlag(a, "storage.tsdb.samples-per-chunk", "Target number of samples per chunk.").
+		Default("120").Hidden().IntVar(&cfg.tsdb.SamplesPerChunk)
+
 	agentOnlyFlag(a, "storage.agent.path", "Base path for metrics storage.").
 		Default("data-agent/").StringVar(&cfg.agentStoragePath)
 
@@ -350,6 +366,9 @@ func main() {
 	agentOnlyFlag(a, "storage.agent.wal-compression", "Compress the agent WAL.").
 		Default("true").BoolVar(&cfg.agent.WALCompression)
 
+	agentOnlyFlag(a, "storage.agent.wal-compression-type", "Compression algorithm for the agent WAL.").
+		Hidden().Default(string(wlog.CompressionSnappy)).EnumVar(&cfg.agent.WALCompressionType, string(wlog.CompressionSnappy), string(wlog.CompressionZstd))
+
 	agentOnlyFlag(a, "storage.agent.wal-truncate-frequency",
 		"The frequency at which to truncate the WAL and remove old data.").
 		Hidden().PlaceHolder("<duration>").SetValue(&cfg.agent.TruncateFrequency)
@@ -413,7 +432,7 @@ func main() {
 	a.Flag("scrape.discovery-reload-interval", "Interval used by scrape manager to throttle target groups updates.").
 		Hidden().Default("5s").SetValue(&cfg.scrape.DiscoveryReloadInterval)
 
-	a.Flag("enable-feature", "Comma separated feature names to enable. Valid options: agent, exemplar-storage, expand-external-labels, memory-snapshot-on-shutdown, promql-at-modifier, promql-negative-offset, promql-per-step-stats, remote-write-receiver (DEPRECATED), extra-scrape-metrics, new-service-discovery-manager, auto-gomaxprocs, no-default-scrape-port, native-histograms, metadata-storage. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details.").
+	a.Flag("enable-feature", "Comma separated feature names to enable. Valid options: agent, exemplar-storage, expand-external-labels, memory-snapshot-on-shutdown, promql-at-modifier, promql-negative-offset, promql-per-step-stats, promql-experimental-functions, remote-write-receiver (DEPRECATED), extra-scrape-metrics, new-service-discovery-manager, auto-gomaxprocs, no-default-scrape-port, native-histograms, otlp-write-receiver, metadata-storage. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details.").
 		Default("").StringsVar(&cfg.featureList)
 
 	promlogflag.AddFlags(a, &cfg.promlogConfig)
@@ -429,7 +448,7 @@ func main() {
 
 	_, err := a.Parse(os.Args[1:])
 	if err != nil {
-		fmt.Fprintln(os.Stderr, fmt.Errorf("Error parsing commandline arguments: %w", err))
+		fmt.Fprintln(os.Stderr, fmt.Errorf("Error parsing command line arguments: %w", err))
 		a.Usage(os.Args[1:])
 		os.Exit(2)
 	}
@@ -610,18 +629,66 @@ func main() {
 		discoveryManagerNotify  discoveryManager
 	)
 
+	// Kubernetes client metrics are used by Kubernetes SD.
+	// They are registered here in the main function, because SD mechanisms
+	// can only register metrics specific to a SD instance.
+	// Kubernetes client metrics are the same for the whole process -
+	// they are not specific to an SD instance.
+	err = discovery.RegisterK8sClientMetricsWithPrometheus(prometheus.DefaultRegisterer)
+	if err != nil {
+		level.Error(logger).Log("msg", "failed to register Kubernetes client metrics", "err", err)
+		os.Exit(1)
+	}
 	if cfg.enableNewSDManager {
-		discovery.RegisterMetrics()
-		discoveryManagerScrape = discovery.NewManager(ctxScrape, log.With(logger, "component", "discovery manager scrape"), discovery.Name("scrape"))
-		discoveryManagerNotify = discovery.NewManager(ctxNotify, log.With(logger, "component", "discovery manager notify"), discovery.Name("notify"))
+		{
+			discMgr := discovery.NewManager(ctxScrape, log.With(logger, "component", "discovery manager scrape"), prometheus.DefaultRegisterer, discovery.Name("scrape"))
+			if discMgr == nil {
+				level.Error(logger).Log("msg", "failed to create a discovery manager scrape")
+				os.Exit(1)
+			}
+			discoveryManagerScrape = discMgr
+		}
+
+		{
+			discMgr := discovery.NewManager(ctxNotify, log.With(logger, "component", "discovery manager notify"), prometheus.DefaultRegisterer, discovery.Name("notify"))
+			if discMgr == nil {
+				level.Error(logger).Log("msg", "failed to create a discovery manager notify")
+				os.Exit(1)
+			}
+			discoveryManagerNotify = discMgr
+		}
 	} else {
-		legacymanager.RegisterMetrics()
-		discoveryManagerScrape = legacymanager.NewManager(ctxScrape, log.With(logger, "component", "discovery manager scrape"), legacymanager.Name("scrape"))
-		discoveryManagerNotify = legacymanager.NewManager(ctxNotify, log.With(logger, "component", "discovery manager notify"), legacymanager.Name("notify"))
+		{
+			discMgr := legacymanager.NewManager(ctxScrape, log.With(logger, "component", "discovery manager scrape"), prometheus.DefaultRegisterer, legacymanager.Name("scrape"))
+			if discMgr == nil {
+				level.Error(logger).Log("msg", "failed to create a discovery manager scrape")
+				os.Exit(1)
+			}
+			discoveryManagerScrape = discMgr
+		}
+
+		{
+			discMgr := legacymanager.NewManager(ctxNotify, log.With(logger, "component", "discovery manager notify"), prometheus.DefaultRegisterer, legacymanager.Name("notify"))
+			if discMgr == nil {
+				level.Error(logger).Log("msg", "failed to create a discovery manager notify")
+				os.Exit(1)
+			}
+			discoveryManagerNotify = discMgr
+		}
+	}
+
+	scrapeManager, err := scrape.NewManager(
+		&cfg.scrape,
+		log.With(logger, "component", "scrape manager"),
+		fanoutStorage,
+		prometheus.DefaultRegisterer,
+	)
+	if err != nil {
+		level.Error(logger).Log("msg", "failed to create a scrape manager", "err", err)
+		os.Exit(1)
 	}
 
 	var (
-		scrapeManager  = scrape.NewManager(&cfg.scrape, log.With(logger, "component", "scrape manager"), fanoutStorage)
 		tracingManager = tracing.NewManager(logger)
 
 		queryEngine *promql.Engine
@@ -1059,6 +1126,7 @@ func main() {
 
 				startTimeMargin := int64(2 * time.Duration(cfg.tsdb.MinBlockDuration).Seconds() * 1000)
 				localStorage.Set(db, startTimeMargin)
+				db.SetWriteNotified(remoteStorage)
 				close(dbOpen)
 				<-cancel
 				return nil
@@ -1112,6 +1180,7 @@ func main() {
 				)
 
 				localStorage.Set(db, 0)
+				db.SetWriteNotified(remoteStorage)
 				close(dbOpen)
 				<-cancel
 				return nil
@@ -1272,7 +1341,7 @@ func startsOrEndsWithQuote(s string) bool {
 		strings.HasSuffix(s, "\"") || strings.HasSuffix(s, "'")
 }
 
-// compileCORSRegexString compiles given string and adds anchors
+// compileCORSRegexString compiles given string and adds anchors.
 func compileCORSRegexString(s string) (*regexp.Regexp, error) {
 	r, err := relabel.NewRegexp(s)
 	if err != nil {
@@ -1378,17 +1447,17 @@ func (s *readyStorage) StartTime() (int64, error) {
 }
 
 // Querier implements the Storage interface.
-func (s *readyStorage) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error) {
+func (s *readyStorage) Querier(mint, maxt int64) (storage.Querier, error) {
 	if x := s.get(); x != nil {
-		return x.Querier(ctx, mint, maxt)
+		return x.Querier(mint, maxt)
 	}
 	return nil, tsdb.ErrNotReady
 }
 
 // ChunkQuerier implements the Storage interface.
-func (s *readyStorage) ChunkQuerier(ctx context.Context, mint, maxt int64) (storage.ChunkQuerier, error) {
+func (s *readyStorage) ChunkQuerier(mint, maxt int64) (storage.ChunkQuerier, error) {
 	if x := s.get(); x != nil {
-		return x.ChunkQuerier(ctx, mint, maxt)
+		return x.ChunkQuerier(mint, maxt)
 	}
 	return nil, tsdb.ErrNotReady
 }
@@ -1433,6 +1502,10 @@ func (n notReadyAppender) UpdateMetadata(ref storage.SeriesRef, l labels.Labels,
 	return 0, tsdb.ErrNotReady
 }
 
+func (n notReadyAppender) AppendCTZeroSample(ref storage.SeriesRef, l labels.Labels, t, ct int64) (storage.SeriesRef, error) {
+	return 0, tsdb.ErrNotReady
+}
+
 func (n notReadyAppender) Commit() error { return tsdb.ErrNotReady }
 
 func (n notReadyAppender) Rollback() error { return tsdb.ErrNotReady }
@@ -1461,11 +1534,11 @@ func (s *readyStorage) CleanTombstones() error {
 }
 
 // Delete implements the api_v1.TSDBAdminStats and api_v2.TSDBAdmin interfaces.
-func (s *readyStorage) Delete(mint, maxt int64, ms ...*labels.Matcher) error {
+func (s *readyStorage) Delete(ctx context.Context, mint, maxt int64, ms ...*labels.Matcher) error {
 	if x := s.get(); x != nil {
 		switch db := x.(type) {
 		case *tsdb.DB:
-			return db.Delete(mint, maxt, ms...)
+			return db.Delete(ctx, mint, maxt, ms...)
 		case *agent.DB:
 			return agent.ErrUnsupported
 		default:
@@ -1491,11 +1564,11 @@ func (s *readyStorage) Snapshot(dir string, withHead bool) error {
 }
 
 // Stats implements the api_v1.TSDBAdminStats interface.
-func (s *readyStorage) Stats(statsByLabelName string) (*tsdb.Stats, error) {
+func (s *readyStorage) Stats(statsByLabelName string, limit int) (*tsdb.Stats, error) {
 	if x := s.get(); x != nil {
 		switch db := x.(type) {
 		case *tsdb.DB:
-			return db.Head().Stats(statsByLabelName), nil
+			return db.Head().Stats(statsByLabelName, limit), nil
 		case *agent.DB:
 			return nil, agent.ErrUnsupported
 		default:
@@ -1551,7 +1624,9 @@ type tsdbOptions struct {
 	MaxBytes                       units.Base2Bytes
 	NoLockfile                     bool
 	WALCompression                 bool
+	WALCompressionType             string
 	HeadChunksWriteQueueSize       int
+	SamplesPerChunk                int
 	StripeSize                     int
 	MinBlockDuration               model.Duration
 	MaxBlockDuration               model.Duration
@@ -1569,9 +1644,9 @@ func (opts tsdbOptions) ToTSDBOptions() tsdb.Options {
 		RetentionDuration:              int64(time.Duration(opts.RetentionDuration) / time.Millisecond),
 		MaxBytes:                       int64(opts.MaxBytes),
 		NoLockfile:                     opts.NoLockfile,
-		AllowOverlappingCompaction:     true,
-		WALCompression:                 opts.WALCompression,
+		WALCompression:                 wlog.ParseCompressionType(opts.WALCompression, opts.WALCompressionType),
 		HeadChunksWriteQueueSize:       opts.HeadChunksWriteQueueSize,
+		SamplesPerChunk:                opts.SamplesPerChunk,
 		StripeSize:                     opts.StripeSize,
 		MinBlockDuration:               int64(time.Duration(opts.MinBlockDuration) / time.Millisecond),
 		MaxBlockDuration:               int64(time.Duration(opts.MaxBlockDuration) / time.Millisecond),
@@ -1588,6 +1663,7 @@ func (opts tsdbOptions) ToTSDBOptions() tsdb.Options {
 type agentOptions struct {
 	WALSegmentSize         units.Base2Bytes
 	WALCompression         bool
+	WALCompressionType     string
 	StripeSize             int
 	TruncateFrequency      model.Duration
 	MinWALTime, MaxWALTime model.Duration
@@ -1597,7 +1673,7 @@ type agentOptions struct {
 func (opts agentOptions) ToAgentOptions() agent.Options {
 	return agent.Options{
 		WALSegmentSize:    int(opts.WALSegmentSize),
-		WALCompression:    opts.WALCompression,
+		WALCompression:    wlog.ParseCompressionType(opts.WALCompression, opts.WALCompressionType),
 		StripeSize:        opts.StripeSize,
 		TruncateFrequency: time.Duration(opts.TruncateFrequency),
 		MinWALTime:        durationToInt64Millis(time.Duration(opts.MinWALTime)),

cmd/prometheus/main_test.go

@@ -346,7 +346,7 @@ func getCurrentGaugeValuesFor(t *testing.T, reg prometheus.Gatherer, metricNames
 				continue
 			}
 
-			require.Equal(t, 1, len(g.GetMetric()))
+			require.Len(t, g.GetMetric(), 1)
 			if _, ok := res[m]; ok {
 				t.Error("expected only one metric family for", m)
 				t.FailNow()
@@ -498,10 +498,9 @@ func TestDocumentation(t *testing.T) {
 	cmd.Stdout = &stdout
 
 	if err := cmd.Run(); err != nil {
-		if exitError, ok := err.(*exec.ExitError); ok {
-			if exitError.ExitCode() != 0 {
-				fmt.Println("Command failed with non-zero exit code")
-			}
+		var exitError *exec.ExitError
+		if errors.As(err, &exitError) && exitError.ExitCode() != 0 {
+			fmt.Println("Command failed with non-zero exit code")
 		}
 	}
 

cmd/prometheus/query_log_test.go

@@ -284,7 +284,7 @@ func (p *queryLogTest) run(t *testing.T) {
 
 	if !p.enabledAtStart {
 		p.query(t)
-		require.Equal(t, 0, len(readQueryLog(t, queryLogFile.Name())))
+		require.Empty(t, readQueryLog(t, queryLogFile.Name()))
 		p.setQueryLog(t, queryLogFile.Name())
 		p.reloadConfig(t)
 	}
@@ -309,7 +309,7 @@ func (p *queryLogTest) run(t *testing.T) {
 	p.query(t)
 
 	ql = readQueryLog(t, queryLogFile.Name())
-	require.Equal(t, qc, len(ql))
+	require.Len(t, ql, qc)
 
 	qc = len(ql)
 	p.setQueryLog(t, queryLogFile.Name())
@@ -320,7 +320,7 @@ func (p *queryLogTest) run(t *testing.T) {
 
 	ql = readQueryLog(t, queryLogFile.Name())
 	if p.exactQueryCount() {
-		require.Equal(t, qc, len(ql))
+		require.Len(t, ql, qc)
 	} else {
 		require.Greater(t, len(ql), qc, "no queries logged")
 	}
@@ -340,7 +340,7 @@ func (p *queryLogTest) run(t *testing.T) {
 	require.NoError(t, os.Rename(queryLogFile.Name(), newFile.Name()))
 	ql = readQueryLog(t, newFile.Name())
 	if p.exactQueryCount() {
-		require.Equal(t, qc, len(ql))
+		require.Len(t, ql, qc)
 	}
 	p.validateLastQuery(t, ql)
 	qc = len(ql)
@@ -351,7 +351,7 @@ func (p *queryLogTest) run(t *testing.T) {
 
 	ql = readQueryLog(t, newFile.Name())
 	if p.exactQueryCount() {
-		require.Equal(t, qc, len(ql))
+		require.Len(t, ql, qc)
 	} else {
 		require.Greater(t, len(ql), qc, "no queries logged")
 	}

cmd/promtool/backfill_test.go

@@ -44,8 +44,8 @@ func sortSamples(samples []backfillSample) {
 	})
 }
 
-func queryAllSeries(t testing.TB, q storage.Querier, expectedMinTime, expectedMaxTime int64) []backfillSample { // nolint:revive
-	ss := q.Select(false, nil, labels.MustNewMatcher(labels.MatchRegexp, "", ".*"))
+func queryAllSeries(t testing.TB, q storage.Querier, expectedMinTime, expectedMaxTime int64) []backfillSample {
+	ss := q.Select(context.Background(), false, nil, labels.MustNewMatcher(labels.MatchRegexp, "", ".*"))
 	samples := []backfillSample{}
 	for ss.Next() {
 		series := ss.At()
@@ -61,13 +61,13 @@ func queryAllSeries(t testing.TB, q storage.Querier, expectedMinTime, expectedMa
 
 func testBlocks(t *testing.T, db *tsdb.DB, expectedMinTime, expectedMaxTime, expectedBlockDuration int64, expectedSamples []backfillSample, expectedNumBlocks int) {
 	blocks := db.Blocks()
-	require.Equal(t, expectedNumBlocks, len(blocks), "did not create correct number of blocks")
+	require.Len(t, blocks, expectedNumBlocks, "did not create correct number of blocks")
 
 	for i, block := range blocks {
 		require.Equal(t, block.MinTime()/expectedBlockDuration, (block.MaxTime()-1)/expectedBlockDuration, "block %d contains data outside of one aligned block duration", i)
 	}
 
-	q, err := db.Querier(context.Background(), math.MinInt64, math.MaxInt64)
+	q, err := db.Querier(math.MinInt64, math.MaxInt64)
 	require.NoError(t, err)
 	defer func() {
 		require.NoError(t, q.Close())

cmd/promtool/main.go

@@ -36,6 +36,7 @@ import (
 	"github.com/google/pprof/profile"
 	"github.com/prometheus/client_golang/api"
 	v1 "github.com/prometheus/client_golang/api/prometheus/v1"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/prometheus/client_golang/prometheus/testutil/promlint"
 	config_util "github.com/prometheus/common/config"
@@ -58,6 +59,7 @@ import (
 	"github.com/prometheus/prometheus/notifier"
 	_ "github.com/prometheus/prometheus/plugins" // Register plugins.
 	"github.com/prometheus/prometheus/promql"
+	"github.com/prometheus/prometheus/promql/parser"
 	"github.com/prometheus/prometheus/scrape"
 	"github.com/prometheus/prometheus/util/documentcli"
 )
@@ -81,15 +83,20 @@ func main() {
 	var (
 		httpRoundTripper   = api.DefaultRoundTripper
 		serverURL          *url.URL
+		remoteWriteURL     *url.URL
 		httpConfigFilePath string
 	)
 
+	ctx := context.Background()
+
 	app := kingpin.New(filepath.Base(os.Args[0]), "Tooling for the Prometheus monitoring system.").UsageWriter(os.Stdout)
 	app.Version(version.Print("promtool"))
 	app.HelpFlag.Short('h')
 
 	checkCmd := app.Command("check", "Check the resources for validity.")
 
+	experimental := app.Flag("experimental", "Enable experimental commands.").Bool()
+
 	sdCheckCmd := checkCmd.Command("service-discovery", "Perform service discovery for the given job name and report the results, including relabeling.")
 	sdConfigFile := sdCheckCmd.Arg("config-file", "The prometheus config file.").Required().ExistingFile()
 	sdJobName := sdCheckCmd.Arg("job", "The job to run service discovery for.").Required().String()
@@ -126,8 +133,8 @@ func main() {
 	checkRulesCmd := checkCmd.Command("rules", "Check if the rule files are valid or not.")
 	ruleFiles := checkRulesCmd.Arg(
 		"rule-files",
-		"The rule files to check.",
-	).Required().ExistingFiles()
+		"The rule files to check, default is read from standard input.",
+	).ExistingFiles()
 	checkRulesLint := checkRulesCmd.Flag(
 		"lint",
 		"Linting checks to apply. Available options are: "+strings.Join(lintOptions, ", ")+". Use --lint=none to disable linting",
@@ -178,8 +185,21 @@ func main() {
 	queryLabelsEnd := queryLabelsCmd.Flag("end", "End time (RFC3339 or Unix timestamp).").String()
 	queryLabelsMatch := queryLabelsCmd.Flag("match", "Series selector. Can be specified multiple times.").Strings()
 
+	pushCmd := app.Command("push", "Push to a Prometheus server.")
+	pushCmd.Flag("http.config.file", "HTTP client configuration file for promtool to connect to Prometheus.").PlaceHolder("<filename>").ExistingFileVar(&httpConfigFilePath)
+	pushMetricsCmd := pushCmd.Command("metrics", "Push metrics to a prometheus remote write (for testing purpose only).")
+	pushMetricsCmd.Arg("remote-write-url", "Prometheus remote write url to push metrics.").Required().URLVar(&remoteWriteURL)
+	metricFiles := pushMetricsCmd.Arg(
+		"metric-files",
+		"The metric files to push, default is read from standard input.",
+	).ExistingFiles()
+	pushMetricsLabels := pushMetricsCmd.Flag("label", "Label to attach to metrics. Can be specified multiple times.").Default("job=promtool").StringMap()
+	pushMetricsTimeout := pushMetricsCmd.Flag("timeout", "The time to wait for pushing metrics.").Default("30s").Duration()
+	pushMetricsHeaders := pushMetricsCmd.Flag("header", "Prometheus remote write header.").StringMap()
+
 	testCmd := app.Command("test", "Unit testing.")
 	testRulesCmd := testCmd.Command("rules", "Unit tests for rules.")
+	testRulesRun := testRulesCmd.Flag("run", "If set, will only run test groups whose names match the regular expression. Can be specified multiple times.").Strings()
 	testRulesFiles := testRulesCmd.Arg(
 		"test-rule-file",
 		"The unit test file.",
@@ -200,6 +220,7 @@ func main() {
 	analyzeBlockID := tsdbAnalyzeCmd.Arg("block id", "Block to analyze (default is the last block).").String()
 	analyzeLimit := tsdbAnalyzeCmd.Flag("limit", "How many items to show in each list.").Default("20").Int()
 	analyzeRunExtended := tsdbAnalyzeCmd.Flag("extended", "Run extended analysis.").Bool()
+	analyzeMatchers := tsdbAnalyzeCmd.Flag("match", "Series selector to analyze. Only 1 set of matchers is supported now.").String()
 
 	tsdbListCmd := tsdbCmd.Command("list", "List tsdb blocks.")
 	listHumanReadable := tsdbListCmd.Flag("human-readable", "Print human readable values.").Short('r').Bool()
@@ -232,6 +253,22 @@ func main() {
 		"A list of one or more files containing recording rules to be backfilled. All recording rules listed in the files will be backfilled. Alerting rules are not evaluated.",
 	).Required().ExistingFiles()
 
+	promQLCmd := app.Command("promql", "PromQL formatting and editing. Requires the --experimental flag.")
+
+	promQLFormatCmd := promQLCmd.Command("format", "Format PromQL query to pretty printed form.")
+	promQLFormatQuery := promQLFormatCmd.Arg("query", "PromQL query.").Required().String()
+
+	promQLLabelsCmd := promQLCmd.Command("label-matchers", "Edit label matchers contained within an existing PromQL query.")
+	promQLLabelsSetCmd := promQLLabelsCmd.Command("set", "Set a label matcher in the query.")
+	promQLLabelsSetType := promQLLabelsSetCmd.Flag("type", "Type of the label matcher to set.").Short('t').Default("=").Enum("=", "!=", "=~", "!~")
+	promQLLabelsSetQuery := promQLLabelsSetCmd.Arg("query", "PromQL query.").Required().String()
+	promQLLabelsSetName := promQLLabelsSetCmd.Arg("name", "Name of the label matcher to set.").Required().String()
+	promQLLabelsSetValue := promQLLabelsSetCmd.Arg("value", "Value of the label matcher to set.").Required().String()
+
+	promQLLabelsDeleteCmd := promQLLabelsCmd.Command("delete", "Delete a label from the query.")
+	promQLLabelsDeleteQuery := promQLLabelsDeleteCmd.Arg("query", "PromQL query.").Required().String()
+	promQLLabelsDeleteName := promQLLabelsDeleteCmd.Arg("name", "Name of the label to delete.").Required().String()
+
 	featureList := app.Flag("enable-feature", "Comma separated feature names to enable (only PromQL related and no-default-scrape-port). See https://prometheus.io/docs/prometheus/latest/feature_flags/ for the options and more details.").Default("").Strings()
 
 	documentationCmd := app.Command("write-documentation", "Generate command line documentation. Internal use.").Hidden()
@@ -281,7 +318,7 @@ func main() {
 
 	switch parsedCmd {
 	case sdCheckCmd.FullCommand():
-		os.Exit(CheckSD(*sdConfigFile, *sdJobName, *sdTimeout, noDefaultScrapePort))
+		os.Exit(CheckSD(*sdConfigFile, *sdJobName, *sdTimeout, noDefaultScrapePort, prometheus.DefaultRegisterer))
 
 	case checkConfigCmd.FullCommand():
 		os.Exit(CheckConfig(*agentMode, *checkConfigSyntaxOnly, newLintConfig(*checkConfigLint, *checkConfigLintFatal), *configFiles...))
@@ -301,6 +338,9 @@ func main() {
 	case checkMetricsCmd.FullCommand():
 		os.Exit(CheckMetrics(*checkMetricsExtended))
 
+	case pushMetricsCmd.FullCommand():
+		os.Exit(PushMetrics(remoteWriteURL, httpRoundTripper, *pushMetricsHeaders, *pushMetricsTimeout, *pushMetricsLabels, *metricFiles...))
+
 	case queryInstantCmd.FullCommand():
 		os.Exit(QueryInstant(serverURL, httpRoundTripper, *queryInstantExpr, *queryInstantTime, p))
 
@@ -328,6 +368,7 @@ func main() {
 				EnableAtModifier:     true,
 				EnableNegativeOffset: true,
 			},
+			*testRulesRun,
 			*testRulesFiles...),
 		)
 
@@ -335,26 +376,45 @@ func main() {
 		os.Exit(checkErr(benchmarkWrite(*benchWriteOutPath, *benchSamplesFile, *benchWriteNumMetrics, *benchWriteNumScrapes)))
 
 	case tsdbAnalyzeCmd.FullCommand():
-		os.Exit(checkErr(analyzeBlock(*analyzePath, *analyzeBlockID, *analyzeLimit, *analyzeRunExtended)))
+		os.Exit(checkErr(analyzeBlock(ctx, *analyzePath, *analyzeBlockID, *analyzeLimit, *analyzeRunExtended, *analyzeMatchers)))
 
 	case tsdbListCmd.FullCommand():
 		os.Exit(checkErr(listBlocks(*listPath, *listHumanReadable)))
 
 	case tsdbDumpCmd.FullCommand():
-		os.Exit(checkErr(dumpSamples(*dumpPath, *dumpMinTime, *dumpMaxTime, *dumpMatch)))
+		os.Exit(checkErr(dumpSamples(ctx, *dumpPath, *dumpMinTime, *dumpMaxTime, *dumpMatch)))
 	// TODO(aSquare14): Work on adding support for custom block size.
 	case openMetricsImportCmd.FullCommand():
 		os.Exit(backfillOpenMetrics(*importFilePath, *importDBPath, *importHumanReadable, *importQuiet, *maxBlockDuration))
 
 	case importRulesCmd.FullCommand():
 		os.Exit(checkErr(importRules(serverURL, httpRoundTripper, *importRulesStart, *importRulesEnd, *importRulesOutputDir, *importRulesEvalInterval, *maxBlockDuration, *importRulesFiles...)))
+
 	case documentationCmd.FullCommand():
 		os.Exit(checkErr(documentcli.GenerateMarkdown(app.Model(), os.Stdout)))
+
+	case promQLFormatCmd.FullCommand():
+		checkExperimental(*experimental)
+		os.Exit(checkErr(formatPromQL(*promQLFormatQuery)))
+
+	case promQLLabelsSetCmd.FullCommand():
+		checkExperimental(*experimental)
+		os.Exit(checkErr(labelsSetPromQL(*promQLLabelsSetQuery, *promQLLabelsSetType, *promQLLabelsSetName, *promQLLabelsSetValue)))
+
+	case promQLLabelsDeleteCmd.FullCommand():
+		checkExperimental(*experimental)
+		os.Exit(checkErr(labelsDeletePromQL(*promQLLabelsDeleteQuery, *promQLLabelsDeleteName)))
 	}
 }
 
-// nolint:revive
-var lintError = fmt.Errorf("lint error")
+func checkExperimental(f bool) {
+	if !f {
+		fmt.Fprintln(os.Stderr, "This command is experimental and requires the --experimental flag to be set.")
+		os.Exit(1)
+	}
+}
+
+var errLint = fmt.Errorf("lint error")
 
 type lintConfig struct {
 	all            bool
@@ -441,20 +501,12 @@ func CheckConfig(agentMode, checkSyntaxOnly bool, lintSettings lintConfig, files
 		}
 		fmt.Println()
 
-		for _, rf := range ruleFiles {
-			if n, errs := checkRules(rf, lintSettings); len(errs) > 0 {
-				fmt.Fprintln(os.Stderr, "  FAILED:")
-				for _, err := range errs {
-					fmt.Fprintln(os.Stderr, "    ", err)
-				}
-				failed = true
-				for _, err := range errs {
-					hasErrors = hasErrors || !errors.Is(err, lintError)
-				}
-			} else {
-				fmt.Printf("  SUCCESS: %d rules found\n", n)
-			}
-			fmt.Println()
+		rulesFailed, rulesHasErrors := checkRules(ruleFiles, lintSettings)
+		if rulesFailed {
+			failed = rulesFailed
+		}
+		if rulesHasErrors {
+			hasErrors = rulesHasErrors
 		}
 	}
 	if failed && hasErrors {
@@ -682,39 +734,96 @@ func checkSDFile(filename string) ([]*targetgroup.Group, error) {
 func CheckRules(ls lintConfig, files ...string) int {
 	failed := false
 	hasErrors := false
-
-	for _, f := range files {
-		if n, errs := checkRules(f, ls); errs != nil {
-			fmt.Fprintln(os.Stderr, "  FAILED:")
-			for _, e := range errs {
-				fmt.Fprintln(os.Stderr, e.Error())
-			}
-			failed = true
-			for _, err := range errs {
-				hasErrors = hasErrors || !errors.Is(err, lintError)
-			}
-		} else {
-			fmt.Printf("  SUCCESS: %d rules found\n", n)
-		}
-		fmt.Println()
+	if len(files) == 0 {
+		failed, hasErrors = checkRulesFromStdin(ls)
+	} else {
+		failed, hasErrors = checkRules(files, ls)
 	}
+
 	if failed && hasErrors {
 		return failureExitCode
 	}
 	if failed && ls.fatal {
 		return lintErrExitCode
 	}
+
 	return successExitCode
 }
 
-func checkRules(filename string, lintSettings lintConfig) (int, []error) {
-	fmt.Println("Checking", filename)
-
-	rgs, errs := rulefmt.ParseFile(filename)
-	if errs != nil {
-		return successExitCode, errs
+// checkRulesFromStdin validates rule from stdin.
+func checkRulesFromStdin(ls lintConfig) (bool, bool) {
+	failed := false
+	hasErrors := false
+	fmt.Println("Checking standard input")
+	data, err := io.ReadAll(os.Stdin)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "  FAILED:", err)
+		return true, true
 	}
+	rgs, errs := rulefmt.Parse(data)
+	if errs != nil {
+		failed = true
+		fmt.Fprintln(os.Stderr, "  FAILED:")
+		for _, e := range errs {
+			fmt.Fprintln(os.Stderr, e.Error())
+			hasErrors = hasErrors || !errors.Is(e, errLint)
+		}
+		if hasErrors {
+			return failed, hasErrors
+		}
+	}
+	if n, errs := checkRuleGroups(rgs, ls); errs != nil {
+		fmt.Fprintln(os.Stderr, "  FAILED:")
+		for _, e := range errs {
+			fmt.Fprintln(os.Stderr, e.Error())
+		}
+		failed = true
+		for _, err := range errs {
+			hasErrors = hasErrors || !errors.Is(err, errLint)
+		}
+	} else {
+		fmt.Printf("  SUCCESS: %d rules found\n", n)
+	}
+	fmt.Println()
+	return failed, hasErrors
+}
 
+// checkRules validates rule files.
+func checkRules(files []string, ls lintConfig) (bool, bool) {
+	failed := false
+	hasErrors := false
+	for _, f := range files {
+		fmt.Println("Checking", f)
+		rgs, errs := rulefmt.ParseFile(f)
+		if errs != nil {
+			failed = true
+			fmt.Fprintln(os.Stderr, "  FAILED:")
+			for _, e := range errs {
+				fmt.Fprintln(os.Stderr, e.Error())
+				hasErrors = hasErrors || !errors.Is(e, errLint)
+			}
+			if hasErrors {
+				continue
+			}
+		}
+		if n, errs := checkRuleGroups(rgs, ls); errs != nil {
+			fmt.Fprintln(os.Stderr, "  FAILED:")
+			for _, e := range errs {
+				fmt.Fprintln(os.Stderr, e.Error())
+			}
+			failed = true
+			for _, err := range errs {
+				hasErrors = hasErrors || !errors.Is(err, errLint)
+			}
+		} else {
+			fmt.Printf("  SUCCESS: %d rules found\n", n)
+		}
+		fmt.Println()
+	}
+	return failed, hasErrors
+}
+
+func checkRuleGroups(rgs *rulefmt.RuleGroups, lintSettings lintConfig) (int, []error) {
 	numRules := 0
 	for _, rg := range rgs.Groups {
 		numRules += len(rg.Rules)
@@ -731,7 +840,7 @@ func checkRules(filename string, lintSettings lintConfig) (int, []error) {
 				})
 			}
 			errMessage += "Might cause inconsistency while recording expressions"
-			return 0, []error{fmt.Errorf("%w %s", lintError, errMessage)}
+			return 0, []error{fmt.Errorf("%w %s", errLint, errMessage)}
 		}
 	}
 
@@ -1332,3 +1441,79 @@ func checkTargetGroupsForScrapeConfig(targetGroups []*targetgroup.Group, scfg *c
 
 	return nil
 }
+
+func formatPromQL(query string) error {
+	expr, err := parser.ParseExpr(query)
+	if err != nil {
+		return err
+	}
+
+	fmt.Println(expr.Pretty(0))
+	return nil
+}
+
+func labelsSetPromQL(query, labelMatchType, name, value string) error {
+	expr, err := parser.ParseExpr(query)
+	if err != nil {
+		return err
+	}
+
+	var matchType labels.MatchType
+	switch labelMatchType {
+	case parser.ItemType(parser.EQL).String():
+		matchType = labels.MatchEqual
+	case parser.ItemType(parser.NEQ).String():
+		matchType = labels.MatchNotEqual
+	case parser.ItemType(parser.EQL_REGEX).String():
+		matchType = labels.MatchRegexp
+	case parser.ItemType(parser.NEQ_REGEX).String():
+		matchType = labels.MatchNotRegexp
+	default:
+		return fmt.Errorf("invalid label match type: %s", labelMatchType)
+	}
+
+	parser.Inspect(expr, func(node parser.Node, path []parser.Node) error {
+		if n, ok := node.(*parser.VectorSelector); ok {
+			var found bool
+			for i, l := range n.LabelMatchers {
+				if l.Name == name {
+					n.LabelMatchers[i].Type = matchType
+					n.LabelMatchers[i].Value = value
+					found = true
+				}
+			}
+			if !found {
+				n.LabelMatchers = append(n.LabelMatchers, &labels.Matcher{
+					Type:  matchType,
+					Name:  name,
+					Value: value,
+				})
+			}
+		}
+		return nil
+	})
+
+	fmt.Println(expr.Pretty(0))
+	return nil
+}
+
+func labelsDeletePromQL(query, name string) error {
+	expr, err := parser.ParseExpr(query)
+	if err != nil {
+		return err
+	}
+
+	parser.Inspect(expr, func(node parser.Node, path []parser.Node) error {
+		if n, ok := node.(*parser.VectorSelector); ok {
+			for i, l := range n.LabelMatchers {
+				if l.Name == name {
+					n.LabelMatchers = append(n.LabelMatchers[:i], n.LabelMatchers[i+1:]...)
+				}
+			}
+		}
+		return nil
+	})
+
+	fmt.Println(expr.Pretty(0))
+	return nil
+}

cmd/promtool/main_test.go

@@ -56,7 +56,7 @@ func TestQueryRange(t *testing.T) {
 	defer s.Close()
 
 	urlObject, err := url.Parse(s.URL)
-	require.Equal(t, nil, err)
+	require.NoError(t, err)
 
 	p := &promqlPrinter{}
 	exitCode := QueryRange(urlObject, http.DefaultTransport, map[string]string{}, "up", "0", "300", 0, p)
@@ -79,7 +79,7 @@ func TestQueryInstant(t *testing.T) {
 	defer s.Close()
 
 	urlObject, err := url.Parse(s.URL)
-	require.Equal(t, nil, err)
+	require.NoError(t, err)
 
 	p := &promqlPrinter{}
 	exitCode := QueryInstant(urlObject, http.DefaultTransport, "up", "300", p)
@@ -450,10 +450,9 @@ func TestDocumentation(t *testing.T) {
 	cmd.Stdout = &stdout
 
 	if err := cmd.Run(); err != nil {
-		if exitError, ok := err.(*exec.ExitError); ok {
-			if exitError.ExitCode() != 0 {
-				fmt.Println("Command failed with non-zero exit code")
-			}
+		var exitError *exec.ExitError
+		if errors.As(err, &exitError) && exitError.ExitCode() != 0 {
+			fmt.Println("Command failed with non-zero exit code")
 		}
 	}
 
@@ -464,3 +463,88 @@ func TestDocumentation(t *testing.T) {
 
 	require.Equal(t, string(expectedContent), generatedContent, "Generated content does not match documentation. Hint: run `make cli-documentation`.")
 }
+
+func TestCheckRules(t *testing.T) {
+	t.Run("rules-good", func(t *testing.T) {
+		data, err := os.ReadFile("./testdata/rules.yml")
+		require.NoError(t, err)
+		r, w, err := os.Pipe()
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		_, err = w.Write(data)
+		if err != nil {
+			t.Error(err)
+		}
+		w.Close()
+
+		// Restore stdin right after the test.
+		defer func(v *os.File) { os.Stdin = v }(os.Stdin)
+		os.Stdin = r
+
+		exitCode := CheckRules(newLintConfig(lintOptionDuplicateRules, false))
+		require.Equal(t, successExitCode, exitCode, "")
+	})
+
+	t.Run("rules-bad", func(t *testing.T) {
+		data, err := os.ReadFile("./testdata/rules-bad.yml")
+		require.NoError(t, err)
+		r, w, err := os.Pipe()
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		_, err = w.Write(data)
+		if err != nil {
+			t.Error(err)
+		}
+		w.Close()
+
+		// Restore stdin right after the test.
+		defer func(v *os.File) { os.Stdin = v }(os.Stdin)
+		os.Stdin = r
+
+		exitCode := CheckRules(newLintConfig(lintOptionDuplicateRules, false))
+		require.Equal(t, failureExitCode, exitCode, "")
+	})
+
+	t.Run("rules-lint-fatal", func(t *testing.T) {
+		data, err := os.ReadFile("./testdata/prometheus-rules.lint.yml")
+		require.NoError(t, err)
+		r, w, err := os.Pipe()
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		_, err = w.Write(data)
+		if err != nil {
+			t.Error(err)
+		}
+		w.Close()
+
+		// Restore stdin right after the test.
+		defer func(v *os.File) { os.Stdin = v }(os.Stdin)
+		os.Stdin = r
+
+		exitCode := CheckRules(newLintConfig(lintOptionDuplicateRules, true))
+		require.Equal(t, lintErrExitCode, exitCode, "")
+	})
+}
+
+func TestCheckRulesWithRuleFiles(t *testing.T) {
+	t.Run("rules-good", func(t *testing.T) {
+		exitCode := CheckRules(newLintConfig(lintOptionDuplicateRules, false), "./testdata/rules.yml")
+		require.Equal(t, successExitCode, exitCode, "")
+	})
+
+	t.Run("rules-bad", func(t *testing.T) {
+		exitCode := CheckRules(newLintConfig(lintOptionDuplicateRules, false), "./testdata/rules-bad.yml")
+		require.Equal(t, failureExitCode, exitCode, "")
+	})
+
+	t.Run("rules-lint-fatal", func(t *testing.T) {
+		exitCode := CheckRules(newLintConfig(lintOptionDuplicateRules, true), "./testdata/prometheus-rules.lint.yml")
+		require.Equal(t, lintErrExitCode, exitCode, "")
+	})
+}

cmd/promtool/metrics.go

@@ -0,0 +1,138 @@
+// Copyright 2023 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"time"
+
+	"github.com/golang/snappy"
+	config_util "github.com/prometheus/common/config"
+	"github.com/prometheus/common/model"
+
+	"github.com/prometheus/prometheus/storage/remote"
+	"github.com/prometheus/prometheus/util/fmtutil"
+)
+
+// Push metrics to a prometheus remote write (for testing purpose only).
+func PushMetrics(url *url.URL, roundTripper http.RoundTripper, headers map[string]string, timeout time.Duration, labels map[string]string, files ...string) int {
+	addressURL, err := url.Parse(url.String())
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		return failureExitCode
+	}
+
+	// build remote write client
+	writeClient, err := remote.NewWriteClient("remote-write", &remote.ClientConfig{
+		URL:     &config_util.URL{URL: addressURL},
+		Timeout: model.Duration(timeout),
+	})
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		return failureExitCode
+	}
+
+	// set custom tls config from httpConfigFilePath
+	// set custom headers to every request
+	client, ok := writeClient.(*remote.Client)
+	if !ok {
+		fmt.Fprintln(os.Stderr, fmt.Errorf("unexpected type %T", writeClient))
+		return failureExitCode
+	}
+	client.Client.Transport = &setHeadersTransport{
+		RoundTripper: roundTripper,
+		headers:      headers,
+	}
+
+	var data []byte
+	var failed bool
+
+	if len(files) == 0 {
+		data, err = io.ReadAll(os.Stdin)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, "  FAILED:", err)
+			return failureExitCode
+		}
+		fmt.Printf("Parsing standard input\n")
+		if parseAndPushMetrics(client, data, labels) {
+			fmt.Printf("  SUCCESS: metrics pushed to remote write.\n")
+			return successExitCode
+		}
+		return failureExitCode
+	}
+
+	for _, file := range files {
+		data, err = os.ReadFile(file)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, "  FAILED:", err)
+			failed = true
+			continue
+		}
+
+		fmt.Printf("Parsing metrics file %s\n", file)
+		if parseAndPushMetrics(client, data, labels) {
+			fmt.Printf("  SUCCESS: metrics file %s pushed to remote write.\n", file)
+			continue
+		}
+		failed = true
+	}
+
+	if failed {
+		return failureExitCode
+	}
+
+	return successExitCode
+}
+
+func parseAndPushMetrics(client *remote.Client, data []byte, labels map[string]string) bool {
+	metricsData, err := fmtutil.MetricTextToWriteRequest(bytes.NewReader(data), labels)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "  FAILED:", err)
+		return false
+	}
+
+	raw, err := metricsData.Marshal()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "  FAILED:", err)
+		return false
+	}
+
+	// Encode the request body into snappy encoding.
+	compressed := snappy.Encode(nil, raw)
+	err = client.Store(context.Background(), compressed, 0)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "  FAILED:", err)
+		return false
+	}
+
+	return true
+}
+
+type setHeadersTransport struct {
+	http.RoundTripper
+	headers map[string]string
+}
+
+func (s *setHeadersTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	for key, value := range s.headers {
+		req.Header.Set(key, value)
+	}
+	return s.RoundTripper.RoundTrip(req)
+}

cmd/promtool/rules_test.go

@@ -35,7 +35,7 @@ type mockQueryRangeAPI struct {
 	samples model.Matrix
 }
 
-func (mockAPI mockQueryRangeAPI) QueryRange(_ context.Context, query string, r v1.Range, opts ...v1.Option) (model.Value, v1.Warnings, error) { // nolint:revive
+func (mockAPI mockQueryRangeAPI) QueryRange(_ context.Context, query string, r v1.Range, opts ...v1.Option) (model.Value, v1.Warnings, error) {
 	return mockAPI.samples, v1.Warnings{}, nil
 }
 
@@ -91,13 +91,13 @@ func TestBackfillRuleIntegration(t *testing.T) {
 				for _, err := range errs {
 					require.NoError(t, err)
 				}
-				require.Equal(t, 3, len(ruleImporter.groups))
+				require.Len(t, ruleImporter.groups, 3)
 				group1 := ruleImporter.groups[path1+";group0"]
 				require.NotNil(t, group1)
 				const defaultInterval = 60
 				require.Equal(t, defaultInterval*time.Second, group1.Interval())
 				gRules := group1.Rules()
-				require.Equal(t, 1, len(gRules))
+				require.Len(t, gRules, 1)
 				require.Equal(t, "rule1", gRules[0].Name())
 				require.Equal(t, "ruleExpr", gRules[0].Query().String())
 				require.Equal(t, 1, gRules[0].Labels().Len())
@@ -106,7 +106,7 @@ func TestBackfillRuleIntegration(t *testing.T) {
 				require.NotNil(t, group2)
 				require.Equal(t, defaultInterval*time.Second, group2.Interval())
 				g2Rules := group2.Rules()
-				require.Equal(t, 2, len(g2Rules))
+				require.Len(t, g2Rules, 2)
 				require.Equal(t, "grp2_rule1", g2Rules[0].Name())
 				require.Equal(t, "grp2_rule1_expr", g2Rules[0].Query().String())
 				require.Equal(t, 0, g2Rules[0].Labels().Len())
@@ -122,12 +122,12 @@ func TestBackfillRuleIntegration(t *testing.T) {
 				require.NoError(t, err)
 
 				blocks := db.Blocks()
-				require.Equal(t, (i+1)*tt.expectedBlockCount, len(blocks))
+				require.Len(t, blocks, (i+1)*tt.expectedBlockCount)
 
-				q, err := db.Querier(context.Background(), math.MinInt64, math.MaxInt64)
+				q, err := db.Querier(math.MinInt64, math.MaxInt64)
 				require.NoError(t, err)
 
-				selectedSeries := q.Select(false, nil, labels.MustNewMatcher(labels.MatchRegexp, "", ".*"))
+				selectedSeries := q.Select(ctx, false, nil, labels.MustNewMatcher(labels.MatchRegexp, "", ".*"))
 				var seriesCount, samplesCount int
 				for selectedSeries.Next() {
 					seriesCount++
@@ -248,11 +248,11 @@ func TestBackfillLabels(t *testing.T) {
 	db, err := tsdb.Open(tmpDir, nil, nil, opts, nil)
 	require.NoError(t, err)
 
-	q, err := db.Querier(context.Background(), math.MinInt64, math.MaxInt64)
+	q, err := db.Querier(math.MinInt64, math.MaxInt64)
 	require.NoError(t, err)
 
 	t.Run("correct-labels", func(t *testing.T) {
-		selectedSeries := q.Select(false, nil, labels.MustNewMatcher(labels.MatchRegexp, "", ".*"))
+		selectedSeries := q.Select(ctx, false, nil, labels.MustNewMatcher(labels.MatchRegexp, "", ".*"))
 		for selectedSeries.Next() {
 			series := selectedSeries.At()
 			expectedLabels := labels.FromStrings("__name__", "rulename", "name1", "value-from-rule")

cmd/promtool/sd.go

@@ -22,6 +22,7 @@ import (
 	"time"
 
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/prometheus/prometheus/config"
 	"github.com/prometheus/prometheus/discovery"
@@ -37,7 +38,7 @@ type sdCheckResult struct {
 }
 
 // CheckSD performs service discovery for the given job name and reports the results.
-func CheckSD(sdConfigFiles, sdJobName string, sdTimeout time.Duration, noDefaultScrapePort bool) int {
+func CheckSD(sdConfigFiles, sdJobName string, sdTimeout time.Duration, noDefaultScrapePort bool, registerer prometheus.Registerer) int {
 	logger := log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
 
 	cfg, err := config.LoadFile(sdConfigFiles, false, false, logger)
@@ -77,7 +78,7 @@ func CheckSD(sdConfigFiles, sdJobName string, sdTimeout time.Duration, noDefault
 	defer cancel()
 
 	for _, cfg := range scrapeConfig.ServiceDiscoveryConfigs {
-		d, err := cfg.NewDiscoverer(discovery.DiscovererOptions{Logger: logger})
+		d, err := cfg.NewDiscoverer(discovery.DiscovererOptions{Logger: logger, Registerer: registerer})
 		if err != nil {
 			fmt.Fprintln(os.Stderr, "Could not create new discoverer", err)
 			return failureExitCode

cmd/promtool/sd_test.go

@@ -35,7 +35,7 @@ func TestSDCheckResult(t *testing.T) {
 	}}
 
 	reg, err := relabel.NewRegexp("(.*)")
-	require.Nil(t, err)
+	require.NoError(t, err)
 
 	scrapeConfig := &config.ScrapeConfig{
 		ScrapeInterval: model.Duration(1 * time.Minute),

cmd/promtool/testdata/no-test-group-interval.yml

@@ -0,0 +1,15 @@
+tests:
+  - input_series:
+      - series: test
+        values: 0 1
+    promql_expr_test:
+      - expr: test
+        eval_time: 59s
+        exp_samples:
+          - value: 0
+            labels: test
+      - expr: test
+        eval_time: 1m
+        exp_samples:
+          - value: 1
+            labels: test

cmd/promtool/testdata/rules-bad.yml

@@ -0,0 +1,28 @@
+# This is the rules file.
+
+groups:
+  - name: alerts
+    rules:
+      - alert: InstanceDown
+        expr: up == 0
+        for: 5m
+        labels:
+          severity: page
+        annotations:
+          summary: "Instance {{ $label.foo }} down"
+          description: "{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 5 minutes."
+      - alert: AlwaysFiring
+        expr: 1
+
+  - name: rules
+    rules:
+      - record: job:test:count_over_time1m
+        expr: sum without(instance) (count_over_time(test[1m]))
+
+      # A recording rule that doesn't depend on input series.
+      - record: fixed_data
+        expr: 1
+
+      # Subquery with default resolution test.
+      - record: suquery_interval_test
+        expr: count_over_time(up[5m:])

cmd/promtool/testdata/rules_run.yml

@@ -0,0 +1,30 @@
+rule_files:
+  - rules.yml
+
+evaluation_interval: 1m
+
+# Minimal test cases to check focus on a rule group.
+tests:
+  - name: correct test
+    input_series:
+      - series: test
+        values: 1
+
+    promql_expr_test:
+      - expr: test
+        eval_time: 0
+        exp_samples:
+          - value: 1
+            labels: test
+
+  - name: wrong test
+    input_series:
+      - series: test
+        values: 0
+
+    promql_expr_test:
+      - expr: test
+        eval_time: 0
+        exp_samples:
+          - value: 1
+            labels: test

cmd/promtool/testdata/unittest.yml

@@ -10,6 +10,21 @@ tests:
       - series: test_full
         values: "0 0"
 
+      - series: test_repeat
+        values: "1x2"
+
+      - series: test_increase
+        values: "1+1x2"
+
+      - series: test_histogram
+        values: "{{schema:1 sum:-0.3 count:32.1 z_bucket:7.1 z_bucket_w:0.05 buckets:[5.1 10 7] offset:-3 n_buckets:[4.1 5] n_offset:-5}}"
+
+      - series: test_histogram_repeat
+        values: "{{sum:3 count:2 buckets:[2]}}x2"
+
+      - series: test_histogram_increase
+        values: "{{sum:3 count:2 buckets:[2]}}+{{sum:1.3 count:1 buckets:[1]}}x2"
+
       - series: test_stale
         values: "0 stale"
 
@@ -31,6 +46,37 @@ tests:
         exp_samples:
           - value: 60
 
+      # Repeat & increase
+      - expr: test_repeat
+        eval_time: 2m
+        exp_samples:
+          - value: 1
+            labels: "test_repeat"
+      - expr: test_increase
+        eval_time: 2m
+        exp_samples:
+          - value: 3
+            labels: "test_increase"
+
+      # Histograms
+      - expr: test_histogram
+        eval_time: 1m
+        exp_samples:
+          - labels: "test_histogram"
+            histogram: "{{schema:1 sum:-0.3 count:32.1 z_bucket:7.1 z_bucket_w:0.05 buckets:[5.1 10 7] offset:-3 n_buckets:[4.1 5] n_offset:-5}}"
+
+      - expr: test_histogram_repeat
+        eval_time: 2m
+        exp_samples:
+          - labels: "test_histogram_repeat"
+            histogram: "{{count:2 sum:3 buckets:[2]}}"
+
+      - expr: test_histogram_increase
+        eval_time: 2m
+        exp_samples:
+          - labels: "test_histogram_increase"
+            histogram: "{{count:4 sum:5.6 buckets:[4]}}"
+
       # Ensure a value is stale as soon as it is marked as such.
       - expr: test_stale
         eval_time: 59s

cmd/promtool/tsdb.go

@@ -16,33 +16,32 @@ package main
 import (
 	"bufio"
 	"context"
+	"errors"
 	"fmt"
 	"io"
-	"math"
 	"os"
 	"path/filepath"
 	"runtime"
 	"runtime/pprof"
-	"sort"
 	"strconv"
 	"strings"
 	"sync"
 	"text/tabwriter"
 	"time"
 
-	"github.com/prometheus/prometheus/promql/parser"
-	"github.com/prometheus/prometheus/storage"
-	"github.com/prometheus/prometheus/tsdb/chunkenc"
-	"github.com/prometheus/prometheus/tsdb/index"
-
 	"github.com/alecthomas/units"
 	"github.com/go-kit/log"
+	"golang.org/x/exp/slices"
 
 	"github.com/prometheus/prometheus/model/labels"
+	"github.com/prometheus/prometheus/promql/parser"
+	"github.com/prometheus/prometheus/storage"
 	"github.com/prometheus/prometheus/tsdb"
+	"github.com/prometheus/prometheus/tsdb/chunkenc"
 	"github.com/prometheus/prometheus/tsdb/chunks"
 	tsdb_errors "github.com/prometheus/prometheus/tsdb/errors"
 	"github.com/prometheus/prometheus/tsdb/fileutil"
+	"github.com/prometheus/prometheus/tsdb/index"
 )
 
 const timeDelta = 30000
@@ -398,29 +397,33 @@ func openBlock(path, blockID string) (*tsdb.DBReadOnly, tsdb.BlockReader, error)
 	if err != nil {
 		return nil, nil, err
 	}
-	blocks, err := db.Blocks()
+
+	if blockID == "" {
+		blockID, err = db.LastBlockID()
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+
+	b, err := db.Block(blockID)
 	if err != nil {
 		return nil, nil, err
 	}
-	var block tsdb.BlockReader
-	switch {
-	case blockID != "":
-		for _, b := range blocks {
-			if b.Meta().ULID.String() == blockID {
-				block = b
-				break
-			}
-		}
-	case len(blocks) > 0:
-		block = blocks[len(blocks)-1]
-	}
-	if block == nil {
-		return nil, nil, fmt.Errorf("block %s not found", blockID)
-	}
-	return db, block, nil
+
+	return db, b, nil
 }
 
-func analyzeBlock(path, blockID string, limit int, runExtended bool) error {
+func analyzeBlock(ctx context.Context, path, blockID string, limit int, runExtended bool, matchers string) error {
+	var (
+		selectors []*labels.Matcher
+		err       error
+	)
+	if len(matchers) > 0 {
+		selectors, err = parser.ParseMetricSelector(matchers)
+		if err != nil {
+			return err
+		}
+	}
 	db, block, err := openBlock(path, blockID)
 	if err != nil {
 		return err
@@ -433,14 +436,17 @@ func analyzeBlock(path, blockID string, limit int, runExtended bool) error {
 	fmt.Printf("Block ID: %s\n", meta.ULID)
 	// Presume 1ms resolution that Prometheus uses.
 	fmt.Printf("Duration: %s\n", (time.Duration(meta.MaxTime-meta.MinTime) * 1e6).String())
-	fmt.Printf("Series: %d\n", meta.Stats.NumSeries)
+	fmt.Printf("Total Series: %d\n", meta.Stats.NumSeries)
+	if len(matchers) > 0 {
+		fmt.Printf("Matcher: %s\n", matchers)
+	}
 	ir, err := block.Index()
 	if err != nil {
 		return err
 	}
 	defer ir.Close()
 
-	allLabelNames, err := ir.LabelNames()
+	allLabelNames, err := ir.LabelNames(ctx, selectors...)
 	if err != nil {
 		return err
 	}
@@ -453,7 +459,16 @@ func analyzeBlock(path, blockID string, limit int, runExtended bool) error {
 	postingInfos := []postingInfo{}
 
 	printInfo := func(postingInfos []postingInfo) {
-		sort.Slice(postingInfos, func(i, j int) bool { return postingInfos[i].metric > postingInfos[j].metric })
+		slices.SortFunc(postingInfos, func(a, b postingInfo) int {
+			switch {
+			case b.metric < a.metric:
+				return -1
+			case b.metric > a.metric:
+				return 1
+			default:
+				return 0
+			}
+		})
 
 		for i, pc := range postingInfos {
 			if i >= limit {
@@ -467,10 +482,30 @@ func analyzeBlock(path, blockID string, limit int, runExtended bool) error {
 	labelpairsUncovered := map[string]uint64{}
 	labelpairsCount := map[string]uint64{}
 	entries := 0
-	p, err := ir.Postings("", "") // The special all key.
-	if err != nil {
-		return err
+	var (
+		p    index.Postings
+		refs []storage.SeriesRef
+	)
+	if len(matchers) > 0 {
+		p, err = tsdb.PostingsForMatchers(ctx, ir, selectors...)
+		if err != nil {
+			return err
+		}
+		// Expand refs first and cache in memory.
+		// So later we don't have to expand again.
+		refs, err = index.ExpandPostings(p)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("Matched series: %d\n", len(refs))
+		p = index.NewListPostings(refs)
+	} else {
+		p, err = ir.Postings(ctx, "", "") // The special all key.
+		if err != nil {
+			return err
+		}
 	}
+
 	chks := []chunks.Meta{}
 	builder := labels.ScratchBuilder{}
 	for p.Next() {
@@ -519,7 +554,7 @@ func analyzeBlock(path, blockID string, limit int, runExtended bool) error {
 
 	postingInfos = postingInfos[:0]
 	for _, n := range allLabelNames {
-		values, err := ir.SortedLabelValues(n)
+		values, err := ir.SortedLabelValues(ctx, n, selectors...)
 		if err != nil {
 			return err
 		}
@@ -535,7 +570,7 @@ func analyzeBlock(path, blockID string, limit int, runExtended bool) error {
 
 	postingInfos = postingInfos[:0]
 	for _, n := range allLabelNames {
-		lv, err := ir.SortedLabelValues(n)
+		lv, err := ir.SortedLabelValues(ctx, n, selectors...)
 		if err != nil {
 			return err
 		}
@@ -545,15 +580,16 @@ func analyzeBlock(path, blockID string, limit int, runExtended bool) error {
 	printInfo(postingInfos)
 
 	postingInfos = postingInfos[:0]
-	lv, err := ir.SortedLabelValues("__name__")
+	lv, err := ir.SortedLabelValues(ctx, "__name__", selectors...)
 	if err != nil {
 		return err
 	}
 	for _, n := range lv {
-		postings, err := ir.Postings("__name__", n)
+		postings, err := ir.Postings(ctx, "__name__", n)
 		if err != nil {
 			return err
 		}
+		postings = index.Intersect(postings, index.NewListPostings(refs))
 		count := 0
 		for postings.Next() {
 			count++
@@ -567,17 +603,24 @@ func analyzeBlock(path, blockID string, limit int, runExtended bool) error {
 	printInfo(postingInfos)
 
 	if runExtended {
-		return analyzeCompaction(block, ir)
+		return analyzeCompaction(ctx, block, ir, selectors)
 	}
 
 	return nil
 }
 
-func analyzeCompaction(block tsdb.BlockReader, indexr tsdb.IndexReader) (err error) {
-	postingsr, err := indexr.Postings(index.AllPostingsKey())
+func analyzeCompaction(ctx context.Context, block tsdb.BlockReader, indexr tsdb.IndexReader, matchers []*labels.Matcher) (err error) {
+	var postingsr index.Postings
+	if len(matchers) > 0 {
+		postingsr, err = tsdb.PostingsForMatchers(ctx, indexr, matchers...)
+	} else {
+		n, v := index.AllPostingsKey()
+		postingsr, err = indexr.Postings(ctx, n, v)
+	}
 	if err != nil {
 		return err
 	}
+
 	chunkr, err := block.Chunks()
 	if err != nil {
 		return err
@@ -586,10 +629,12 @@ func analyzeCompaction(block tsdb.BlockReader, indexr tsdb.IndexReader) (err err
 		err = tsdb_errors.NewMulti(err, chunkr.Close()).Err()
 	}()
 
-	const maxSamplesPerChunk = 120
-	nBuckets := 10
-	histogram := make([]int, nBuckets)
 	totalChunks := 0
+	floatChunkSamplesCount := make([]int, 0)
+	floatChunkSize := make([]int, 0)
+	histogramChunkSamplesCount := make([]int, 0)
+	histogramChunkSize := make([]int, 0)
+	histogramChunkBucketsCount := make([]int, 0)
 	var builder labels.ScratchBuilder
 	for postingsr.Next() {
 		var chks []chunks.Meta
@@ -599,34 +644,69 @@ func analyzeCompaction(block tsdb.BlockReader, indexr tsdb.IndexReader) (err err
 
 		for _, chk := range chks {
 			// Load the actual data of the chunk.
-			chk, err := chunkr.Chunk(chk)
+			chk, iterable, err := chunkr.ChunkOrIterable(chk)
 			if err != nil {
 				return err
 			}
-			chunkSize := math.Min(float64(chk.NumSamples()), maxSamplesPerChunk)
-			// Calculate the bucket for the chunk and increment it in the histogram.
-			bucket := int(math.Ceil(float64(nBuckets)*chunkSize/maxSamplesPerChunk)) - 1
-			histogram[bucket]++
+			// Chunks within blocks should not need to be re-written, so an
+			// iterable is not expected to be returned from the chunk reader.
+			if iterable != nil {
+				return errors.New("ChunkOrIterable should not return an iterable when reading a block")
+			}
+			switch chk.Encoding() {
+			case chunkenc.EncXOR:
+				floatChunkSamplesCount = append(floatChunkSamplesCount, chk.NumSamples())
+				floatChunkSize = append(floatChunkSize, len(chk.Bytes()))
+			case chunkenc.EncFloatHistogram:
+				histogramChunkSamplesCount = append(histogramChunkSamplesCount, chk.NumSamples())
+				histogramChunkSize = append(histogramChunkSize, len(chk.Bytes()))
+				fhchk, ok := chk.(*chunkenc.FloatHistogramChunk)
+				if !ok {
+					return fmt.Errorf("chunk is not FloatHistogramChunk")
+				}
+				it := fhchk.Iterator(nil)
+				bucketCount := 0
+				for it.Next() == chunkenc.ValFloatHistogram {
+					_, f := it.AtFloatHistogram()
+					bucketCount += len(f.PositiveBuckets)
+					bucketCount += len(f.NegativeBuckets)
+				}
+				histogramChunkBucketsCount = append(histogramChunkBucketsCount, bucketCount)
+			case chunkenc.EncHistogram:
+				histogramChunkSamplesCount = append(histogramChunkSamplesCount, chk.NumSamples())
+				histogramChunkSize = append(histogramChunkSize, len(chk.Bytes()))
+				hchk, ok := chk.(*chunkenc.HistogramChunk)
+				if !ok {
+					return fmt.Errorf("chunk is not HistogramChunk")
+				}
+				it := hchk.Iterator(nil)
+				bucketCount := 0
+				for it.Next() == chunkenc.ValHistogram {
+					_, f := it.AtHistogram()
+					bucketCount += len(f.PositiveBuckets)
+					bucketCount += len(f.NegativeBuckets)
+				}
+				histogramChunkBucketsCount = append(histogramChunkBucketsCount, bucketCount)
+			}
 			totalChunks++
 		}
 	}
 
 	fmt.Printf("\nCompaction analysis:\n")
-	fmt.Println("Fullness: Amount of samples in chunks (100% is 120 samples)")
-	// Normalize absolute counts to percentages and print them out.
-	for bucket, count := range histogram {
-		percentage := 100.0 * count / totalChunks
-		fmt.Printf("%7d%%: ", (bucket+1)*10)
-		for j := 0; j < percentage; j++ {
-			fmt.Printf("#")
-		}
-		fmt.Println()
-	}
+	fmt.Println()
+	displayHistogram("samples per float chunk", floatChunkSamplesCount, totalChunks)
 
+	displayHistogram("bytes per float chunk", floatChunkSize, totalChunks)
+
+	displayHistogram("samples per histogram chunk", histogramChunkSamplesCount, totalChunks)
+
+	displayHistogram("bytes per histogram chunk", histogramChunkSize, totalChunks)
+
+	displayHistogram("buckets per histogram chunk", histogramChunkBucketsCount, totalChunks)
 	return nil
 }
 
-func dumpSamples(path string, mint, maxt int64, match string) (err error) {
+func dumpSamples(ctx context.Context, path string, mint, maxt int64, match string) (err error) {
 	db, err := tsdb.OpenDBReadOnly(path, nil)
 	if err != nil {
 		return err
@@ -634,7 +714,7 @@ func dumpSamples(path string, mint, maxt int64, match string) (err error) {
 	defer func() {
 		err = tsdb_errors.NewMulti(err, db.Close()).Err()
 	}()
-	q, err := db.Querier(context.TODO(), mint, maxt)
+	q, err := db.Querier(mint, maxt)
 	if err != nil {
 		return err
 	}
@@ -644,7 +724,7 @@ func dumpSamples(path string, mint, maxt int64, match string) (err error) {
 	if err != nil {
 		return err
 	}
-	ss := q.Select(false, nil, matchers...)
+	ss := q.Select(ctx, false, nil, matchers...)
 
 	for ss.Next() {
 		series := ss.At()
@@ -654,13 +734,21 @@ func dumpSamples(path string, mint, maxt int64, match string) (err error) {
 			ts, val := it.At()
 			fmt.Printf("%s %g %d\n", lbs, val, ts)
 		}
+		for it.Next() == chunkenc.ValFloatHistogram {
+			ts, fh := it.AtFloatHistogram()
+			fmt.Printf("%s %s %d\n", lbs, fh.String(), ts)
+		}
+		for it.Next() == chunkenc.ValHistogram {
+			ts, h := it.AtHistogram()
+			fmt.Printf("%s %s %d\n", lbs, h.String(), ts)
+		}
 		if it.Err() != nil {
 			return ss.Err()
 		}
 	}
 
 	if ws := ss.Warnings(); len(ws) > 0 {
-		return tsdb_errors.NewMulti(ws...).Err()
+		return tsdb_errors.NewMulti(ws.AsErrors()...).Err()
 	}
 
 	if ss.Err() != nil {
@@ -690,3 +778,42 @@ func backfillOpenMetrics(path, outputDir string, humanReadable, quiet bool, maxB
 
 	return checkErr(backfill(5000, inputFile.Bytes(), outputDir, humanReadable, quiet, maxBlockDuration))
 }
+
+func displayHistogram(dataType string, datas []int, total int) {
+	slices.Sort(datas)
+	start, end, step := generateBucket(datas[0], datas[len(datas)-1])
+	sum := 0
+	buckets := make([]int, (end-start)/step+1)
+	maxCount := 0
+	for _, c := range datas {
+		sum += c
+		buckets[(c-start)/step]++
+		if buckets[(c-start)/step] > maxCount {
+			maxCount = buckets[(c-start)/step]
+		}
+	}
+	avg := sum / len(datas)
+	fmt.Printf("%s (min/avg/max): %d/%d/%d\n", dataType, datas[0], avg, datas[len(datas)-1])
+	maxLeftLen := strconv.Itoa(len(fmt.Sprintf("%d", end)))
+	maxRightLen := strconv.Itoa(len(fmt.Sprintf("%d", end+step)))
+	maxCountLen := strconv.Itoa(len(fmt.Sprintf("%d", maxCount)))
+	for bucket, count := range buckets {
+		percentage := 100.0 * count / total
+		fmt.Printf("[%"+maxLeftLen+"d, %"+maxRightLen+"d]: %"+maxCountLen+"d %s\n", bucket*step+start+1, (bucket+1)*step+start, count, strings.Repeat("#", percentage))
+	}
+	fmt.Println()
+}
+
+func generateBucket(min, max int) (start, end, step int) {
+	s := (max - min) / 10
+
+	step = 10
+	for step < s && step <= 10000 {
+		step *= 10
+	}
+
+	start = min - min%step
+	end = max - max%step + step
+
+	return
+}

cmd/promtool/tsdb_test.go

@@ -0,0 +1,43 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGenerateBucket(t *testing.T) {
+	tcs := []struct {
+		min, max         int
+		start, end, step int
+	}{
+		{
+			min:   101,
+			max:   141,
+			start: 100,
+			end:   150,
+			step:  10,
+		},
+	}
+
+	for _, tc := range tcs {
+		start, end, step := generateBucket(tc.min, tc.max)
+
+		require.Equal(t, tc.start, start)
+		require.Equal(t, tc.end, end)
+		require.Equal(t, tc.step, step)
+	}
+}

cmd/promtool/unittest.go

@@ -26,9 +26,11 @@ import (
 	"time"
 
 	"github.com/go-kit/log"
+	"github.com/grafana/regexp"
 	"github.com/prometheus/common/model"
 	"gopkg.in/yaml.v2"
 
+	"github.com/prometheus/prometheus/model/histogram"
 	"github.com/prometheus/prometheus/model/labels"
 	"github.com/prometheus/prometheus/promql"
 	"github.com/prometheus/prometheus/promql/parser"
@@ -38,11 +40,16 @@ import (
 
 // RulesUnitTest does unit testing of rules based on the unit testing files provided.
 // More info about the file format can be found in the docs.
-func RulesUnitTest(queryOpts promql.LazyLoaderOpts, files ...string) int {
+func RulesUnitTest(queryOpts promql.LazyLoaderOpts, runStrings []string, files ...string) int {
 	failed := false
 
+	var run *regexp.Regexp
+	if runStrings != nil {
+		run = regexp.MustCompile(strings.Join(runStrings, "|"))
+	}
+
 	for _, f := range files {
-		if errs := ruleUnitTest(f, queryOpts); errs != nil {
+		if errs := ruleUnitTest(f, queryOpts, run); errs != nil {
 			fmt.Fprintln(os.Stderr, "  FAILED:")
 			for _, e := range errs {
 				fmt.Fprintln(os.Stderr, e.Error())
@@ -60,7 +67,7 @@ func RulesUnitTest(queryOpts promql.LazyLoaderOpts, files ...string) int {
 	return successExitCode
 }
 
-func ruleUnitTest(filename string, queryOpts promql.LazyLoaderOpts) []error {
+func ruleUnitTest(filename string, queryOpts promql.LazyLoaderOpts, run *regexp.Regexp) []error {
 	fmt.Println("Unit Testing: ", filename)
 
 	b, err := os.ReadFile(filename)
@@ -95,6 +102,13 @@ func ruleUnitTest(filename string, queryOpts promql.LazyLoaderOpts) []error {
 	// Testing.
 	var errs []error
 	for _, t := range unitTestInp.Tests {
+		if !matchesRun(t.TestGroupName, run) {
+			continue
+		}
+
+		if t.Interval == 0 {
+			t.Interval = unitTestInp.EvaluationInterval
+		}
 		ers := t.test(evalInterval, groupOrderMap, queryOpts, unitTestInp.RuleFiles...)
 		if ers != nil {
 			errs = append(errs, ers...)
@@ -107,6 +121,14 @@ func ruleUnitTest(filename string, queryOpts promql.LazyLoaderOpts) []error {
 	return nil
 }
 
+func matchesRun(name string, run *regexp.Regexp) bool {
+	if run == nil {
+		return true
+	}
+
+	return run.MatchString(name)
+}
+
 // unitTestFile holds the contents of a single unit test file.
 type unitTestFile struct {
 	RuleFiles          []string       `yaml:"rule_files"`
@@ -240,7 +262,7 @@ func (tg *testGroup) test(evalInterval time.Duration, groupOrderMap map[string]i
 				g.Eval(suite.Context(), ts)
 				for _, r := range g.Rules() {
 					if r.LastError() != nil {
-						evalErrs = append(evalErrs, fmt.Errorf("    rule: %s, time: %s, err: %v",
+						evalErrs = append(evalErrs, fmt.Errorf("    rule: %s, time: %s, err: %w",
 							r.Name(), ts.Sub(time.Unix(0, 0).UTC()), r.LastError()))
 					}
 				}
@@ -346,14 +368,29 @@ Outer:
 		var gotSamples []parsedSample
 		for _, s := range got {
 			gotSamples = append(gotSamples, parsedSample{
-				Labels: s.Metric.Copy(),
-				Value:  s.F,
+				Labels:    s.Metric.Copy(),
+				Value:     s.F,
+				Histogram: promql.HistogramTestExpression(s.H),
 			})
 		}
 
 		var expSamples []parsedSample
 		for _, s := range testCase.ExpSamples {
 			lb, err := parser.ParseMetric(s.Labels)
+			var hist *histogram.FloatHistogram
+			if err == nil && s.Histogram != "" {
+				_, values, parseErr := parser.ParseSeriesDesc("{} " + s.Histogram)
+				switch {
+				case parseErr != nil:
+					err = parseErr
+				case len(values) != 1:
+					err = fmt.Errorf("expected 1 value, got %d", len(values))
+				case values[0].Histogram == nil:
+					err = fmt.Errorf("expected histogram, got %v", values[0])
+				default:
+					hist = values[0].Histogram
+				}
+			}
 			if err != nil {
 				err = fmt.Errorf("labels %q: %w", s.Labels, err)
 				errs = append(errs, fmt.Errorf("    expr: %q, time: %s, err: %w", testCase.Expr,
@@ -361,8 +398,9 @@ Outer:
 				continue Outer
 			}
 			expSamples = append(expSamples, parsedSample{
-				Labels: lb,
-				Value:  s.Value,
+				Labels:    lb,
+				Value:     s.Value,
+				Histogram: promql.HistogramTestExpression(hist),
 			})
 		}
 
@@ -530,14 +568,16 @@ type promqlTestCase struct {
 }
 
 type sample struct {
-	Labels string  `yaml:"labels"`
-	Value  float64 `yaml:"value"`
+	Labels    string  `yaml:"labels"`
+	Value     float64 `yaml:"value"`
+	Histogram string  `yaml:"histogram"` // A non-empty string means Value is ignored.
 }
 
 // parsedSample is a sample with parsed Labels.
 type parsedSample struct {
-	Labels labels.Labels
-	Value  float64
+	Labels    labels.Labels
+	Value     float64
+	Histogram string // TestExpression() of histogram.FloatHistogram
 }
 
 func parsedSamplesString(pss []parsedSample) string {
@@ -552,5 +592,8 @@ func parsedSamplesString(pss []parsedSample) string {
 }
 
 func (ps *parsedSample) String() string {
+	if ps.Histogram != "" {
+		return ps.Labels.String() + " " + ps.Histogram
+	}
 	return ps.Labels.String() + " " + strconv.FormatFloat(ps.Value, 'E', -1, 64)
 }

cmd/promtool/unittest_test.go

@@ -112,10 +112,73 @@ func TestRulesUnitTest(t *testing.T) {
 			},
 			want: 0,
 		},
+		{
+			name: "No test group interval",
+			args: args{
+				files: []string{"./testdata/no-test-group-interval.yml"},
+			},
+			queryOpts: promql.LazyLoaderOpts{
+				EnableNegativeOffset: true,
+			},
+			want: 0,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := RulesUnitTest(tt.queryOpts, tt.args.files...); got != tt.want {
+			if got := RulesUnitTest(tt.queryOpts, nil, tt.args.files...); got != tt.want {
+				t.Errorf("RulesUnitTest() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestRulesUnitTestRun(t *testing.T) {
+	type args struct {
+		run   []string
+		files []string
+	}
+	tests := []struct {
+		name      string
+		args      args
+		queryOpts promql.LazyLoaderOpts
+		want      int
+	}{
+		{
+			name: "Test all without run arg",
+			args: args{
+				run:   nil,
+				files: []string{"./testdata/rules_run.yml"},
+			},
+			want: 1,
+		},
+		{
+			name: "Test all with run arg",
+			args: args{
+				run:   []string{"correct", "wrong"},
+				files: []string{"./testdata/rules_run.yml"},
+			},
+			want: 1,
+		},
+		{
+			name: "Test correct",
+			args: args{
+				run:   []string{"correct"},
+				files: []string{"./testdata/rules_run.yml"},
+			},
+			want: 0,
+		},
+		{
+			name: "Test wrong",
+			args: args{
+				run:   []string{"wrong"},
+				files: []string{"./testdata/rules_run.yml"},
+			},
+			want: 1,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := RulesUnitTest(tt.queryOpts, tt.args.run, tt.args.files...); got != tt.want {
 				t.Errorf("RulesUnitTest() = %v, want %v", got, tt.want)
 			}
 		})

config/config.go

@@ -19,6 +19,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"sort"
 	"strings"
 	"time"
 
@@ -34,6 +35,7 @@ import (
 	"github.com/prometheus/prometheus/discovery"
 	"github.com/prometheus/prometheus/model/labels"
 	"github.com/prometheus/prometheus/model/relabel"
+	"github.com/prometheus/prometheus/storage/remote/azuread"
 )
 
 var (
@@ -142,17 +144,21 @@ var (
 		ScrapeInterval:     model.Duration(1 * time.Minute),
 		ScrapeTimeout:      model.Duration(10 * time.Second),
 		EvaluationInterval: model.Duration(1 * time.Minute),
+		// When native histogram feature flag is enabled, ScrapeProtocols default
+		// changes to DefaultNativeHistogramScrapeProtocols.
+		ScrapeProtocols: DefaultScrapeProtocols,
 	}
 
 	// DefaultScrapeConfig is the default scrape configuration.
 	DefaultScrapeConfig = ScrapeConfig{
-		// ScrapeTimeout and ScrapeInterval default to the
-		// configured globals.
-		MetricsPath:      "/metrics",
-		Scheme:           "http",
-		HonorLabels:      false,
-		HonorTimestamps:  true,
-		HTTPClientConfig: config.DefaultHTTPClientConfig,
+		// ScrapeTimeout, ScrapeInterval and ScrapeProtocols default to the configured globals.
+		ScrapeClassicHistograms: false,
+		MetricsPath:             "/metrics",
+		Scheme:                  "http",
+		HonorLabels:             false,
+		HonorTimestamps:         true,
+		HTTPClientConfig:        config.DefaultHTTPClientConfig,
+		EnableCompression:       true,
 	}
 
 	// DefaultAlertmanagerConfig is the default alertmanager configuration.
@@ -258,7 +264,7 @@ func (c Config) String() string {
 	return string(b)
 }
 
-// ScrapeConfigs returns the scrape configurations.
+// GetScrapeConfigs returns the scrape configurations.
 func (c *Config) GetScrapeConfigs() ([]*ScrapeConfig, error) {
 	scfgs := make([]*ScrapeConfig, len(c.ScrapeConfigs))
 
@@ -266,7 +272,7 @@ func (c *Config) GetScrapeConfigs() ([]*ScrapeConfig, error) {
 	for i, scfg := range c.ScrapeConfigs {
 		// We do these checks for library users that would not call Validate in
 		// Unmarshal.
-		if err := scfg.Validate(c.GlobalConfig.ScrapeInterval, c.GlobalConfig.ScrapeTimeout); err != nil {
+		if err := scfg.Validate(c.GlobalConfig); err != nil {
 			return nil, err
 		}
 
@@ -293,7 +299,7 @@ func (c *Config) GetScrapeConfigs() ([]*ScrapeConfig, error) {
 				return nil, fileErr(filename, err)
 			}
 			for _, scfg := range cfg.ScrapeConfigs {
-				if err := scfg.Validate(c.GlobalConfig.ScrapeInterval, c.GlobalConfig.ScrapeTimeout); err != nil {
+				if err := scfg.Validate(c.GlobalConfig); err != nil {
 					return nil, fileErr(filename, err)
 				}
 
@@ -342,7 +348,7 @@ func (c *Config) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	// Do global overrides and validate unique names.
 	jobNames := map[string]struct{}{}
 	for _, scfg := range c.ScrapeConfigs {
-		if err := scfg.Validate(c.GlobalConfig.ScrapeInterval, c.GlobalConfig.ScrapeTimeout); err != nil {
+		if err := scfg.Validate(c.GlobalConfig); err != nil {
 			return err
 		}
 
@@ -383,12 +389,107 @@ type GlobalConfig struct {
 	ScrapeInterval model.Duration `yaml:"scrape_interval,omitempty"`
 	// The default timeout when scraping targets.
 	ScrapeTimeout model.Duration `yaml:"scrape_timeout,omitempty"`
+	// The protocols to negotiate during a scrape. It tells clients what
+	// protocol are accepted by Prometheus and with what weight (most wanted is first).
+	// Supported values (case sensitive): PrometheusProto, OpenMetricsText0.0.1,
+	// OpenMetricsText1.0.0, PrometheusText0.0.4.
+	ScrapeProtocols []ScrapeProtocol `yaml:"scrape_protocols,omitempty"`
 	// How frequently to evaluate rules by default.
 	EvaluationInterval model.Duration `yaml:"evaluation_interval,omitempty"`
 	// File to which PromQL queries are logged.
 	QueryLogFile string `yaml:"query_log_file,omitempty"`
 	// The labels to add to any timeseries that this Prometheus instance scrapes.
 	ExternalLabels labels.Labels `yaml:"external_labels,omitempty"`
+	// An uncompressed response body larger than this many bytes will cause the
+	// scrape to fail. 0 means no limit.
+	BodySizeLimit units.Base2Bytes `yaml:"body_size_limit,omitempty"`
+	// More than this many samples post metric-relabeling will cause the scrape to
+	// fail. 0 means no limit.
+	SampleLimit uint `yaml:"sample_limit,omitempty"`
+	// More than this many targets after the target relabeling will cause the
+	// scrapes to fail. 0 means no limit.
+	TargetLimit uint `yaml:"target_limit,omitempty"`
+	// More than this many labels post metric-relabeling will cause the scrape to
+	// fail. 0 means no limit.
+	LabelLimit uint `yaml:"label_limit,omitempty"`
+	// More than this label name length post metric-relabeling will cause the
+	// scrape to fail. 0 means no limit.
+	LabelNameLengthLimit uint `yaml:"label_name_length_limit,omitempty"`
+	// More than this label value length post metric-relabeling will cause the
+	// scrape to fail. 0 means no limit.
+	LabelValueLengthLimit uint `yaml:"label_value_length_limit,omitempty"`
+	// Keep no more than this many dropped targets per job.
+	// 0 means no limit.
+	KeepDroppedTargets uint `yaml:"keep_dropped_targets,omitempty"`
+}
+
+// ScrapeProtocol represents supported protocol for scraping metrics.
+type ScrapeProtocol string
+
+// Validate returns error if given scrape protocol is not supported.
+func (s ScrapeProtocol) Validate() error {
+	if _, ok := ScrapeProtocolsHeaders[s]; !ok {
+		return fmt.Errorf("unknown scrape protocol %v, supported: %v",
+			s, func() (ret []string) {
+				for k := range ScrapeProtocolsHeaders {
+					ret = append(ret, string(k))
+				}
+				sort.Strings(ret)
+				return ret
+			}())
+	}
+	return nil
+}
+
+var (
+	PrometheusProto      ScrapeProtocol = "PrometheusProto"
+	PrometheusText0_0_4  ScrapeProtocol = "PrometheusText0.0.4"
+	OpenMetricsText0_0_1 ScrapeProtocol = "OpenMetricsText0.0.1"
+	OpenMetricsText1_0_0 ScrapeProtocol = "OpenMetricsText1.0.0"
+
+	ScrapeProtocolsHeaders = map[ScrapeProtocol]string{
+		PrometheusProto:      "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited",
+		PrometheusText0_0_4:  "text/plain;version=0.0.4",
+		OpenMetricsText0_0_1: "application/openmetrics-text;version=0.0.1",
+		OpenMetricsText1_0_0: "application/openmetrics-text;version=1.0.0",
+	}
+
+	// DefaultScrapeProtocols is the set of scrape protocols that will be proposed
+	// to scrape target, ordered by priority.
+	DefaultScrapeProtocols = []ScrapeProtocol{
+		OpenMetricsText1_0_0,
+		OpenMetricsText0_0_1,
+		PrometheusText0_0_4,
+	}
+
+	// DefaultProtoFirstScrapeProtocols is like DefaultScrapeProtocols, but it
+	// favors protobuf Prometheus exposition format.
+	// Used by default for certain feature-flags like
+	// "native-histograms" and "created-timestamp-zero-ingestion".
+	DefaultProtoFirstScrapeProtocols = []ScrapeProtocol{
+		PrometheusProto,
+		OpenMetricsText1_0_0,
+		OpenMetricsText0_0_1,
+		PrometheusText0_0_4,
+	}
+)
+
+// validateAcceptScrapeProtocols return errors if we see problems with accept scrape protocols option.
+func validateAcceptScrapeProtocols(sps []ScrapeProtocol) error {
+	if len(sps) == 0 {
+		return errors.New("scrape_protocols cannot be empty")
+	}
+	dups := map[string]struct{}{}
+	for _, sp := range sps {
+		if _, ok := dups[strings.ToLower(string(sp))]; ok {
+			return fmt.Errorf("duplicated protocol in scrape_protocols, got %v", sps)
+		}
+		if err := sp.Validate(); err != nil {
+			return fmt.Errorf("scrape_protocols: %w", err)
+		}
+		dups[strings.ToLower(string(sp))] = struct{}{}
+	}
+	return nil
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -436,6 +537,14 @@ func (c *GlobalConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	if gc.EvaluationInterval == 0 {
 		gc.EvaluationInterval = DefaultGlobalConfig.EvaluationInterval
 	}
+
+	if gc.ScrapeProtocols == nil {
+		gc.ScrapeProtocols = DefaultGlobalConfig.ScrapeProtocols
+	}
+	if err := validateAcceptScrapeProtocols(gc.ScrapeProtocols); err != nil {
+		return fmt.Errorf("%w for global config", err)
+	}
+
 	*c = *gc
 	return nil
 }
@@ -446,7 +555,8 @@ func (c *GlobalConfig) isZero() bool {
 		c.ScrapeInterval == 0 &&
 		c.ScrapeTimeout == 0 &&
 		c.EvaluationInterval == 0 &&
-		c.QueryLogFile == ""
+		c.QueryLogFile == "" &&
+		c.ScrapeProtocols == nil
 }
 
 type ScrapeConfigs struct {
@@ -461,34 +571,51 @@ type ScrapeConfig struct {
 	HonorLabels bool `yaml:"honor_labels,omitempty"`
 	// Indicator whether the scraped timestamps should be respected.
 	HonorTimestamps bool `yaml:"honor_timestamps"`
+	// Indicator whether to track the staleness of the scraped timestamps.
+	TrackTimestampsStaleness bool `yaml:"track_timestamps_staleness"`
 	// A set of query parameters with which the target is scraped.
 	Params url.Values `yaml:"params,omitempty"`
 	// How frequently to scrape the targets of this scrape config.
 	ScrapeInterval model.Duration `yaml:"scrape_interval,omitempty"`
 	// The timeout for scraping targets of this config.
 	ScrapeTimeout model.Duration `yaml:"scrape_timeout,omitempty"`
+	// The protocols to negotiate during a scrape. It tells clients what
+	// protocol are accepted by Prometheus and with what preference (most wanted is first).
+	// Supported values (case sensitive): PrometheusProto, OpenMetricsText0.0.1,
+	// OpenMetricsText1.0.0, PrometheusText0.0.4.
+	ScrapeProtocols []ScrapeProtocol `yaml:"scrape_protocols,omitempty"`
+	// Whether to scrape a classic histogram that is also exposed as a native histogram.
+	ScrapeClassicHistograms bool `yaml:"scrape_classic_histograms,omitempty"`
 	// The HTTP resource path on which to fetch metrics from targets.
 	MetricsPath string `yaml:"metrics_path,omitempty"`
 	// The URL scheme with which to fetch metrics from targets.
 	Scheme string `yaml:"scheme,omitempty"`
+	// Indicator whether to request compressed response from the target.
+	EnableCompression bool `yaml:"enable_compression"`
 	// An uncompressed response body larger than this many bytes will cause the
 	// scrape to fail. 0 means no limit.
 	BodySizeLimit units.Base2Bytes `yaml:"body_size_limit,omitempty"`
 	// More than this many samples post metric-relabeling will cause the scrape to
-	// fail.
+	// fail. 0 means no limit.
 	SampleLimit uint `yaml:"sample_limit,omitempty"`
 	// More than this many targets after the target relabeling will cause the
-	// scrapes to fail.
+	// scrapes to fail. 0 means no limit.
 	TargetLimit uint `yaml:"target_limit,omitempty"`
 	// More than this many labels post metric-relabeling will cause the scrape to
-	// fail.
+	// fail. 0 means no limit.
 	LabelLimit uint `yaml:"label_limit,omitempty"`
 	// More than this label name length post metric-relabeling will cause the
-	// scrape to fail.
+	// scrape to fail. 0 means no limit.
 	LabelNameLengthLimit uint `yaml:"label_name_length_limit,omitempty"`
 	// More than this label value length post metric-relabeling will cause the
-	// scrape to fail.
+	// scrape to fail. 0 means no limit.
 	LabelValueLengthLimit uint `yaml:"label_value_length_limit,omitempty"`
+	// More than this many buckets in a native histogram will cause the scrape to
+	// fail.
+	NativeHistogramBucketLimit uint `yaml:"native_histogram_bucket_limit,omitempty"`
+	// Keep no more than this many dropped targets per job.
+	// 0 means no limit.
+	KeepDroppedTargets uint `yaml:"keep_dropped_targets,omitempty"`
 
 	// We cannot do proper Go type embedding below as the parser will then parse
 	// values arbitrarily into the overflow maps of further-down types.
@@ -546,25 +673,55 @@ func (c *ScrapeConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	return nil
 }
 
-func (c *ScrapeConfig) Validate(defaultInterval, defaultTimeout model.Duration) error {
+// Validate validates scrape config, but also fills relevant default values from global config if needed.
+func (c *ScrapeConfig) Validate(globalConfig GlobalConfig) error {
 	if c == nil {
 		return errors.New("empty or null scrape config section")
 	}
 	// First set the correct scrape interval, then check that the timeout
 	// (inferred or explicit) is not greater than that.
 	if c.ScrapeInterval == 0 {
-		c.ScrapeInterval = defaultInterval
+		c.ScrapeInterval = globalConfig.ScrapeInterval
 	}
 	if c.ScrapeTimeout > c.ScrapeInterval {
 		return fmt.Errorf("scrape timeout greater than scrape interval for scrape config with job name %q", c.JobName)
 	}
 	if c.ScrapeTimeout == 0 {
-		if defaultTimeout > c.ScrapeInterval {
+		if globalConfig.ScrapeTimeout > c.ScrapeInterval {
 			c.ScrapeTimeout = c.ScrapeInterval
 		} else {
-			c.ScrapeTimeout = defaultTimeout
+			c.ScrapeTimeout = globalConfig.ScrapeTimeout
 		}
 	}
+	if c.BodySizeLimit == 0 {
+		c.BodySizeLimit = globalConfig.BodySizeLimit
+	}
+	if c.SampleLimit == 0 {
+		c.SampleLimit = globalConfig.SampleLimit
+	}
+	if c.TargetLimit == 0 {
+		c.TargetLimit = globalConfig.TargetLimit
+	}
+	if c.LabelLimit == 0 {
+		c.LabelLimit = globalConfig.LabelLimit
+	}
+	if c.LabelNameLengthLimit == 0 {
+		c.LabelNameLengthLimit = globalConfig.LabelNameLengthLimit
+	}
+	if c.LabelValueLengthLimit == 0 {
+		c.LabelValueLengthLimit = globalConfig.LabelValueLengthLimit
+	}
+	if c.KeepDroppedTargets == 0 {
+		c.KeepDroppedTargets = globalConfig.KeepDroppedTargets
+	}
+
+	if c.ScrapeProtocols == nil {
+		c.ScrapeProtocols = globalConfig.ScrapeProtocols
+	}
+	if err := validateAcceptScrapeProtocols(c.ScrapeProtocols); err != nil {
+		return fmt.Errorf("%w for scrape config with job name %q", err, c.JobName)
+	}
+
 	return nil
 }
 
@@ -766,6 +923,7 @@ type AlertmanagerConfig struct {
 
 	ServiceDiscoveryConfigs discovery.Configs       `yaml:"-"`
 	HTTPClientConfig        config.HTTPClientConfig `yaml:",inline"`
+	SigV4Config             *sigv4.SigV4Config      `yaml:"sigv4,omitempty"`
 
 	// The URL scheme to use when talking to Alertmanagers.
 	Scheme string `yaml:"scheme,omitempty"`
@@ -801,6 +959,13 @@ func (c *AlertmanagerConfig) UnmarshalYAML(unmarshal func(interface{}) error) er
 		return err
 	}
 
+	httpClientConfigAuthEnabled := c.HTTPClientConfig.BasicAuth != nil ||
+		c.HTTPClientConfig.Authorization != nil || c.HTTPClientConfig.OAuth2 != nil
+
+	if httpClientConfigAuthEnabled && c.SigV4Config != nil {
+		return fmt.Errorf("at most one of basic_auth, authorization, oauth2, & sigv4 must be configured")
+	}
+
 	// Check for users putting URLs in target groups.
 	if len(c.RelabelConfigs) == 0 {
 		if err := checkStaticTargets(c.ServiceDiscoveryConfigs); err != nil {
@@ -865,6 +1030,7 @@ type RemoteWriteConfig struct {
 	QueueConfig      QueueConfig             `yaml:"queue_config,omitempty"`
 	MetadataConfig   MetadataConfig          `yaml:"metadata_config,omitempty"`
 	SigV4Config      *sigv4.SigV4Config      `yaml:"sigv4,omitempty"`
+	AzureADConfig    *azuread.AzureADConfig  `yaml:"azuread,omitempty"`
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -901,8 +1067,12 @@ func (c *RemoteWriteConfig) UnmarshalYAML(unmarshal func(interface{}) error) err
 	httpClientConfigAuthEnabled := c.HTTPClientConfig.BasicAuth != nil ||
 		c.HTTPClientConfig.Authorization != nil || c.HTTPClientConfig.OAuth2 != nil
 
-	if httpClientConfigAuthEnabled && c.SigV4Config != nil {
-		return fmt.Errorf("at most one of basic_auth, authorization, oauth2, & sigv4 must be configured")
+	if httpClientConfigAuthEnabled && (c.SigV4Config != nil || c.AzureADConfig != nil) {
+		return fmt.Errorf("at most one of basic_auth, authorization, oauth2, sigv4, & azuread must be configured")
+	}
+
+	if c.SigV4Config != nil && c.AzureADConfig != nil {
+		return fmt.Errorf("at most one of basic_auth, authorization, oauth2, sigv4, & azuread must be configured")
 	}
 
 	return nil
@@ -923,7 +1093,7 @@ func validateHeadersForTracing(headers map[string]string) error {
 func validateHeaders(headers map[string]string) error {
 	for header := range headers {
 		if strings.ToLower(header) == "authorization" {
-			return errors.New("authorization header must be changed via the basic_auth, authorization, oauth2, or sigv4 parameter")
+			return errors.New("authorization header must be changed via the basic_auth, authorization, oauth2, sigv4, or azuread parameter")
 		}
 		if _, ok := reservedHeaders[strings.ToLower(header)]; ok {
 			return fmt.Errorf("%s is a reserved header. It must not be changed", header)

config/config_test.go

@@ -68,6 +68,15 @@ func mustParseURL(u string) *config.URL {
 	return &config.URL{URL: parsed}
 }
 
+const (
+	globBodySizeLimit         = 15 * units.MiB
+	globSampleLimit           = 1500
+	globTargetLimit           = 30
+	globLabelLimit            = 30
+	globLabelNameLengthLimit  = 200
+	globLabelValueLengthLimit = 200
+)
+
 var expectedConf = &Config{
 	GlobalConfig: GlobalConfig{
 		ScrapeInterval:     model.Duration(15 * time.Second),
@@ -76,6 +85,14 @@ var expectedConf = &Config{
 		QueryLogFile:       "",
 
 		ExternalLabels: labels.FromStrings("foo", "bar", "monitor", "codelab"),
+
+		BodySizeLimit:         globBodySizeLimit,
+		SampleLimit:           globSampleLimit,
+		TargetLimit:           globTargetLimit,
+		LabelLimit:            globLabelLimit,
+		LabelNameLengthLimit:  globLabelNameLengthLimit,
+		LabelValueLengthLimit: globLabelValueLengthLimit,
+		ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 	},
 
 	RuleFiles: []string{
@@ -165,10 +182,18 @@ var expectedConf = &Config{
 		{
 			JobName: "prometheus",
 
-			HonorLabels:     true,
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorLabels:           true,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath: DefaultScrapeConfig.MetricsPath,
 			Scheme:      DefaultScrapeConfig.Scheme,
@@ -261,11 +286,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-x",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(50 * time.Second),
-			ScrapeTimeout:   model.Duration(5 * time.Second),
-			BodySizeLimit:   10 * units.MiB,
-			SampleLimit:     1000,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(50 * time.Second),
+			ScrapeTimeout:         model.Duration(5 * time.Second),
+			EnableCompression:     true,
+			BodySizeLimit:         10 * units.MiB,
+			SampleLimit:           1000,
+			TargetLimit:           35,
+			LabelLimit:            35,
+			LabelNameLengthLimit:  210,
+			LabelValueLengthLimit: 210,
+			ScrapeProtocols:       []ScrapeProtocol{PrometheusText0_0_4},
 
 			HTTPClientConfig: config.HTTPClientConfig{
 				BasicAuth: &config.BasicAuth{
@@ -352,9 +383,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-y",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -363,6 +402,7 @@ var expectedConf = &Config{
 			ServiceDiscoveryConfigs: discovery.Configs{
 				&consul.SDConfig{
 					Server:          "localhost:1234",
+					PathPrefix:      "/consul",
 					Token:           "mysecret",
 					Services:        []string{"nginx", "cache", "mysql"},
 					ServiceTags:     []string{"canary", "v1"},
@@ -398,9 +438,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-z",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   model.Duration(10 * time.Second),
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         model.Duration(10 * time.Second),
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath: "/metrics",
 			Scheme:      "http",
@@ -423,9 +471,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-kubernetes",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -454,9 +510,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-kubernetes-namespaces",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath: DefaultScrapeConfig.MetricsPath,
 			Scheme:      DefaultScrapeConfig.Scheme,
@@ -485,9 +549,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-kuma",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -496,6 +568,7 @@ var expectedConf = &Config{
 			ServiceDiscoveryConfigs: discovery.Configs{
 				&xds.KumaSDConfig{
 					Server:           "http://kuma-control-plane.kuma-system.svc:5676",
+					ClientID:         "main-prometheus",
 					HTTPClientConfig: config.DefaultHTTPClientConfig,
 					RefreshInterval:  model.Duration(15 * time.Second),
 					FetchTimeout:     model.Duration(2 * time.Minute),
@@ -505,9 +578,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-marathon",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -534,9 +615,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-nomad",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -560,9 +649,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-ec2",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -593,9 +690,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-lightsail",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -616,9 +721,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-azure",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -642,9 +755,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-nerve",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -661,9 +782,17 @@ var expectedConf = &Config{
 		{
 			JobName: "0123service-xxx",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -683,9 +812,17 @@ var expectedConf = &Config{
 		{
 			JobName: "badfederation",
 
-			HonorTimestamps: false,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       false,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      "/federate",
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -705,9 +842,17 @@ var expectedConf = &Config{
 		{
 			JobName: "測試",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -727,9 +872,17 @@ var expectedConf = &Config{
 		{
 			JobName: "httpsd",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -746,9 +899,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-triton",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -773,9 +934,17 @@ var expectedConf = &Config{
 		{
 			JobName: "digitalocean-droplets",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -799,9 +968,17 @@ var expectedConf = &Config{
 		{
 			JobName: "docker",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -821,9 +998,17 @@ var expectedConf = &Config{
 		{
 			JobName: "dockerswarm",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -843,9 +1028,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-openstack",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -869,9 +1062,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-puppetdb",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -897,10 +1098,18 @@ var expectedConf = &Config{
 			},
 		},
 		{
-			JobName:         "hetzner",
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			JobName:               "hetzner",
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -946,9 +1155,17 @@ var expectedConf = &Config{
 		{
 			JobName: "service-eureka",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -965,9 +1182,18 @@ var expectedConf = &Config{
 		{
 			JobName: "ovhcloud",
 
-			HonorTimestamps:  true,
-			ScrapeInterval:   model.Duration(15 * time.Second),
-			ScrapeTimeout:    DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
+
 			HTTPClientConfig: config.DefaultHTTPClientConfig,
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -994,9 +1220,18 @@ var expectedConf = &Config{
 		{
 			JobName: "scaleway",
 
-			HonorTimestamps:  true,
-			ScrapeInterval:   model.Duration(15 * time.Second),
-			ScrapeTimeout:    DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
+
 			HTTPClientConfig: config.DefaultHTTPClientConfig,
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -1029,9 +1264,17 @@ var expectedConf = &Config{
 		{
 			JobName: "linode-instances",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -1056,9 +1299,18 @@ var expectedConf = &Config{
 		{
 			JobName: "uyuni",
 
-			HonorTimestamps:  true,
-			ScrapeInterval:   model.Duration(15 * time.Second),
-			ScrapeTimeout:    DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
+
 			HTTPClientConfig: config.DefaultHTTPClientConfig,
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -1075,10 +1327,18 @@ var expectedConf = &Config{
 			},
 		},
 		{
-			JobName:         "ionos",
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			JobName:               "ionos",
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -1100,9 +1360,17 @@ var expectedConf = &Config{
 		{
 			JobName: "vultr",
 
-			HonorTimestamps: true,
-			ScrapeInterval:  model.Duration(15 * time.Second),
-			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+			HonorTimestamps:       true,
+			ScrapeInterval:        model.Duration(15 * time.Second),
+			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			EnableCompression:     true,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+			ScrapeProtocols:       DefaultGlobalConfig.ScrapeProtocols,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -1190,8 +1458,8 @@ func TestRemoteWriteRetryOnRateLimit(t *testing.T) {
 	got := &Config{}
 	require.NoError(t, yaml.UnmarshalStrict(out, got))
 
-	require.Equal(t, true, got.RemoteWriteConfigs[0].QueueConfig.RetryOnRateLimit)
-	require.Equal(t, false, got.RemoteWriteConfigs[1].QueueConfig.RetryOnRateLimit)
+	require.True(t, got.RemoteWriteConfigs[0].QueueConfig.RetryOnRateLimit)
+	require.False(t, got.RemoteWriteConfigs[1].QueueConfig.RetryOnRateLimit)
 }
 
 func TestLoadConfig(t *testing.T) {
@@ -1208,9 +1476,9 @@ func TestLoadConfig(t *testing.T) {
 func TestScrapeIntervalLarger(t *testing.T) {
 	c, err := LoadFile("testdata/scrape_interval_larger.good.yml", false, false, log.NewNopLogger())
 	require.NoError(t, err)
-	require.Equal(t, 1, len(c.ScrapeConfigs))
+	require.Len(t, c.ScrapeConfigs, 1)
 	for _, sc := range c.ScrapeConfigs {
-		require.Equal(t, true, sc.ScrapeInterval >= sc.ScrapeTimeout)
+		require.GreaterOrEqual(t, sc.ScrapeInterval, sc.ScrapeTimeout)
 	}
 }
 
@@ -1226,7 +1494,7 @@ func TestElideSecrets(t *testing.T) {
 	yamlConfig := string(config)
 
 	matches := secretRe.FindAllStringIndex(yamlConfig, -1)
-	require.Equal(t, 22, len(matches), "wrong number of secret matches found")
+	require.Len(t, matches, 22, "wrong number of secret matches found")
 	require.NotContains(t, yamlConfig, "mysecret",
 		"yaml marshal reveals authentication credentials.")
 }
@@ -1523,7 +1791,7 @@ var expectedErrors = []struct {
 	},
 	{
 		filename: "remote_write_authorization_header.bad.yml",
-		errMsg:   `authorization header must be changed via the basic_auth, authorization, oauth2, or sigv4 parameter`,
+		errMsg:   `authorization header must be changed via the basic_auth, authorization, oauth2, sigv4, or azuread parameter`,
 	},
 	{
 		filename: "remote_write_url_missing.bad.yml",
@@ -1541,6 +1809,14 @@ var expectedErrors = []struct {
 		filename: "ec2_filters_empty_values.bad.yml",
 		errMsg:   `EC2 SD configuration filter values cannot be empty`,
 	},
+	{
+		filename: "ec2_token_file.bad.yml",
+		errMsg:   `at most one of bearer_token & bearer_token_file must be configured`,
+	},
+	{
+		filename: "lightsail_token_file.bad.yml",
+		errMsg:   `at most one of bearer_token & bearer_token_file must be configured`,
+	},
 	{
 		filename: "section_key_dup.bad.yml",
 		errMsg:   "field scrape_configs already set in type config.plain",
@@ -1565,6 +1841,10 @@ var expectedErrors = []struct {
 		filename: "azure_authentication_method.bad.yml",
 		errMsg:   "unknown authentication_type \"invalid\". Supported types are \"OAuth\" or \"ManagedIdentity\"",
 	},
+	{
+		filename: "azure_bearertoken_basicauth.bad.yml",
+		errMsg:   "at most one of basic_auth, oauth2, bearer_token & bearer_token_file must be configured",
+	},
 	{
 		filename: "empty_scrape_config.bad.yml",
 		errMsg:   "empty or null scrape config section",
@@ -1617,6 +1897,10 @@ var expectedErrors = []struct {
 		filename: "puppetdb_no_scheme.bad.yml",
 		errMsg:   "URL scheme must be 'http' or 'https'",
 	},
+	{
+		filename: "puppetdb_token_file.bad.yml",
+		errMsg:   "at most one of bearer_token & bearer_token_file must be configured",
+	},
 	{
 		filename: "hetzner_role.bad.yml",
 		errMsg:   "unknown role",
@@ -1653,6 +1937,10 @@ var expectedErrors = []struct {
 		filename: "http_url_no_host.bad.yml",
 		errMsg:   "host is missing in URL",
 	},
+	{
+		filename: "http_token_file.bad.yml",
+		errMsg:   "at most one of bearer_token & bearer_token_file must be configured",
+	},
 	{
 		filename: "http_url_bad_scheme.bad.yml",
 		errMsg:   "URL scheme must be 'http' or 'https'",
@@ -1681,6 +1969,10 @@ var expectedErrors = []struct {
 		filename: "uyuni_no_server.bad.yml",
 		errMsg:   "Uyuni SD configuration requires server host",
 	},
+	{
+		filename: "uyuni_token_file.bad.yml",
+		errMsg:   "at most one of bearer_token & bearer_token_file must be configured",
+	},
 	{
 		filename: "ionos_datacenter.bad.yml",
 		errMsg:   "datacenter id can't be empty",
@@ -1697,6 +1989,14 @@ var expectedErrors = []struct {
 		filename: "scrape_config_files_glob.bad.yml",
 		errMsg:   `parsing YAML file testdata/scrape_config_files_glob.bad.yml: invalid scrape config file path "scrape_configs/*/*"`,
 	},
+	{
+		filename: "scrape_config_files_scrape_protocols.bad.yml",
+		errMsg:   `parsing YAML file testdata/scrape_config_files_scrape_protocols.bad.yml: scrape_protocols: unknown scrape protocol prometheusproto, supported: [OpenMetricsText0.0.1 OpenMetricsText1.0.0 PrometheusProto PrometheusText0.0.4] for scrape config with job name "node"`,
+	},
+	{
+		filename: "scrape_config_files_scrape_protocols2.bad.yml",
+		errMsg:   `parsing YAML file testdata/scrape_config_files_scrape_protocols2.bad.yml: duplicated protocol in scrape_protocols, got [OpenMetricsText1.0.0 PrometheusProto OpenMetricsText1.0.0] for scrape config with job name "node"`,
+	},
 }
 
 func TestBadConfigs(t *testing.T) {
@@ -1764,7 +2064,7 @@ func TestAgentMode(t *testing.T) {
 
 	c, err := LoadFile("testdata/agent_mode.without_remote_writes.yml", true, false, log.NewNopLogger())
 	require.NoError(t, err)
-	require.Len(t, c.RemoteWriteConfigs, 0)
+	require.Empty(t, c.RemoteWriteConfigs)
 
 	c, err = LoadFile("testdata/agent_mode.good.yml", true, false, log.NewNopLogger())
 	require.NoError(t, err)
@@ -1786,13 +2086,16 @@ func TestEmptyGlobalBlock(t *testing.T) {
 func TestGetScrapeConfigs(t *testing.T) {
 	sc := func(jobName string, scrapeInterval, scrapeTimeout model.Duration) *ScrapeConfig {
 		return &ScrapeConfig{
-			JobName:          jobName,
-			HonorTimestamps:  true,
-			ScrapeInterval:   scrapeInterval,
-			ScrapeTimeout:    scrapeTimeout,
-			MetricsPath:      "/metrics",
-			Scheme:           "http",
-			HTTPClientConfig: config.DefaultHTTPClientConfig,
+			JobName:         jobName,
+			HonorTimestamps: true,
+			ScrapeInterval:  scrapeInterval,
+			ScrapeTimeout:   scrapeTimeout,
+			ScrapeProtocols: DefaultGlobalConfig.ScrapeProtocols,
+
+			MetricsPath:       "/metrics",
+			Scheme:            "http",
+			EnableCompression: true,
+			HTTPClientConfig:  config.DefaultHTTPClientConfig,
 			ServiceDiscoveryConfigs: discovery.Configs{
 				discovery.StaticConfig{
 					{
@@ -1843,10 +2146,13 @@ func TestGetScrapeConfigs(t *testing.T) {
 					HonorTimestamps: true,
 					ScrapeInterval:  model.Duration(60 * time.Second),
 					ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+					ScrapeProtocols: DefaultGlobalConfig.ScrapeProtocols,
 
 					MetricsPath: DefaultScrapeConfig.MetricsPath,
 					Scheme:      DefaultScrapeConfig.Scheme,
 
+					EnableCompression: true,
+
 					HTTPClientConfig: config.HTTPClientConfig{
 						TLSConfig: config.TLSConfig{
 							CertFile: filepath.FromSlash("testdata/scrape_configs/valid_cert_file"),
@@ -1873,6 +2179,8 @@ func TestGetScrapeConfigs(t *testing.T) {
 					HonorTimestamps: true,
 					ScrapeInterval:  model.Duration(15 * time.Second),
 					ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+					ScrapeProtocols: DefaultGlobalConfig.ScrapeProtocols,
+
 					HTTPClientConfig: config.HTTPClientConfig{
 						TLSConfig: config.TLSConfig{
 							CertFile: filepath.FromSlash("testdata/valid_cert_file"),
@@ -1885,6 +2193,8 @@ func TestGetScrapeConfigs(t *testing.T) {
 					MetricsPath: DefaultScrapeConfig.MetricsPath,
 					Scheme:      DefaultScrapeConfig.Scheme,
 
+					EnableCompression: true,
+
 					ServiceDiscoveryConfigs: discovery.Configs{
 						&vultr.SDConfig{
 							HTTPClientConfig: config.HTTPClientConfig{
@@ -1937,3 +2247,16 @@ func kubernetesSDHostURL() config.URL {
 	tURL, _ := url.Parse("https://localhost:1234")
 	return config.URL{URL: tURL}
 }
+
+func TestScrapeConfigDisableCompression(t *testing.T) {
+	want, err := LoadFile("testdata/scrape_config_disable_compression.good.yml", false, false, log.NewNopLogger())
+	require.NoError(t, err)
+
+	out, err := yaml.Marshal(want)
+
+	require.NoError(t, err)
+	got := &Config{}
+	require.NoError(t, yaml.UnmarshalStrict(out, got))
+
+	require.False(t, got.ScrapeConfigs[0].EnableCompression)
+}

config/testdata/azure_bearertoken_basicauth.bad.yml

@@ -0,0 +1,11 @@
+scrape_configs:
+  - job_name: prometheus
+    azure_sd_configs:
+      - subscription_id: 11AAAA11-A11A-111A-A111-1111A1111A11
+        tenant_id: BBBB222B-B2B2-2B22-B222-2BB2222BB2B2
+        client_id: 333333CC-3C33-3333-CCC3-33C3CCCCC33C
+        client_secret: mysecret
+        bearer_token: 1234
+        basic_auth:
+          username: user
+          password: password

config/testdata/conf.good.yml

@@ -2,6 +2,12 @@
 global:
   scrape_interval: 15s
   evaluation_interval: 30s
+  body_size_limit: 15MB
+  sample_limit: 1500
+  target_limit: 30
+  label_limit: 30
+  label_name_length_limit: 200
+  label_value_length_limit: 200
   # scrape_timeout is set to the global default (10s).
 
   external_labels:
@@ -108,9 +114,14 @@ scrape_configs:
 
     scrape_interval: 50s
     scrape_timeout: 5s
+    scrape_protocols: ["PrometheusText0.0.4"]
 
     body_size_limit: 10MB
     sample_limit: 1000
+    target_limit: 35
+    label_limit: 35
+    label_name_length_limit: 210
+    label_value_length_limit: 210
 
     metrics_path: /my_path
     scheme: https
@@ -151,6 +162,7 @@ scrape_configs:
     consul_sd_configs:
       - server: "localhost:1234"
         token: mysecret
+        path_prefix: /consul
         services: ["nginx", "cache", "mysql"]
         tags: ["canary", "v1"]
         node_meta:
@@ -209,6 +221,7 @@ scrape_configs:
 
     kuma_sd_configs:
       - server: http://kuma-control-plane.kuma-system.svc:5676
+        client_id: main-prometheus
 
   - job_name: service-marathon
     marathon_sd_configs:

config/testdata/ec2_token_file.bad.yml

@@ -0,0 +1,6 @@
+scrape_configs:
+  - job_name: foo
+    ec2_sd_configs:
+      - region: us-east-1
+        bearer_token: foo
+        bearer_token_file: foo

config/testdata/http_token_file.bad.yml

@@ -0,0 +1,6 @@
+scrape_configs:
+  - job_name: foo
+    http_sd_configs:
+      - url: http://foo
+        bearer_token: foo
+        bearer_token_file: foo

config/testdata/lightsail_token_file.bad.yml

@@ -0,0 +1,6 @@
+scrape_configs:
+  - job_name: foo
+    lightsail_sd_configs:
+      - region: us-east-1
+        bearer_token: foo
+        bearer_token_file: foo

config/testdata/puppetdb_token_file.bad.yml

@@ -0,0 +1,7 @@
+scrape_configs:
+- job_name: puppetdb
+  puppetdb_sd_configs:
+  - url: http://puppet
+    query: 'resources { type = "Package" and title = "httpd" }'
+    bearer_token: foo
+    bearer_token_file: foo

config/testdata/roundtrip.good.yml

@@ -108,6 +108,7 @@ scrape_configs:
 
     kuma_sd_configs:
       - server: http://kuma-control-plane.kuma-system.svc:5676
+        client_id: main-prometheus
 
     marathon_sd_configs:
       - servers:

config/testdata/scrape_config_disable_compression.good.yml

@@ -0,0 +1,5 @@
+scrape_configs:
+  - job_name: prometheus
+    static_configs:
+      - targets: ['localhost:8080']
+    enable_compression: false

config/testdata/scrape_config_files_scrape_protocols.bad.yml

@@ -0,0 +1,5 @@
+scrape_configs:
+  - job_name: node
+    scrape_protocols: ["prometheusproto"]
+    static_configs:
+      - targets: ['localhost:8080']

config/testdata/scrape_config_files_scrape_protocols2.bad.yml

@@ -0,0 +1,5 @@
+scrape_configs:
+  - job_name: node
+    scrape_protocols: ["OpenMetricsText1.0.0", "PrometheusProto", "OpenMetricsText1.0.0"]
+    static_configs:
+      - targets: ['localhost:8080']

config/testdata/uyuni_token_file.bad.yml

@@ -0,0 +1,8 @@
+scrape_configs:
+  - job_name: uyuni
+    uyuni_sd_configs:
+      - server: "server"
+        username: "username"
+        password: "password"
+        bearer_token: foo
+        bearer_token_file: foo

discovery/README.md

@@ -234,6 +234,11 @@ type Config interface {
 
 type DiscovererOptions struct {
 	Logger log.Logger
+
+	// A registerer for the Discoverer's metrics.
+	Registerer prometheus.Registerer
+	
+	HTTPClientOptions []config.HTTPClientOption
 }
 ```
 

discovery/aws/ec2.go

@@ -30,6 +30,7 @@ import (
 	"github.com/aws/aws-sdk-go/service/ec2"
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 
@@ -101,7 +102,7 @@ func (*EC2SDConfig) Name() string { return "ec2" }
 
 // NewDiscoverer returns a Discoverer for the EC2 Config.
 func (c *EC2SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewEC2Discovery(c, opts.Logger), nil
+	return NewEC2Discovery(c, opts.Logger, opts.Registerer), nil
 }
 
 // UnmarshalYAML implements the yaml.Unmarshaler interface for the EC2 Config.
@@ -129,7 +130,7 @@ func (c *EC2SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 			return errors.New("EC2 SD configuration filter values cannot be empty")
 		}
 	}
-	return nil
+	return c.HTTPClientConfig.Validate()
 }
 
 // EC2Discovery periodically performs EC2-SD requests. It implements
@@ -147,7 +148,7 @@ type EC2Discovery struct {
 }
 
 // NewEC2Discovery returns a new EC2Discovery which periodically refreshes its targets.
-func NewEC2Discovery(conf *EC2SDConfig, logger log.Logger) *EC2Discovery {
+func NewEC2Discovery(conf *EC2SDConfig, logger log.Logger, reg prometheus.Registerer) *EC2Discovery {
 	if logger == nil {
 		logger = log.NewNopLogger()
 	}
@@ -156,10 +157,13 @@ func NewEC2Discovery(conf *EC2SDConfig, logger log.Logger) *EC2Discovery {
 		cfg:    conf,
 	}
 	d.Discovery = refresh.NewDiscovery(
-		logger,
-		"ec2",
-		time.Duration(d.cfg.RefreshInterval),
-		d.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "ec2",
+			Interval: time.Duration(d.cfg.RefreshInterval),
+			RefreshF: d.refresh,
+			Registry: reg,
+		},
 	)
 	return d
 }

discovery/aws/lightsail.go

@@ -29,6 +29,7 @@ import (
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/lightsail"
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 
@@ -84,7 +85,7 @@ func (*LightsailSDConfig) Name() string { return "lightsail" }
 
 // NewDiscoverer returns a Discoverer for the Lightsail Config.
 func (c *LightsailSDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewLightsailDiscovery(c, opts.Logger), nil
+	return NewLightsailDiscovery(c, opts.Logger, opts.Registerer), nil
 }
 
 // UnmarshalYAML implements the yaml.Unmarshaler interface for the Lightsail Config.
@@ -109,7 +110,7 @@ func (c *LightsailSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) err
 		}
 		c.Region = region
 	}
-	return nil
+	return c.HTTPClientConfig.Validate()
 }
 
 // LightsailDiscovery periodically performs Lightsail-SD requests. It implements
@@ -121,7 +122,7 @@ type LightsailDiscovery struct {
 }
 
 // NewLightsailDiscovery returns a new LightsailDiscovery which periodically refreshes its targets.
-func NewLightsailDiscovery(conf *LightsailSDConfig, logger log.Logger) *LightsailDiscovery {
+func NewLightsailDiscovery(conf *LightsailSDConfig, logger log.Logger, reg prometheus.Registerer) *LightsailDiscovery {
 	if logger == nil {
 		logger = log.NewNopLogger()
 	}
@@ -129,10 +130,13 @@ func NewLightsailDiscovery(conf *LightsailSDConfig, logger log.Logger) *Lightsai
 		cfg: conf,
 	}
 	d.Discovery = refresh.NewDiscovery(
-		logger,
-		"lightsail",
-		time.Duration(d.cfg.RefreshInterval),
-		d.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "lightsail",
+			Interval: time.Duration(d.cfg.RefreshInterval),
+			RefreshF: d.refresh,
+			Registry: reg,
+		},
 	)
 	return d
 }

discovery/azure/azure.go

@@ -17,21 +17,28 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"math/rand"
 	"net"
 	"net/http"
 	"strings"
 	"sync"
 	"time"
 
-	"github.com/Azure/azure-sdk-for-go/services/compute/mgmt/2018-10-01/compute"
-	"github.com/Azure/azure-sdk-for-go/services/network/mgmt/2018-10-01/network"
-	"github.com/Azure/go-autorest/autorest"
-	"github.com/Azure/go-autorest/autorest/adal"
-	"github.com/Azure/go-autorest/autorest/azure"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/arm"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/cloud"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/to"
+	"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
+	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v5"
+	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork/v4"
+	cache "github.com/Code-Hex/go-generics-cache"
+	"github.com/Code-Hex/go-generics-cache/policy/lru"
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
 	"github.com/prometheus/client_golang/prometheus"
 	config_util "github.com/prometheus/common/config"
+
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/common/version"
 
@@ -68,21 +75,34 @@ var (
 	DefaultSDConfig = SDConfig{
 		Port:                 80,
 		RefreshInterval:      model.Duration(5 * time.Minute),
-		Environment:          azure.PublicCloud.Name,
+		Environment:          "AzurePublicCloud",
 		AuthenticationMethod: authMethodOAuth,
 		HTTPClientConfig:     config_util.DefaultHTTPClientConfig,
 	}
-
-	failuresCount = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "prometheus_sd_azure_failures_total",
-			Help: "Number of Azure service discovery refresh failures.",
-		})
 )
 
+var environments = map[string]cloud.Configuration{
+	"AZURECHINACLOUD":        cloud.AzureChina,
+	"AZURECLOUD":             cloud.AzurePublic,
+	"AZUREGERMANCLOUD":       cloud.AzurePublic,
+	"AZUREPUBLICCLOUD":       cloud.AzurePublic,
+	"AZUREUSGOVERNMENT":      cloud.AzureGovernment,
+	"AZUREUSGOVERNMENTCLOUD": cloud.AzureGovernment,
+}
+
+// CloudConfigurationFromName returns cloud configuration based on the common name specified.
+func CloudConfigurationFromName(name string) (cloud.Configuration, error) {
+	name = strings.ToUpper(name)
+	env, ok := environments[name]
+	if !ok {
+		return env, fmt.Errorf("there is no cloud configuration matching the name %q", name)
+	}
+
+	return env, nil
+}
+
 func init() {
 	discovery.RegisterConfig(&SDConfig{})
-	prometheus.MustRegister(failuresCount)
 }
 
 // SDConfig is the configuration for Azure based service discovery.
@@ -105,7 +125,7 @@ func (*SDConfig) Name() string { return "azure" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(c, opts.Logger), nil
+	return NewDiscovery(c, opts.Logger, opts.Registerer)
 }
 
 func validateAuthParam(param, name string) error {
@@ -123,7 +143,6 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	if err != nil {
 		return err
 	}
-
 	if err = validateAuthParam(c.SubscriptionID, "subscription_id"); err != nil {
 		return err
 	}
@@ -144,114 +163,143 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		return fmt.Errorf("unknown authentication_type %q. Supported types are %q or %q", c.AuthenticationMethod, authMethodOAuth, authMethodManagedIdentity)
 	}
 
-	return nil
+	return c.HTTPClientConfig.Validate()
 }
 
 type Discovery struct {
 	*refresh.Discovery
-	logger log.Logger
-	cfg    *SDConfig
-	port   int
+	logger        log.Logger
+	cfg           *SDConfig
+	port          int
+	cache         *cache.Cache[string, *armnetwork.Interface]
+	failuresCount prometheus.Counter
+	cacheHitCount prometheus.Counter
 }
 
 // NewDiscovery returns a new AzureDiscovery which periodically refreshes its targets.
-func NewDiscovery(cfg *SDConfig, logger log.Logger) *Discovery {
+func NewDiscovery(cfg *SDConfig, logger log.Logger, reg prometheus.Registerer) (*Discovery, error) {
 	if logger == nil {
 		logger = log.NewNopLogger()
 	}
+	l := cache.New(cache.AsLRU[string, *armnetwork.Interface](lru.WithCapacity(5000)))
 	d := &Discovery{
 		cfg:    cfg,
 		port:   cfg.Port,
 		logger: logger,
+		cache:  l,
+		failuresCount: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Name: "prometheus_sd_azure_failures_total",
+				Help: "Number of Azure service discovery refresh failures.",
+			}),
+		cacheHitCount: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Name: "prometheus_sd_azure_cache_hit_total",
+				Help: "Number of cache hit during refresh.",
+			}),
 	}
+
 	d.Discovery = refresh.NewDiscovery(
-		logger,
-		"azure",
-		time.Duration(cfg.RefreshInterval),
-		d.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "azure",
+			Interval: time.Duration(cfg.RefreshInterval),
+			RefreshF: d.refresh,
+			Registry: reg,
+			Metrics:  []prometheus.Collector{d.failuresCount, d.cacheHitCount},
+		},
 	)
-	return d
+
+	return d, nil
 }
 
 // azureClient represents multiple Azure Resource Manager providers.
 type azureClient struct {
-	nic    network.InterfacesClient
-	vm     compute.VirtualMachinesClient
-	vmss   compute.VirtualMachineScaleSetsClient
-	vmssvm compute.VirtualMachineScaleSetVMsClient
+	nic    *armnetwork.InterfacesClient
+	vm     *armcompute.VirtualMachinesClient
+	vmss   *armcompute.VirtualMachineScaleSetsClient
+	vmssvm *armcompute.VirtualMachineScaleSetVMsClient
+	logger log.Logger
 }
 
 // createAzureClient is a helper function for creating an Azure compute client to ARM.
 func createAzureClient(cfg SDConfig) (azureClient, error) {
-	env, err := azure.EnvironmentFromName(cfg.Environment)
+	cloudConfiguration, err := CloudConfigurationFromName(cfg.Environment)
 	if err != nil {
 		return azureClient{}, err
 	}
 
-	activeDirectoryEndpoint := env.ActiveDirectoryEndpoint
-	resourceManagerEndpoint := env.ResourceManagerEndpoint
-
 	var c azureClient
 
-	var spt *adal.ServicePrincipalToken
+	telemetry := policy.TelemetryOptions{
+		ApplicationID: userAgent,
+	}
 
-	switch cfg.AuthenticationMethod {
-	case authMethodManagedIdentity:
-		spt, err = adal.NewServicePrincipalTokenFromManagedIdentity(resourceManagerEndpoint, &adal.ManagedIdentityOptions{ClientID: cfg.ClientID})
-		if err != nil {
-			return azureClient{}, err
-		}
-	case authMethodOAuth:
-		oauthConfig, err := adal.NewOAuthConfig(activeDirectoryEndpoint, cfg.TenantID)
-		if err != nil {
-			return azureClient{}, err
-		}
-
-		spt, err = adal.NewServicePrincipalToken(*oauthConfig, cfg.ClientID, string(cfg.ClientSecret), resourceManagerEndpoint)
-		if err != nil {
-			return azureClient{}, err
-		}
+	credential, err := newCredential(cfg, policy.ClientOptions{
+		Cloud:     cloudConfiguration,
+		Telemetry: telemetry,
+	})
+	if err != nil {
+		return azureClient{}, err
 	}
 
 	client, err := config_util.NewClientFromConfig(cfg.HTTPClientConfig, "azure_sd")
 	if err != nil {
 		return azureClient{}, err
 	}
-	sender := autorest.DecorateSender(client)
-	preparer := autorest.WithUserAgent(userAgent)
+	options := &arm.ClientOptions{
+		ClientOptions: policy.ClientOptions{
+			Transport: client,
+			Cloud:     cloudConfiguration,
+			Telemetry: telemetry,
+		},
+	}
 
-	bearerAuthorizer := autorest.NewBearerAuthorizer(spt)
+	c.vm, err = armcompute.NewVirtualMachinesClient(cfg.SubscriptionID, credential, options)
+	if err != nil {
+		return azureClient{}, err
+	}
 
-	c.vm = compute.NewVirtualMachinesClientWithBaseURI(resourceManagerEndpoint, cfg.SubscriptionID)
-	c.vm.Authorizer = bearerAuthorizer
-	c.vm.Sender = sender
-	c.vm.RequestInspector = preparer
+	c.nic, err = armnetwork.NewInterfacesClient(cfg.SubscriptionID, credential, options)
+	if err != nil {
+		return azureClient{}, err
+	}
 
-	c.nic = network.NewInterfacesClientWithBaseURI(resourceManagerEndpoint, cfg.SubscriptionID)
-	c.nic.Authorizer = bearerAuthorizer
-	c.nic.Sender = sender
-	c.nic.RequestInspector = preparer
+	c.vmss, err = armcompute.NewVirtualMachineScaleSetsClient(cfg.SubscriptionID, credential, options)
+	if err != nil {
+		return azureClient{}, err
+	}
 
-	c.vmss = compute.NewVirtualMachineScaleSetsClientWithBaseURI(resourceManagerEndpoint, cfg.SubscriptionID)
-	c.vmss.Authorizer = bearerAuthorizer
-	c.vmss.Sender = sender
-	c.vmss.RequestInspector = preparer
-
-	c.vmssvm = compute.NewVirtualMachineScaleSetVMsClientWithBaseURI(resourceManagerEndpoint, cfg.SubscriptionID)
-	c.vmssvm.Authorizer = bearerAuthorizer
-	c.vmssvm.Sender = sender
-	c.vmssvm.RequestInspector = preparer
+	c.vmssvm, err = armcompute.NewVirtualMachineScaleSetVMsClient(cfg.SubscriptionID, credential, options)
+	if err != nil {
+		return azureClient{}, err
+	}
 
 	return c, nil
 }
 
-// azureResource represents a resource identifier in Azure.
-type azureResource struct {
-	Name          string
-	ResourceGroup string
+func newCredential(cfg SDConfig, policyClientOptions policy.ClientOptions) (azcore.TokenCredential, error) {
+	var credential azcore.TokenCredential
+	switch cfg.AuthenticationMethod {
+	case authMethodManagedIdentity:
+		options := &azidentity.ManagedIdentityCredentialOptions{ClientOptions: policyClientOptions, ID: azidentity.ClientID(cfg.ClientID)}
+		managedIdentityCredential, err := azidentity.NewManagedIdentityCredential(options)
+		if err != nil {
+			return nil, err
+		}
+		credential = azcore.TokenCredential(managedIdentityCredential)
+	case authMethodOAuth:
+		options := &azidentity.ClientSecretCredentialOptions{ClientOptions: policyClientOptions}
+		secretCredential, err := azidentity.NewClientSecretCredential(cfg.TenantID, cfg.ClientID, string(cfg.ClientSecret), options)
+		if err != nil {
+			return nil, err
+		}
+		credential = azcore.TokenCredential(secretCredential)
+	}
+	return credential, nil
 }
 
-// virtualMachine represents an Azure virtual machine (which can also be created by a VMSS)
+// virtualMachine represents an Azure virtual machine (which can also be created by a VMSS).
 type virtualMachine struct {
 	ID                string
 	Name              string
@@ -260,28 +308,24 @@ type virtualMachine struct {
 	Location          string
 	OsType            string
 	ScaleSet          string
+	InstanceID        string
 	Tags              map[string]*string
 	NetworkInterfaces []string
 	Size              string
 }
 
 // Create a new azureResource object from an ID string.
-func newAzureResourceFromID(id string, logger log.Logger) (azureResource, error) {
-	// Resource IDs have the following format.
-	// /subscriptions/SUBSCRIPTION_ID/resourceGroups/RESOURCE_GROUP/providers/PROVIDER/TYPE/NAME
-	// or if embedded resource then
-	// /subscriptions/SUBSCRIPTION_ID/resourceGroups/RESOURCE_GROUP/providers/PROVIDER/TYPE/NAME/TYPE/NAME
-	s := strings.Split(id, "/")
-	if len(s) != 9 && len(s) != 11 {
-		err := fmt.Errorf("invalid ID '%s'. Refusing to create azureResource", id)
-		level.Error(logger).Log("err", err)
-		return azureResource{}, err
+func newAzureResourceFromID(id string, logger log.Logger) (*arm.ResourceID, error) {
+	if logger == nil {
+		logger = log.NewNopLogger()
 	}
-
-	return azureResource{
-		Name:          strings.ToLower(s[8]),
-		ResourceGroup: strings.ToLower(s[4]),
-	}, nil
+	resourceID, err := arm.ParseResourceID(id)
+	if err != nil {
+		err := fmt.Errorf("invalid ID '%s': %w", id, err)
+		level.Error(logger).Log("err", err)
+		return &arm.ResourceID{}, err
+	}
+	return resourceID, nil
 }
 
 func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
@@ -289,13 +333,14 @@ func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 
 	client, err := createAzureClient(*d.cfg)
 	if err != nil {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, fmt.Errorf("could not create Azure client: %w", err)
 	}
+	client.logger = d.logger
 
 	machines, err := client.getVMs(ctx, d.cfg.ResourceGroup)
 	if err != nil {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, fmt.Errorf("could not get virtual machines: %w", err)
 	}
 
@@ -304,14 +349,14 @@ func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 	// Load the vms managed by scale sets.
 	scaleSets, err := client.getScaleSets(ctx, d.cfg.ResourceGroup)
 	if err != nil {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, fmt.Errorf("could not get virtual machine scale sets: %w", err)
 	}
 
 	for _, scaleSet := range scaleSets {
 		scaleSetVms, err := client.getScaleSetVMs(ctx, scaleSet)
 		if err != nil {
-			failuresCount.Inc()
+			d.failuresCount.Inc()
 			return nil, fmt.Errorf("could not get virtual machine scale set vms: %w", err)
 		}
 		machines = append(machines, scaleSetVms...)
@@ -344,7 +389,7 @@ func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 				azureLabelMachineComputerName:  model.LabelValue(vm.ComputerName),
 				azureLabelMachineOSType:        model.LabelValue(vm.OsType),
 				azureLabelMachineLocation:      model.LabelValue(vm.Location),
-				azureLabelMachineResourceGroup: model.LabelValue(r.ResourceGroup),
+				azureLabelMachineResourceGroup: model.LabelValue(r.ResourceGroupName),
 				azureLabelMachineSize:          model.LabelValue(vm.Size),
 			}
 
@@ -359,18 +404,29 @@ func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 
 			// Get the IP address information via separate call to the network provider.
 			for _, nicID := range vm.NetworkInterfaces {
-				networkInterface, err := client.getNetworkInterfaceByID(ctx, nicID)
-				if err != nil {
-					if errors.Is(err, errorNotFound) {
-						level.Warn(d.logger).Log("msg", "Network interface does not exist", "name", nicID, "err", err)
+				var networkInterface *armnetwork.Interface
+				if v, ok := d.getFromCache(nicID); ok {
+					networkInterface = v
+					d.cacheHitCount.Add(1)
+				} else {
+					if vm.ScaleSet == "" {
+						networkInterface, err = client.getVMNetworkInterfaceByID(ctx, nicID)
 					} else {
-						ch <- target{labelSet: nil, err: err}
+						networkInterface, err = client.getVMScaleSetVMNetworkInterfaceByID(ctx, nicID, vm.ScaleSet, vm.InstanceID)
 					}
-					// Get out of this routine because we cannot continue without a network interface.
-					return
+					if err != nil {
+						if errors.Is(err, errorNotFound) {
+							level.Warn(d.logger).Log("msg", "Network interface does not exist", "name", nicID, "err", err)
+						} else {
+							ch <- target{labelSet: nil, err: err}
+						}
+						// Get out of this routine because we cannot continue without a network interface.
+						return
+					}
+					d.addToCache(nicID, networkInterface)
 				}
 
-				if networkInterface.InterfacePropertiesFormat == nil {
+				if networkInterface.Properties == nil {
 					continue
 				}
 
@@ -378,21 +434,21 @@ func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 				// This information is available via another API call however the Go SDK does not
 				// yet support this. On deallocated machines, this value happens to be nil so it
 				// is a cheap and easy way to determine if a machine is allocated or not.
-				if networkInterface.Primary == nil {
+				if networkInterface.Properties.Primary == nil {
 					level.Debug(d.logger).Log("msg", "Skipping deallocated virtual machine", "machine", vm.Name)
 					return
 				}
 
-				if *networkInterface.Primary {
-					for _, ip := range *networkInterface.IPConfigurations {
+				if *networkInterface.Properties.Primary {
+					for _, ip := range networkInterface.Properties.IPConfigurations {
 						// IPAddress is a field defined in PublicIPAddressPropertiesFormat,
 						// therefore we need to validate that both are not nil.
-						if ip.PublicIPAddress != nil && ip.PublicIPAddress.PublicIPAddressPropertiesFormat != nil && ip.PublicIPAddress.IPAddress != nil {
-							labels[azureLabelMachinePublicIP] = model.LabelValue(*ip.PublicIPAddress.IPAddress)
+						if ip.Properties != nil && ip.Properties.PublicIPAddress != nil && ip.Properties.PublicIPAddress.Properties != nil && ip.Properties.PublicIPAddress.Properties.IPAddress != nil {
+							labels[azureLabelMachinePublicIP] = model.LabelValue(*ip.Properties.PublicIPAddress.Properties.IPAddress)
 						}
-						if ip.PrivateIPAddress != nil {
-							labels[azureLabelMachinePrivateIP] = model.LabelValue(*ip.PrivateIPAddress)
-							address := net.JoinHostPort(*ip.PrivateIPAddress, fmt.Sprintf("%d", d.port))
+						if ip.Properties != nil && ip.Properties.PrivateIPAddress != nil {
+							labels[azureLabelMachinePrivateIP] = model.LabelValue(*ip.Properties.PrivateIPAddress)
+							address := net.JoinHostPort(*ip.Properties.PrivateIPAddress, fmt.Sprintf("%d", d.port))
 							labels[model.AddressLabel] = model.LabelValue(address)
 							ch <- target{labelSet: labels, err: nil}
 							return
@@ -414,7 +470,7 @@ func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 	var tg targetgroup.Group
 	for tgt := range ch {
 		if tgt.err != nil {
-			failuresCount.Inc()
+			d.failuresCount.Inc()
 			return nil, fmt.Errorf("unable to complete Azure service discovery: %w", tgt.err)
 		}
 		if tgt.labelSet != nil {
@@ -427,93 +483,84 @@ func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 
 func (client *azureClient) getVMs(ctx context.Context, resourceGroup string) ([]virtualMachine, error) {
 	var vms []virtualMachine
-	var result compute.VirtualMachineListResultPage
-	var err error
 	if len(resourceGroup) == 0 {
-		result, err = client.vm.ListAll(ctx)
+		pager := client.vm.NewListAllPager(nil)
+		for pager.More() {
+			nextResult, err := pager.NextPage(ctx)
+			if err != nil {
+				return nil, fmt.Errorf("could not list virtual machines: %w", err)
+			}
+			for _, vm := range nextResult.Value {
+				vms = append(vms, mapFromVM(*vm))
+			}
+		}
 	} else {
-		result, err = client.vm.List(ctx, resourceGroup)
-	}
-	if err != nil {
-		return nil, fmt.Errorf("could not list virtual machines: %w", err)
-	}
-	for result.NotDone() {
-		for _, vm := range result.Values() {
-			vms = append(vms, mapFromVM(vm))
-		}
-		err = result.NextWithContext(ctx)
-		if err != nil {
-			return nil, fmt.Errorf("could not list virtual machines: %w", err)
+		pager := client.vm.NewListPager(resourceGroup, nil)
+		for pager.More() {
+			nextResult, err := pager.NextPage(ctx)
+			if err != nil {
+				return nil, fmt.Errorf("could not list virtual machines: %w", err)
+			}
+			for _, vm := range nextResult.Value {
+				vms = append(vms, mapFromVM(*vm))
+			}
 		}
 	}
-
 	return vms, nil
 }
 
-type VmssListResultPage interface {
-	NextWithContext(ctx context.Context) (err error)
-	NotDone() bool
-	Values() []compute.VirtualMachineScaleSet
-}
-
-func (client *azureClient) getScaleSets(ctx context.Context, resourceGroup string) ([]compute.VirtualMachineScaleSet, error) {
-	var scaleSets []compute.VirtualMachineScaleSet
-	var result VmssListResultPage
-	var err error
+func (client *azureClient) getScaleSets(ctx context.Context, resourceGroup string) ([]armcompute.VirtualMachineScaleSet, error) {
+	var scaleSets []armcompute.VirtualMachineScaleSet
 	if len(resourceGroup) == 0 {
-		var rtn compute.VirtualMachineScaleSetListWithLinkResultPage
-		rtn, err = client.vmss.ListAll(ctx)
-		if err != nil {
-			return nil, fmt.Errorf("could not list virtual machine scale sets: %w", err)
+		pager := client.vmss.NewListAllPager(nil)
+		for pager.More() {
+			nextResult, err := pager.NextPage(ctx)
+			if err != nil {
+				return nil, fmt.Errorf("could not list virtual machine scale sets: %w", err)
+			}
+			for _, vmss := range nextResult.Value {
+				scaleSets = append(scaleSets, *vmss)
+			}
 		}
-		result = &rtn
 	} else {
-		var rtn compute.VirtualMachineScaleSetListResultPage
-		rtn, err = client.vmss.List(ctx, resourceGroup)
-		if err != nil {
-			return nil, fmt.Errorf("could not list virtual machine scale sets: %w", err)
-		}
-		result = &rtn
-	}
-
-	for result.NotDone() {
-		scaleSets = append(scaleSets, result.Values()...)
-		err = result.NextWithContext(ctx)
-		if err != nil {
-			return nil, fmt.Errorf("could not list virtual machine scale sets: %w", err)
+		pager := client.vmss.NewListPager(resourceGroup, nil)
+		for pager.More() {
+			nextResult, err := pager.NextPage(ctx)
+			if err != nil {
+				return nil, fmt.Errorf("could not list virtual machine scale sets: %w", err)
+			}
+			for _, vmss := range nextResult.Value {
+				scaleSets = append(scaleSets, *vmss)
+			}
 		}
 	}
-
 	return scaleSets, nil
 }
 
-func (client *azureClient) getScaleSetVMs(ctx context.Context, scaleSet compute.VirtualMachineScaleSet) ([]virtualMachine, error) {
+func (client *azureClient) getScaleSetVMs(ctx context.Context, scaleSet armcompute.VirtualMachineScaleSet) ([]virtualMachine, error) {
 	var vms []virtualMachine
 	// TODO do we really need to fetch the resourcegroup this way?
-	r, err := newAzureResourceFromID(*scaleSet.ID, nil)
+	r, err := newAzureResourceFromID(*scaleSet.ID, client.logger)
 	if err != nil {
 		return nil, fmt.Errorf("could not parse scale set ID: %w", err)
 	}
 
-	result, err := client.vmssvm.List(ctx, r.ResourceGroup, *(scaleSet.Name), "", "", "")
-	if err != nil {
-		return nil, fmt.Errorf("could not list virtual machine scale set vms: %w", err)
-	}
-	for result.NotDone() {
-		for _, vm := range result.Values() {
-			vms = append(vms, mapFromVMScaleSetVM(vm, *scaleSet.Name))
-		}
-		err = result.NextWithContext(ctx)
+	pager := client.vmssvm.NewListPager(r.ResourceGroupName, *(scaleSet.Name), nil)
+	for pager.More() {
+		nextResult, err := pager.NextPage(ctx)
 		if err != nil {
 			return nil, fmt.Errorf("could not list virtual machine scale set vms: %w", err)
 		}
+		for _, vmssvm := range nextResult.Value {
+			vms = append(vms, mapFromVMScaleSetVM(*vmssvm, *scaleSet.Name))
+		}
 	}
 
 	return vms, nil
 }
 
-func mapFromVM(vm compute.VirtualMachine) virtualMachine {
-	osType := string(vm.StorageProfile.OsDisk.OsType)
+func mapFromVM(vm armcompute.VirtualMachine) virtualMachine {
+	osType := string(*vm.Properties.StorageProfile.OSDisk.OSType)
 	tags := map[string]*string{}
 	networkInterfaces := []string{}
 	var computerName string
@@ -523,18 +570,17 @@ func mapFromVM(vm compute.VirtualMachine) virtualMachine {
 		tags = vm.Tags
 	}
 
-	if vm.NetworkProfile != nil {
-		for _, vmNIC := range *(vm.NetworkProfile.NetworkInterfaces) {
-			networkInterfaces = append(networkInterfaces, *vmNIC.ID)
+	if vm.Properties != nil {
+		if vm.Properties.NetworkProfile != nil {
+			for _, vmNIC := range vm.Properties.NetworkProfile.NetworkInterfaces {
+				networkInterfaces = append(networkInterfaces, *vmNIC.ID)
+			}
 		}
-	}
-
-	if vm.VirtualMachineProperties != nil {
-		if vm.VirtualMachineProperties.OsProfile != nil && vm.VirtualMachineProperties.OsProfile.ComputerName != nil {
-			computerName = *(vm.VirtualMachineProperties.OsProfile.ComputerName)
+		if vm.Properties.OSProfile != nil && vm.Properties.OSProfile.ComputerName != nil {
+			computerName = *(vm.Properties.OSProfile.ComputerName)
 		}
-		if vm.VirtualMachineProperties.HardwareProfile != nil {
-			size = string(vm.VirtualMachineProperties.HardwareProfile.VMSize)
+		if vm.Properties.HardwareProfile != nil {
+			size = string(*vm.Properties.HardwareProfile.VMSize)
 		}
 	}
 
@@ -552,8 +598,8 @@ func mapFromVM(vm compute.VirtualMachine) virtualMachine {
 	}
 }
 
-func mapFromVMScaleSetVM(vm compute.VirtualMachineScaleSetVM, scaleSetName string) virtualMachine {
-	osType := string(vm.StorageProfile.OsDisk.OsType)
+func mapFromVMScaleSetVM(vm armcompute.VirtualMachineScaleSetVM, scaleSetName string) virtualMachine {
+	osType := string(*vm.Properties.StorageProfile.OSDisk.OSType)
 	tags := map[string]*string{}
 	networkInterfaces := []string{}
 	var computerName string
@@ -563,18 +609,17 @@ func mapFromVMScaleSetVM(vm compute.VirtualMachineScaleSetVM, scaleSetName strin
 		tags = vm.Tags
 	}
 
-	if vm.NetworkProfile != nil {
-		for _, vmNIC := range *(vm.NetworkProfile.NetworkInterfaces) {
-			networkInterfaces = append(networkInterfaces, *vmNIC.ID)
+	if vm.Properties != nil {
+		if vm.Properties.NetworkProfile != nil {
+			for _, vmNIC := range vm.Properties.NetworkProfile.NetworkInterfaces {
+				networkInterfaces = append(networkInterfaces, *vmNIC.ID)
+			}
 		}
-	}
-
-	if vm.VirtualMachineScaleSetVMProperties != nil {
-		if vm.VirtualMachineScaleSetVMProperties.OsProfile != nil && vm.VirtualMachineScaleSetVMProperties.OsProfile.ComputerName != nil {
-			computerName = *(vm.VirtualMachineScaleSetVMProperties.OsProfile.ComputerName)
+		if vm.Properties.OSProfile != nil && vm.Properties.OSProfile.ComputerName != nil {
+			computerName = *(vm.Properties.OSProfile.ComputerName)
 		}
-		if vm.VirtualMachineScaleSetVMProperties.HardwareProfile != nil {
-			size = string(vm.VirtualMachineScaleSetVMProperties.HardwareProfile.VMSize)
+		if vm.Properties.HardwareProfile != nil {
+			size = string(*vm.Properties.HardwareProfile.VMSize)
 		}
 	}
 
@@ -586,6 +631,7 @@ func mapFromVMScaleSetVM(vm compute.VirtualMachineScaleSetVM, scaleSetName strin
 		Location:          *(vm.Location),
 		OsType:            osType,
 		ScaleSet:          scaleSetName,
+		InstanceID:        *(vm.InstanceID),
 		Tags:              tags,
 		NetworkInterfaces: networkInterfaces,
 		Size:              size,
@@ -594,38 +640,58 @@ func mapFromVMScaleSetVM(vm compute.VirtualMachineScaleSetVM, scaleSetName strin
 
 var errorNotFound = errors.New("network interface does not exist")
 
-// getNetworkInterfaceByID gets the network interface.
+// getVMNetworkInterfaceByID gets the network interface.
 // If a 404 is returned from the Azure API, `errorNotFound` is returned.
-// On all other errors, an autorest.DetailedError is returned.
-func (client *azureClient) getNetworkInterfaceByID(ctx context.Context, networkInterfaceID string) (*network.Interface, error) {
-	result := network.Interface{}
-	queryParameters := map[string]interface{}{
-		"api-version": "2018-10-01",
+func (client *azureClient) getVMNetworkInterfaceByID(ctx context.Context, networkInterfaceID string) (*armnetwork.Interface, error) {
+	r, err := newAzureResourceFromID(networkInterfaceID, client.logger)
+	if err != nil {
+		return nil, fmt.Errorf("could not parse network interface ID: %w", err)
 	}
 
-	preparer := autorest.CreatePreparer(
-		autorest.AsGet(),
-		autorest.WithBaseURL(client.nic.BaseURI),
-		autorest.WithPath(networkInterfaceID),
-		autorest.WithQueryParameters(queryParameters),
-		autorest.WithUserAgent(userAgent))
-	req, err := preparer.Prepare((&http.Request{}).WithContext(ctx))
+	resp, err := client.nic.Get(ctx, r.ResourceGroupName, r.Name, &armnetwork.InterfacesClientGetOptions{Expand: to.Ptr("IPConfigurations/PublicIPAddress")})
 	if err != nil {
-		return nil, autorest.NewErrorWithError(err, "network.InterfacesClient", "Get", nil, "Failure preparing request")
-	}
-
-	resp, err := client.nic.GetSender(req)
-	if err != nil {
-		return nil, autorest.NewErrorWithError(err, "network.InterfacesClient", "Get", resp, "Failure sending request")
-	}
-
-	result, err = client.nic.GetResponder(resp)
-	if err != nil {
-		if resp.StatusCode == http.StatusNotFound {
+		var responseError *azcore.ResponseError
+		if errors.As(err, &responseError) && responseError.StatusCode == http.StatusNotFound {
 			return nil, errorNotFound
 		}
-		return nil, autorest.NewErrorWithError(err, "network.InterfacesClient", "Get", resp, "Failure responding to request")
+		return nil, fmt.Errorf("failed to retrieve Interface %v with error: %w", networkInterfaceID, err)
 	}
 
-	return &result, nil
+	return &resp.Interface, nil
+}
+
+// getVMScaleSetVMNetworkInterfaceByID gets the network interface.
+// If a 404 is returned from the Azure API, `errorNotFound` is returned.
+func (client *azureClient) getVMScaleSetVMNetworkInterfaceByID(ctx context.Context, networkInterfaceID, scaleSetName, instanceID string) (*armnetwork.Interface, error) {
+	r, err := newAzureResourceFromID(networkInterfaceID, client.logger)
+	if err != nil {
+		return nil, fmt.Errorf("could not parse network interface ID: %w", err)
+	}
+
+	resp, err := client.nic.GetVirtualMachineScaleSetNetworkInterface(ctx, r.ResourceGroupName, scaleSetName, instanceID, r.Name, &armnetwork.InterfacesClientGetVirtualMachineScaleSetNetworkInterfaceOptions{Expand: to.Ptr("IPConfigurations/PublicIPAddress")})
+	if err != nil {
+		var responseError *azcore.ResponseError
+		if errors.As(err, &responseError) && responseError.StatusCode == http.StatusNotFound {
+			return nil, errorNotFound
+		}
+		return nil, fmt.Errorf("failed to retrieve Interface %v with error: %w", networkInterfaceID, err)
+	}
+
+	return &resp.Interface, nil
+}
+
+// addToCache will add the network interface information for the specified nicID.
+func (d *Discovery) addToCache(nicID string, netInt *armnetwork.Interface) {
+	random := rand.Int63n(int64(time.Duration(d.cfg.RefreshInterval * 3).Seconds()))
+	rs := time.Duration(random) * time.Second
+	exptime := time.Duration(d.cfg.RefreshInterval*10) + rs
+	d.cache.Set(nicID, netInt, cache.WithExpiration(exptime))
+	level.Debug(d.logger).Log("msg", "Adding nic", "nic", nicID, "time", exptime.Seconds())
+}
+
+// getFromCache will get the network Interface for the specified nicID
+// If the cache is disabled nothing will happen.
+func (d *Discovery) getFromCache(nicID string) (*armnetwork.Interface, bool) {
+	net, found := d.cache.Get(nicID)
+	return net, found
 }

discovery/azure/azure_test.go

@@ -16,7 +16,8 @@ package azure
 import (
 	"testing"
 
-	"github.com/Azure/azure-sdk-for-go/services/compute/mgmt/2018-10-01/compute"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/arm"
+	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v5"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/goleak"
 )
@@ -29,34 +30,36 @@ func TestMapFromVMWithEmptyTags(t *testing.T) {
 	id := "test"
 	name := "name"
 	size := "size"
+	vmSize := armcompute.VirtualMachineSizeTypes(size)
+	osType := armcompute.OperatingSystemTypesLinux
 	vmType := "type"
 	location := "westeurope"
 	computerName := "computer_name"
-	networkProfile := compute.NetworkProfile{
-		NetworkInterfaces: &[]compute.NetworkInterfaceReference{},
+	networkProfile := armcompute.NetworkProfile{
+		NetworkInterfaces: []*armcompute.NetworkInterfaceReference{},
 	}
-	properties := &compute.VirtualMachineProperties{
-		OsProfile: &compute.OSProfile{
+	properties := &armcompute.VirtualMachineProperties{
+		OSProfile: &armcompute.OSProfile{
 			ComputerName: &computerName,
 		},
-		StorageProfile: &compute.StorageProfile{
-			OsDisk: &compute.OSDisk{
-				OsType: "Linux",
+		StorageProfile: &armcompute.StorageProfile{
+			OSDisk: &armcompute.OSDisk{
+				OSType: &osType,
 			},
 		},
 		NetworkProfile: &networkProfile,
-		HardwareProfile: &compute.HardwareProfile{
-			VMSize: compute.VirtualMachineSizeTypes(size),
+		HardwareProfile: &armcompute.HardwareProfile{
+			VMSize: &vmSize,
 		},
 	}
 
-	testVM := compute.VirtualMachine{
-		ID:                       &id,
-		Name:                     &name,
-		Type:                     &vmType,
-		Location:                 &location,
-		Tags:                     nil,
-		VirtualMachineProperties: properties,
+	testVM := armcompute.VirtualMachine{
+		ID:         &id,
+		Name:       &name,
+		Type:       &vmType,
+		Location:   &location,
+		Tags:       nil,
+		Properties: properties,
 	}
 
 	expectedVM := virtualMachine{
@@ -80,37 +83,39 @@ func TestMapFromVMWithTags(t *testing.T) {
 	id := "test"
 	name := "name"
 	size := "size"
+	vmSize := armcompute.VirtualMachineSizeTypes(size)
+	osType := armcompute.OperatingSystemTypesLinux
 	vmType := "type"
 	location := "westeurope"
 	computerName := "computer_name"
 	tags := map[string]*string{
 		"prometheus": new(string),
 	}
-	networkProfile := compute.NetworkProfile{
-		NetworkInterfaces: &[]compute.NetworkInterfaceReference{},
+	networkProfile := armcompute.NetworkProfile{
+		NetworkInterfaces: []*armcompute.NetworkInterfaceReference{},
 	}
-	properties := &compute.VirtualMachineProperties{
-		OsProfile: &compute.OSProfile{
+	properties := &armcompute.VirtualMachineProperties{
+		OSProfile: &armcompute.OSProfile{
 			ComputerName: &computerName,
 		},
-		StorageProfile: &compute.StorageProfile{
-			OsDisk: &compute.OSDisk{
-				OsType: "Linux",
+		StorageProfile: &armcompute.StorageProfile{
+			OSDisk: &armcompute.OSDisk{
+				OSType: &osType,
 			},
 		},
 		NetworkProfile: &networkProfile,
-		HardwareProfile: &compute.HardwareProfile{
-			VMSize: compute.VirtualMachineSizeTypes(size),
+		HardwareProfile: &armcompute.HardwareProfile{
+			VMSize: &vmSize,
 		},
 	}
 
-	testVM := compute.VirtualMachine{
-		ID:                       &id,
-		Name:                     &name,
-		Type:                     &vmType,
-		Location:                 &location,
-		Tags:                     tags,
-		VirtualMachineProperties: properties,
+	testVM := armcompute.VirtualMachine{
+		ID:         &id,
+		Name:       &name,
+		Type:       &vmType,
+		Location:   &location,
+		Tags:       tags,
+		Properties: properties,
 	}
 
 	expectedVM := virtualMachine{
@@ -134,34 +139,38 @@ func TestMapFromVMScaleSetVMWithEmptyTags(t *testing.T) {
 	id := "test"
 	name := "name"
 	size := "size"
+	vmSize := armcompute.VirtualMachineSizeTypes(size)
+	osType := armcompute.OperatingSystemTypesLinux
 	vmType := "type"
+	instanceID := "123"
 	location := "westeurope"
 	computerName := "computer_name"
-	networkProfile := compute.NetworkProfile{
-		NetworkInterfaces: &[]compute.NetworkInterfaceReference{},
+	networkProfile := armcompute.NetworkProfile{
+		NetworkInterfaces: []*armcompute.NetworkInterfaceReference{},
 	}
-	properties := &compute.VirtualMachineScaleSetVMProperties{
-		OsProfile: &compute.OSProfile{
+	properties := &armcompute.VirtualMachineScaleSetVMProperties{
+		OSProfile: &armcompute.OSProfile{
 			ComputerName: &computerName,
 		},
-		StorageProfile: &compute.StorageProfile{
-			OsDisk: &compute.OSDisk{
-				OsType: "Linux",
+		StorageProfile: &armcompute.StorageProfile{
+			OSDisk: &armcompute.OSDisk{
+				OSType: &osType,
 			},
 		},
 		NetworkProfile: &networkProfile,
-		HardwareProfile: &compute.HardwareProfile{
-			VMSize: compute.VirtualMachineSizeTypes(size),
+		HardwareProfile: &armcompute.HardwareProfile{
+			VMSize: &vmSize,
 		},
 	}
 
-	testVM := compute.VirtualMachineScaleSetVM{
-		ID:                                 &id,
-		Name:                               &name,
-		Type:                               &vmType,
-		Location:                           &location,
-		Tags:                               nil,
-		VirtualMachineScaleSetVMProperties: properties,
+	testVM := armcompute.VirtualMachineScaleSetVM{
+		ID:         &id,
+		Name:       &name,
+		Type:       &vmType,
+		InstanceID: &instanceID,
+		Location:   &location,
+		Tags:       nil,
+		Properties: properties,
 	}
 
 	scaleSet := "testSet"
@@ -175,6 +184,7 @@ func TestMapFromVMScaleSetVMWithEmptyTags(t *testing.T) {
 		Tags:              map[string]*string{},
 		NetworkInterfaces: []string{},
 		ScaleSet:          scaleSet,
+		InstanceID:        instanceID,
 		Size:              size,
 	}
 
@@ -187,37 +197,41 @@ func TestMapFromVMScaleSetVMWithTags(t *testing.T) {
 	id := "test"
 	name := "name"
 	size := "size"
+	vmSize := armcompute.VirtualMachineSizeTypes(size)
+	osType := armcompute.OperatingSystemTypesLinux
 	vmType := "type"
+	instanceID := "123"
 	location := "westeurope"
 	computerName := "computer_name"
 	tags := map[string]*string{
 		"prometheus": new(string),
 	}
-	networkProfile := compute.NetworkProfile{
-		NetworkInterfaces: &[]compute.NetworkInterfaceReference{},
+	networkProfile := armcompute.NetworkProfile{
+		NetworkInterfaces: []*armcompute.NetworkInterfaceReference{},
 	}
-	properties := &compute.VirtualMachineScaleSetVMProperties{
-		OsProfile: &compute.OSProfile{
+	properties := &armcompute.VirtualMachineScaleSetVMProperties{
+		OSProfile: &armcompute.OSProfile{
 			ComputerName: &computerName,
 		},
-		StorageProfile: &compute.StorageProfile{
-			OsDisk: &compute.OSDisk{
-				OsType: "Linux",
+		StorageProfile: &armcompute.StorageProfile{
+			OSDisk: &armcompute.OSDisk{
+				OSType: &osType,
 			},
 		},
 		NetworkProfile: &networkProfile,
-		HardwareProfile: &compute.HardwareProfile{
-			VMSize: compute.VirtualMachineSizeTypes(size),
+		HardwareProfile: &armcompute.HardwareProfile{
+			VMSize: &vmSize,
 		},
 	}
 
-	testVM := compute.VirtualMachineScaleSetVM{
-		ID:                                 &id,
-		Name:                               &name,
-		Type:                               &vmType,
-		Location:                           &location,
-		Tags:                               tags,
-		VirtualMachineScaleSetVMProperties: properties,
+	testVM := armcompute.VirtualMachineScaleSetVM{
+		ID:         &id,
+		Name:       &name,
+		Type:       &vmType,
+		InstanceID: &instanceID,
+		Location:   &location,
+		Tags:       tags,
+		Properties: properties,
 	}
 
 	scaleSet := "testSet"
@@ -231,6 +245,7 @@ func TestMapFromVMScaleSetVMWithTags(t *testing.T) {
 		Tags:              tags,
 		NetworkInterfaces: []string{},
 		ScaleSet:          scaleSet,
+		InstanceID:        instanceID,
 		Size:              size,
 	}
 
@@ -242,18 +257,26 @@ func TestMapFromVMScaleSetVMWithTags(t *testing.T) {
 func TestNewAzureResourceFromID(t *testing.T) {
 	for _, tc := range []struct {
 		id       string
-		expected azureResource
+		expected *arm.ResourceID
 	}{
 		{
-			id:       "/a/b/c/group/d/e/f/name",
-			expected: azureResource{"name", "group"},
+			id: "/subscriptions/SUBSCRIPTION_ID/resourceGroups/group/providers/PROVIDER/TYPE/name",
+			expected: &arm.ResourceID{
+				Name:              "name",
+				ResourceGroupName: "group",
+			},
 		},
 		{
-			id:       "/a/b/c/group/d/e/f/name/g/h",
-			expected: azureResource{"name", "group"},
+			id: "/subscriptions/SUBSCRIPTION_ID/resourceGroups/group/providers/PROVIDER/TYPE/name/TYPE/h",
+			expected: &arm.ResourceID{
+				Name:              "h",
+				ResourceGroupName: "group",
+			},
 		},
 	} {
-		actual, _ := newAzureResourceFromID(tc.id, nil)
-		require.Equal(t, tc.expected, actual)
+		actual, err := newAzureResourceFromID(tc.id, nil)
+		require.NoError(t, err)
+		require.Equal(t, tc.expected.Name, actual.Name)
+		require.Equal(t, tc.expected.ResourceGroupName, actual.ResourceGroupName)
 	}
 }

discovery/consul/consul.go

@@ -50,7 +50,7 @@ const (
 	tagsLabel = model.MetaLabelPrefix + "consul_tags"
 	// serviceLabel is the name of the label containing the service name.
 	serviceLabel = model.MetaLabelPrefix + "consul_service"
-	// healthLabel is the name of the label containing the health of the service instance
+	// healthLabel is the name of the label containing the health of the service instance.
 	healthLabel = model.MetaLabelPrefix + "consul_health"
 	// serviceAddressLabel is the name of the label containing the (optional) service address.
 	serviceAddressLabel = model.MetaLabelPrefix + "consul_service_address"
@@ -71,46 +71,24 @@ const (
 	namespace = "prometheus"
 )
 
-var (
-	rpcFailuresCount = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Namespace: namespace,
-			Name:      "sd_consul_rpc_failures_total",
-			Help:      "The number of Consul RPC call failures.",
-		})
-	rpcDuration = prometheus.NewSummaryVec(
-		prometheus.SummaryOpts{
-			Namespace:  namespace,
-			Name:       "sd_consul_rpc_duration_seconds",
-			Help:       "The duration of a Consul RPC call in seconds.",
-			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-		},
-		[]string{"endpoint", "call"},
-	)
-
-	// Initialize metric vectors.
-	servicesRPCDuration = rpcDuration.WithLabelValues("catalog", "services")
-	serviceRPCDuration  = rpcDuration.WithLabelValues("catalog", "service")
-
-	// DefaultSDConfig is the default Consul SD configuration.
-	DefaultSDConfig = SDConfig{
-		TagSeparator:     ",",
-		Scheme:           "http",
-		Server:           "localhost:8500",
-		AllowStale:       true,
-		RefreshInterval:  model.Duration(30 * time.Second),
-		HTTPClientConfig: config.DefaultHTTPClientConfig,
-	}
-)
+// DefaultSDConfig is the default Consul SD configuration.
+var DefaultSDConfig = SDConfig{
+	TagSeparator:     ",",
+	Scheme:           "http",
+	Server:           "localhost:8500",
+	AllowStale:       true,
+	RefreshInterval:  model.Duration(30 * time.Second),
+	HTTPClientConfig: config.DefaultHTTPClientConfig,
+}
 
 func init() {
 	discovery.RegisterConfig(&SDConfig{})
-	prometheus.MustRegister(rpcFailuresCount, rpcDuration)
 }
 
 // SDConfig is the configuration for Consul service discovery.
 type SDConfig struct {
 	Server       string        `yaml:"server,omitempty"`
+	PathPrefix   string        `yaml:"path_prefix,omitempty"`
 	Token        config.Secret `yaml:"token,omitempty"`
 	Datacenter   string        `yaml:"datacenter,omitempty"`
 	Namespace    string        `yaml:"namespace,omitempty"`
@@ -146,7 +124,7 @@ func (*SDConfig) Name() string { return "consul" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(c, opts.Logger)
+	return NewDiscovery(c, opts.Logger, opts.Registerer)
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -183,22 +161,27 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 // Discovery retrieves target information from a Consul server
 // and updates them via watches.
 type Discovery struct {
-	client           *consul.Client
-	clientDatacenter string
-	clientNamespace  string
-	clientPartition  string
-	tagSeparator     string
-	watchedServices  []string // Set of services which will be discovered.
-	watchedTags      []string // Tags used to filter instances of a service.
-	watchedNodeMeta  map[string]string
-	allowStale       bool
-	refreshInterval  time.Duration
-	finalizer        func()
-	logger           log.Logger
+	client              *consul.Client
+	clientDatacenter    string
+	clientNamespace     string
+	clientPartition     string
+	tagSeparator        string
+	watchedServices     []string // Set of services which will be discovered.
+	watchedTags         []string // Tags used to filter instances of a service.
+	watchedNodeMeta     map[string]string
+	allowStale          bool
+	refreshInterval     time.Duration
+	finalizer           func()
+	logger              log.Logger
+	rpcFailuresCount    prometheus.Counter
+	rpcDuration         *prometheus.SummaryVec
+	servicesRPCDuration prometheus.Observer
+	serviceRPCDuration  prometheus.Observer
+	metricRegisterer    discovery.MetricRegisterer
 }
 
 // NewDiscovery returns a new Discovery for the given config.
-func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
+func NewDiscovery(conf *SDConfig, logger log.Logger, reg prometheus.Registerer) (*Discovery, error) {
 	if logger == nil {
 		logger = log.NewNopLogger()
 	}
@@ -211,6 +194,7 @@ func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
 
 	clientConf := &consul.Config{
 		Address:    conf.Server,
+		PathPrefix: conf.PathPrefix,
 		Scheme:     conf.Scheme,
 		Datacenter: conf.Datacenter,
 		Namespace:  conf.Namespace,
@@ -235,7 +219,35 @@ func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
 		clientPartition:  conf.Partition,
 		finalizer:        wrapper.CloseIdleConnections,
 		logger:           logger,
+		rpcFailuresCount: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Namespace: namespace,
+				Name:      "sd_consul_rpc_failures_total",
+				Help:      "The number of Consul RPC call failures.",
+			}),
+		rpcDuration: prometheus.NewSummaryVec(
+			prometheus.SummaryOpts{
+				Namespace:  namespace,
+				Name:       "sd_consul_rpc_duration_seconds",
+				Help:       "The duration of a Consul RPC call in seconds.",
+				Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
+			},
+			[]string{"endpoint", "call"},
+		),
 	}
+
+	cd.metricRegisterer = discovery.NewMetricRegisterer(
+		reg,
+		[]prometheus.Collector{
+			cd.rpcFailuresCount,
+			cd.rpcDuration,
+		},
+	)
+
+	// Initialize metric vectors.
+	cd.servicesRPCDuration = cd.rpcDuration.WithLabelValues("catalog", "services")
+	cd.serviceRPCDuration = cd.rpcDuration.WithLabelValues("catalog", "service")
+
 	return cd, nil
 }
 
@@ -291,7 +303,7 @@ func (d *Discovery) getDatacenter() error {
 	info, err := d.client.Agent().Self()
 	if err != nil {
 		level.Error(d.logger).Log("msg", "Error retrieving datacenter name", "err", err)
-		rpcFailuresCount.Inc()
+		d.rpcFailuresCount.Inc()
 		return err
 	}
 
@@ -332,6 +344,13 @@ func (d *Discovery) initialize(ctx context.Context) {
 
 // Run implements the Discoverer interface.
 func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
+	err := d.metricRegisterer.RegisterMetrics()
+	if err != nil {
+		level.Error(d.logger).Log("msg", "Unable to register metrics", "err", err.Error())
+		return
+	}
+	defer d.metricRegisterer.UnregisterMetrics()
+
 	if d.finalizer != nil {
 		defer d.finalizer()
 	}
@@ -380,7 +399,7 @@ func (d *Discovery) watchServices(ctx context.Context, ch chan<- []*targetgroup.
 	t0 := time.Now()
 	srvs, meta, err := catalog.Services(opts.WithContext(ctx))
 	elapsed := time.Since(t0)
-	servicesRPCDuration.Observe(elapsed.Seconds())
+	d.servicesRPCDuration.Observe(elapsed.Seconds())
 
 	// Check the context before in order to exit early.
 	select {
@@ -391,7 +410,7 @@ func (d *Discovery) watchServices(ctx context.Context, ch chan<- []*targetgroup.
 
 	if err != nil {
 		level.Error(d.logger).Log("msg", "Error refreshing service list", "err", err)
-		rpcFailuresCount.Inc()
+		d.rpcFailuresCount.Inc()
 		time.Sleep(retryInterval)
 		return
 	}
@@ -447,13 +466,15 @@ func (d *Discovery) watchServices(ctx context.Context, ch chan<- []*targetgroup.
 
 // consulService contains data belonging to the same service.
 type consulService struct {
-	name         string
-	tags         []string
-	labels       model.LabelSet
-	discovery    *Discovery
-	client       *consul.Client
-	tagSeparator string
-	logger       log.Logger
+	name               string
+	tags               []string
+	labels             model.LabelSet
+	discovery          *Discovery
+	client             *consul.Client
+	tagSeparator       string
+	logger             log.Logger
+	rpcFailuresCount   prometheus.Counter
+	serviceRPCDuration prometheus.Observer
 }
 
 // Start watching a service.
@@ -467,8 +488,10 @@ func (d *Discovery) watchService(ctx context.Context, ch chan<- []*targetgroup.G
 			serviceLabel:    model.LabelValue(name),
 			datacenterLabel: model.LabelValue(d.clientDatacenter),
 		},
-		tagSeparator: d.tagSeparator,
-		logger:       d.logger,
+		tagSeparator:       d.tagSeparator,
+		logger:             d.logger,
+		rpcFailuresCount:   d.rpcFailuresCount,
+		serviceRPCDuration: d.serviceRPCDuration,
 	}
 
 	go func() {
@@ -506,7 +529,7 @@ func (srv *consulService) watch(ctx context.Context, ch chan<- []*targetgroup.Gr
 	t0 := time.Now()
 	serviceNodes, meta, err := health.ServiceMultipleTags(srv.name, srv.tags, false, opts.WithContext(ctx))
 	elapsed := time.Since(t0)
-	serviceRPCDuration.Observe(elapsed.Seconds())
+	srv.serviceRPCDuration.Observe(elapsed.Seconds())
 
 	// Check the context before in order to exit early.
 	select {
@@ -518,7 +541,7 @@ func (srv *consulService) watch(ctx context.Context, ch chan<- []*targetgroup.Gr
 
 	if err != nil {
 		level.Error(srv.logger).Log("msg", "Error refreshing service", "service", srv.name, "tags", strings.Join(srv.tags, ","), "err", err)
-		rpcFailuresCount.Inc()
+		srv.rpcFailuresCount.Inc()
 		time.Sleep(retryInterval)
 		return
 	}

discovery/consul/consul_test.go

@@ -22,6 +22,7 @@ import (
 	"time"
 
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
@@ -39,7 +40,7 @@ func TestConfiguredService(t *testing.T) {
 	conf := &SDConfig{
 		Services: []string{"configuredServiceName"},
 	}
-	consulDiscovery, err := NewDiscovery(conf, nil)
+	consulDiscovery, err := NewDiscovery(conf, nil, prometheus.NewRegistry())
 	if err != nil {
 		t.Errorf("Unexpected error when initializing discovery %v", err)
 	}
@@ -56,7 +57,7 @@ func TestConfiguredServiceWithTag(t *testing.T) {
 		Services:    []string{"configuredServiceName"},
 		ServiceTags: []string{"http"},
 	}
-	consulDiscovery, err := NewDiscovery(conf, nil)
+	consulDiscovery, err := NewDiscovery(conf, nil, prometheus.NewRegistry())
 	if err != nil {
 		t.Errorf("Unexpected error when initializing discovery %v", err)
 	}
@@ -151,7 +152,7 @@ func TestConfiguredServiceWithTags(t *testing.T) {
 	}
 
 	for _, tc := range cases {
-		consulDiscovery, err := NewDiscovery(tc.conf, nil)
+		consulDiscovery, err := NewDiscovery(tc.conf, nil, prometheus.NewRegistry())
 		if err != nil {
 			t.Errorf("Unexpected error when initializing discovery %v", err)
 		}
@@ -165,7 +166,7 @@ func TestConfiguredServiceWithTags(t *testing.T) {
 
 func TestNonConfiguredService(t *testing.T) {
 	conf := &SDConfig{}
-	consulDiscovery, err := NewDiscovery(conf, nil)
+	consulDiscovery, err := NewDiscovery(conf, nil, prometheus.NewRegistry())
 	if err != nil {
 		t.Errorf("Unexpected error when initializing discovery %v", err)
 	}
@@ -262,19 +263,19 @@ func newServer(t *testing.T) (*httptest.Server, *SDConfig) {
 
 func newDiscovery(t *testing.T, config *SDConfig) *Discovery {
 	logger := log.NewNopLogger()
-	d, err := NewDiscovery(config, logger)
+	d, err := NewDiscovery(config, logger, prometheus.NewRegistry())
 	require.NoError(t, err)
 	return d
 }
 
 func checkOneTarget(t *testing.T, tg []*targetgroup.Group) {
-	require.Equal(t, 1, len(tg))
+	require.Len(t, tg, 1)
 	target := tg[0]
 	require.Equal(t, "test-dc", string(target.Labels["__meta_consul_dc"]))
 	require.Equal(t, target.Source, string(target.Labels["__meta_consul_service"]))
 	if target.Source == "test" {
 		// test service should have one node.
-		require.Greater(t, len(target.Targets), 0, "Test service should have one node")
+		require.NotEmpty(t, target.Targets, "Test service should have one node")
 	}
 }
 
@@ -313,7 +314,7 @@ func TestNoTargets(t *testing.T) {
 	}()
 
 	targets := (<-ch)[0].Targets
-	require.Equal(t, 0, len(targets))
+	require.Empty(t, targets)
 	cancel()
 	<-ch
 }
@@ -484,7 +485,7 @@ oauth2:
 				return
 			}
 
-			require.Equal(t, config, test.expected)
+			require.Equal(t, test.expected, config)
 		})
 	}
 }

discovery/digitalocean/digitalocean.go

@@ -24,6 +24,7 @@ import (
 
 	"github.com/digitalocean/godo"
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/common/version"
@@ -75,7 +76,7 @@ func (*SDConfig) Name() string { return "digitalocean" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(c, opts.Logger)
+	return NewDiscovery(c, opts.Logger, opts.Registerer)
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -103,7 +104,7 @@ type Discovery struct {
 }
 
 // NewDiscovery returns a new Discovery which periodically refreshes its targets.
-func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
+func NewDiscovery(conf *SDConfig, logger log.Logger, reg prometheus.Registerer) (*Discovery, error) {
 	d := &Discovery{
 		port: conf.Port,
 	}
@@ -125,10 +126,13 @@ func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
 	}
 
 	d.Discovery = refresh.NewDiscovery(
-		logger,
-		"digitalocean",
-		time.Duration(conf.RefreshInterval),
-		d.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "digitalocean",
+			Interval: time.Duration(conf.RefreshInterval),
+			RefreshF: d.refresh,
+			Registry: reg,
+		},
 	)
 	return d, nil
 }

discovery/digitalocean/digitalocean_test.go

@@ -20,6 +20,7 @@ import (
 	"testing"
 
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
 )
@@ -46,7 +47,7 @@ func TestDigitalOceanSDRefresh(t *testing.T) {
 
 	cfg := DefaultSDConfig
 	cfg.HTTPClientConfig.BearerToken = tokenID
-	d, err := NewDiscovery(&cfg, log.NewNopLogger())
+	d, err := NewDiscovery(&cfg, log.NewNopLogger(), prometheus.NewRegistry())
 	require.NoError(t, err)
 	endpoint, err := url.Parse(sdmock.Mock.Endpoint())
 	require.NoError(t, err)
@@ -56,12 +57,12 @@ func TestDigitalOceanSDRefresh(t *testing.T) {
 	tgs, err := d.refresh(ctx)
 	require.NoError(t, err)
 
-	require.Equal(t, 1, len(tgs))
+	require.Len(t, tgs, 1)
 
 	tg := tgs[0]
 	require.NotNil(t, tg)
 	require.NotNil(t, tg.Targets)
-	require.Equal(t, 4, len(tg.Targets))
+	require.Len(t, tg.Targets, 4)
 
 	for i, lbls := range []model.LabelSet{
 		{

discovery/digitalocean/mock_test.go

@@ -21,7 +21,7 @@ import (
 	"testing"
 )
 
-// SDMock is the interface for the DigitalOcean mock
+// SDMock is the interface for the DigitalOcean mock.
 type SDMock struct {
 	t      *testing.T
 	Server *httptest.Server
@@ -35,18 +35,18 @@ func NewSDMock(t *testing.T) *SDMock {
 	}
 }
 
-// Endpoint returns the URI to the mock server
+// Endpoint returns the URI to the mock server.
 func (m *SDMock) Endpoint() string {
 	return m.Server.URL + "/"
 }
 
-// Setup creates the mock server
+// Setup creates the mock server.
 func (m *SDMock) Setup() {
 	m.Mux = http.NewServeMux()
 	m.Server = httptest.NewServer(m.Mux)
 }
 
-// ShutdownServer creates the mock server
+// ShutdownServer creates the mock server.
 func (m *SDMock) ShutdownServer() {
 	m.Server.Close()
 }

discovery/discovery.go

@@ -18,6 +18,7 @@ import (
 	"reflect"
 
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/config"
 
 	"github.com/prometheus/prometheus/discovery/targetgroup"
@@ -42,6 +43,15 @@ type Discoverer interface {
 type DiscovererOptions struct {
 	Logger log.Logger
 
+	// A registerer for the Discoverer's metrics.
+	// Some Discoverers may ignore this registerer and use the global one instead.
+	// For now this will work, because the Prometheus `main` function uses the global registry.
+	// However, in the future the Prometheus `main` function will be updated to not use the global registry.
+	// Hence, if a discoverer wants its metrics to be visible via the Prometheus executable's
+	// `/metrics` endpoint, it should use this explicit registerer.
+	// TODO(ptodev): Update this comment once the Prometheus `main` function does not use the global registry.
+	Registerer prometheus.Registerer
+
 	// Extra HTTP client options to expose to Discoverers. This field may be
 	// ignored; Discoverer implementations must opt-in to reading it.
 	HTTPClientOptions []config.HTTPClientOption

discovery/dns/dns.go

@@ -42,35 +42,21 @@ const (
 	dnsSrvRecordPortLabel   = dnsSrvRecordPrefix + "port"
 	dnsMxRecordPrefix       = model.MetaLabelPrefix + "dns_mx_record_"
 	dnsMxRecordTargetLabel  = dnsMxRecordPrefix + "target"
+	dnsNsRecordPrefix       = model.MetaLabelPrefix + "dns_ns_record_"
+	dnsNsRecordTargetLabel  = dnsNsRecordPrefix + "target"
 
 	// Constants for instrumentation.
 	namespace = "prometheus"
 )
 
-var (
-	dnsSDLookupsCount = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Namespace: namespace,
-			Name:      "sd_dns_lookups_total",
-			Help:      "The number of DNS-SD lookups.",
-		})
-	dnsSDLookupFailuresCount = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Namespace: namespace,
-			Name:      "sd_dns_lookup_failures_total",
-			Help:      "The number of DNS-SD lookup failures.",
-		})
-
-	// DefaultSDConfig is the default DNS SD configuration.
-	DefaultSDConfig = SDConfig{
-		RefreshInterval: model.Duration(30 * time.Second),
-		Type:            "SRV",
-	}
-)
+// DefaultSDConfig is the default DNS SD configuration.
+var DefaultSDConfig = SDConfig{
+	RefreshInterval: model.Duration(30 * time.Second),
+	Type:            "SRV",
+}
 
 func init() {
 	discovery.RegisterConfig(&SDConfig{})
-	prometheus.MustRegister(dnsSDLookupFailuresCount, dnsSDLookupsCount)
 }
 
 // SDConfig is the configuration for DNS based service discovery.
@@ -86,7 +72,7 @@ func (*SDConfig) Name() string { return "dns" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(*c, opts.Logger), nil
+	return NewDiscovery(*c, opts.Logger, opts.Registerer)
 }
 
 // UnmarshalYAML implements the yaml.Unmarshaler interface.
@@ -102,7 +88,7 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	}
 	switch strings.ToUpper(c.Type) {
 	case "SRV":
-	case "A", "AAAA", "MX":
+	case "A", "AAAA", "MX", "NS":
 		if c.Port == 0 {
 			return errors.New("a port is required in DNS-SD configs for all record types except SRV")
 		}
@@ -116,16 +102,18 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 // the Discoverer interface.
 type Discovery struct {
 	*refresh.Discovery
-	names  []string
-	port   int
-	qtype  uint16
-	logger log.Logger
+	names                    []string
+	port                     int
+	qtype                    uint16
+	logger                   log.Logger
+	dnsSDLookupsCount        prometheus.Counter
+	dnsSDLookupFailuresCount prometheus.Counter
 
 	lookupFn func(name string, qtype uint16, logger log.Logger) (*dns.Msg, error)
 }
 
 // NewDiscovery returns a new Discovery which periodically refreshes its targets.
-func NewDiscovery(conf SDConfig, logger log.Logger) *Discovery {
+func NewDiscovery(conf SDConfig, logger log.Logger, reg prometheus.Registerer) (*Discovery, error) {
 	if logger == nil {
 		logger = log.NewNopLogger()
 	}
@@ -140,6 +128,8 @@ func NewDiscovery(conf SDConfig, logger log.Logger) *Discovery {
 		qtype = dns.TypeSRV
 	case "MX":
 		qtype = dns.TypeMX
+	case "NS":
+		qtype = dns.TypeNS
 	}
 	d := &Discovery{
 		names:    conf.Names,
@@ -147,14 +137,32 @@ func NewDiscovery(conf SDConfig, logger log.Logger) *Discovery {
 		port:     conf.Port,
 		logger:   logger,
 		lookupFn: lookupWithSearchPath,
+		dnsSDLookupsCount: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Namespace: namespace,
+				Name:      "sd_dns_lookups_total",
+				Help:      "The number of DNS-SD lookups.",
+			}),
+		dnsSDLookupFailuresCount: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Namespace: namespace,
+				Name:      "sd_dns_lookup_failures_total",
+				Help:      "The number of DNS-SD lookup failures.",
+			}),
 	}
+
 	d.Discovery = refresh.NewDiscovery(
-		logger,
-		"dns",
-		time.Duration(conf.RefreshInterval),
-		d.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "dns",
+			Interval: time.Duration(conf.RefreshInterval),
+			RefreshF: d.refresh,
+			Registry: prometheus.NewRegistry(),
+			Metrics:  []prometheus.Collector{d.dnsSDLookupsCount, d.dnsSDLookupFailuresCount},
+		},
 	)
-	return d
+
+	return d, nil
 }
 
 func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
@@ -187,9 +195,9 @@ func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 
 func (d *Discovery) refreshOne(ctx context.Context, name string, ch chan<- *targetgroup.Group) error {
 	response, err := d.lookupFn(name, d.qtype, d.logger)
-	dnsSDLookupsCount.Inc()
+	d.dnsSDLookupsCount.Inc()
 	if err != nil {
-		dnsSDLookupFailuresCount.Inc()
+		d.dnsSDLookupFailuresCount.Inc()
 		return err
 	}
 
@@ -199,7 +207,7 @@ func (d *Discovery) refreshOne(ctx context.Context, name string, ch chan<- *targ
 	}
 
 	for _, record := range response.Answer {
-		var target, dnsSrvRecordTarget, dnsSrvRecordPort, dnsMxRecordTarget model.LabelValue
+		var target, dnsSrvRecordTarget, dnsSrvRecordPort, dnsMxRecordTarget, dnsNsRecordTarget model.LabelValue
 
 		switch addr := record.(type) {
 		case *dns.SRV:
@@ -217,6 +225,13 @@ func (d *Discovery) refreshOne(ctx context.Context, name string, ch chan<- *targ
 			addr.Mx = strings.TrimRight(addr.Mx, ".")
 
 			target = hostPort(addr.Mx, d.port)
+		case *dns.NS:
+			dnsNsRecordTarget = model.LabelValue(addr.Ns)
+
+			// Remove the final dot from rooted DNS names to make them look more usual.
+			addr.Ns = strings.TrimRight(addr.Ns, ".")
+
+			target = hostPort(addr.Ns, d.port)
 		case *dns.A:
 			target = hostPort(addr.A.String(), d.port)
 		case *dns.AAAA:
@@ -234,6 +249,7 @@ func (d *Discovery) refreshOne(ctx context.Context, name string, ch chan<- *targ
 			dnsSrvRecordTargetLabel: dnsSrvRecordTarget,
 			dnsSrvRecordPortLabel:   dnsSrvRecordPort,
 			dnsMxRecordTargetLabel:  dnsMxRecordTarget,
+			dnsNsRecordTargetLabel:  dnsNsRecordTarget,
 		})
 	}
 

discovery/dns/dns_test.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/go-kit/log"
 	"github.com/miekg/dns"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/goleak"
@@ -81,6 +82,7 @@ func TestDNS(t *testing.T) {
 							"__meta_dns_srv_record_target": "",
 							"__meta_dns_srv_record_port":   "",
 							"__meta_dns_mx_record_target":  "",
+							"__meta_dns_ns_record_target":  "",
 						},
 					},
 				},
@@ -112,6 +114,7 @@ func TestDNS(t *testing.T) {
 							"__meta_dns_srv_record_target": "",
 							"__meta_dns_srv_record_port":   "",
 							"__meta_dns_mx_record_target":  "",
+							"__meta_dns_ns_record_target":  "",
 						},
 					},
 				},
@@ -143,6 +146,7 @@ func TestDNS(t *testing.T) {
 							"__meta_dns_srv_record_target": "db1.example.com.",
 							"__meta_dns_srv_record_port":   "3306",
 							"__meta_dns_mx_record_target":  "",
+							"__meta_dns_ns_record_target":  "",
 						},
 						{
 							"__address__":                  "db2.example.com:3306",
@@ -150,6 +154,7 @@ func TestDNS(t *testing.T) {
 							"__meta_dns_srv_record_target": "db2.example.com.",
 							"__meta_dns_srv_record_port":   "3306",
 							"__meta_dns_mx_record_target":  "",
+							"__meta_dns_ns_record_target":  "",
 						},
 					},
 				},
@@ -180,6 +185,7 @@ func TestDNS(t *testing.T) {
 							"__meta_dns_srv_record_target": "db1.example.com.",
 							"__meta_dns_srv_record_port":   "3306",
 							"__meta_dns_mx_record_target":  "",
+							"__meta_dns_ns_record_target":  "",
 						},
 					},
 				},
@@ -227,6 +233,7 @@ func TestDNS(t *testing.T) {
 							"__meta_dns_srv_record_target": "",
 							"__meta_dns_srv_record_port":   "",
 							"__meta_dns_mx_record_target":  "smtp1.example.com.",
+							"__meta_dns_ns_record_target":  "",
 						},
 						{
 							"__address__":                  "smtp2.example.com:25",
@@ -234,6 +241,7 @@ func TestDNS(t *testing.T) {
 							"__meta_dns_srv_record_target": "",
 							"__meta_dns_srv_record_port":   "",
 							"__meta_dns_mx_record_target":  "smtp2.example.com.",
+							"__meta_dns_ns_record_target":  "",
 						},
 					},
 				},
@@ -245,7 +253,8 @@ func TestDNS(t *testing.T) {
 		tc := tc
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
-			sd := NewDiscovery(tc.config, nil)
+			sd, err := NewDiscovery(tc.config, nil, prometheus.NewRegistry())
+			require.NoError(t, err)
 			sd.lookupFn = tc.lookup
 
 			tgs, err := sd.refresh(context.Background())

discovery/eureka/client_test.go

@@ -184,17 +184,17 @@ func TestFetchApps(t *testing.T) {
 	apps, err := fetchApps(context.TODO(), ts.URL, &http.Client{})
 	require.NoError(t, err)
 
-	require.Equal(t, len(apps.Applications), 2)
-	require.Equal(t, apps.Applications[0].Name, "CONFIG-SERVICE")
-	require.Equal(t, apps.Applications[1].Name, "META-SERVICE")
+	require.Len(t, apps.Applications, 2)
+	require.Equal(t, "CONFIG-SERVICE", apps.Applications[0].Name)
+	require.Equal(t, "META-SERVICE", apps.Applications[1].Name)
 
-	require.Equal(t, len(apps.Applications[1].Instances), 2)
-	require.Equal(t, apps.Applications[1].Instances[0].InstanceID, "meta-service002.test.com:meta-service:8080")
-	require.Equal(t, apps.Applications[1].Instances[0].Metadata.Items[0].XMLName.Local, "project")
-	require.Equal(t, apps.Applications[1].Instances[0].Metadata.Items[0].Content, "meta-service")
-	require.Equal(t, apps.Applications[1].Instances[0].Metadata.Items[1].XMLName.Local, "management.port")
-	require.Equal(t, apps.Applications[1].Instances[0].Metadata.Items[1].Content, "8090")
-	require.Equal(t, apps.Applications[1].Instances[1].InstanceID, "meta-service001.test.com:meta-service:8080")
+	require.Len(t, apps.Applications[1].Instances, 2)
+	require.Equal(t, "meta-service002.test.com:meta-service:8080", apps.Applications[1].Instances[0].InstanceID)
+	require.Equal(t, "project", apps.Applications[1].Instances[0].Metadata.Items[0].XMLName.Local)
+	require.Equal(t, "meta-service", apps.Applications[1].Instances[0].Metadata.Items[0].Content)
+	require.Equal(t, "management.port", apps.Applications[1].Instances[0].Metadata.Items[1].XMLName.Local)
+	require.Equal(t, "8090", apps.Applications[1].Instances[0].Metadata.Items[1].Content)
+	require.Equal(t, "meta-service001.test.com:meta-service:8080", apps.Applications[1].Instances[1].InstanceID)
 }
 
 func Test500ErrorHttpResponse(t *testing.T) {

discovery/eureka/eureka.go

@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 
@@ -80,7 +81,7 @@ func (*SDConfig) Name() string { return "eureka" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(c, opts.Logger)
+	return NewDiscovery(c, opts.Logger, opts.Registerer)
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -117,7 +118,7 @@ type Discovery struct {
 }
 
 // NewDiscovery creates a new Eureka discovery for the given role.
-func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
+func NewDiscovery(conf *SDConfig, logger log.Logger, reg prometheus.Registerer) (*Discovery, error) {
 	rt, err := config.NewRoundTripperFromConfig(conf.HTTPClientConfig, "eureka_sd")
 	if err != nil {
 		return nil, err
@@ -128,10 +129,13 @@ func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
 		server: conf.Server,
 	}
 	d.Discovery = refresh.NewDiscovery(
-		logger,
-		"eureka",
-		time.Duration(conf.RefreshInterval),
-		d.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "eureka",
+			Interval: time.Duration(conf.RefreshInterval),
+			RefreshF: d.refresh,
+			Registry: reg,
+		},
 	)
 	return d, nil
 }

discovery/eureka/eureka_test.go

@@ -20,6 +20,7 @@ import (
 	"net/http/httptest"
 	"testing"
 
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
 
@@ -35,7 +36,7 @@ func testUpdateServices(respHandler http.HandlerFunc) ([]*targetgroup.Group, err
 		Server: ts.URL,
 	}
 
-	md, err := NewDiscovery(&conf, nil)
+	md, err := NewDiscovery(&conf, nil, prometheus.NewRegistry())
 	if err != nil {
 		return nil, err
 	}
@@ -55,7 +56,7 @@ func TestEurekaSDHandleError(t *testing.T) {
 	tgs, err := testUpdateServices(respHandler)
 
 	require.EqualError(t, err, errTesting)
-	require.Equal(t, len(tgs), 0)
+	require.Empty(t, tgs)
 }
 
 func TestEurekaSDEmptyList(t *testing.T) {
@@ -72,7 +73,7 @@ func TestEurekaSDEmptyList(t *testing.T) {
 	)
 	tgs, err := testUpdateServices(respHandler)
 	require.NoError(t, err)
-	require.Equal(t, len(tgs), 1)
+	require.Len(t, tgs, 1)
 }
 
 func TestEurekaSDSendGroup(t *testing.T) {
@@ -232,11 +233,11 @@ func TestEurekaSDSendGroup(t *testing.T) {
 
 	tgs, err := testUpdateServices(respHandler)
 	require.NoError(t, err)
-	require.Equal(t, len(tgs), 1)
+	require.Len(t, tgs, 1)
 
 	tg := tgs[0]
-	require.Equal(t, tg.Source, "eureka")
-	require.Equal(t, len(tg.Targets), 4)
+	require.Equal(t, "eureka", tg.Source)
+	require.Len(t, tg.Targets, 4)
 
 	tgt := tg.Targets[0]
 	require.Equal(t, tgt[model.AddressLabel], model.LabelValue("config-service001.test.com:8080"))

discovery/file/file.go

@@ -39,24 +39,6 @@ import (
 )
 
 var (
-	fileSDReadErrorsCount = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "prometheus_sd_file_read_errors_total",
-			Help: "The number of File-SD read errors.",
-		})
-	fileSDScanDuration = prometheus.NewSummary(
-		prometheus.SummaryOpts{
-			Name:       "prometheus_sd_file_scan_duration_seconds",
-			Help:       "The duration of the File-SD scan in seconds.",
-			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-		})
-	fileSDTimeStamp        = NewTimestampCollector()
-	fileWatcherErrorsCount = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "prometheus_sd_file_watcher_errors_total",
-			Help: "The number of File-SD errors caused by filesystem watch failures.",
-		})
-
 	patFileSDName = regexp.MustCompile(`^[^*]*(\*[^/]*)?\.(json|yml|yaml|JSON|YML|YAML)$`)
 
 	// DefaultSDConfig is the default file SD configuration.
@@ -67,7 +49,6 @@ var (
 
 func init() {
 	discovery.RegisterConfig(&SDConfig{})
-	prometheus.MustRegister(fileSDReadErrorsCount, fileSDScanDuration, fileSDTimeStamp, fileWatcherErrorsCount)
 }
 
 // SDConfig is the configuration for file based discovery.
@@ -81,7 +62,7 @@ func (*SDConfig) Name() string { return "file" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(c, opts.Logger), nil
+	return NewDiscovery(c, opts.Logger, opts.Registerer)
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -187,10 +168,17 @@ type Discovery struct {
 	// This is used to detect deleted target groups.
 	lastRefresh map[string]int
 	logger      log.Logger
+
+	fileSDReadErrorsCount  prometheus.Counter
+	fileSDScanDuration     prometheus.Summary
+	fileWatcherErrorsCount prometheus.Counter
+	fileSDTimeStamp        *TimestampCollector
+
+	metricRegisterer discovery.MetricRegisterer
 }
 
 // NewDiscovery returns a new file discovery for the given paths.
-func NewDiscovery(conf *SDConfig, logger log.Logger) *Discovery {
+func NewDiscovery(conf *SDConfig, logger log.Logger, reg prometheus.Registerer) (*Discovery, error) {
 	if logger == nil {
 		logger = log.NewNopLogger()
 	}
@@ -200,9 +188,35 @@ func NewDiscovery(conf *SDConfig, logger log.Logger) *Discovery {
 		interval:   time.Duration(conf.RefreshInterval),
 		timestamps: make(map[string]float64),
 		logger:     logger,
+		fileSDReadErrorsCount: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Name: "prometheus_sd_file_read_errors_total",
+				Help: "The number of File-SD read errors.",
+			}),
+		fileSDScanDuration: prometheus.NewSummary(
+			prometheus.SummaryOpts{
+				Name:       "prometheus_sd_file_scan_duration_seconds",
+				Help:       "The duration of the File-SD scan in seconds.",
+				Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
+			}),
+		fileWatcherErrorsCount: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Name: "prometheus_sd_file_watcher_errors_total",
+				Help: "The number of File-SD errors caused by filesystem watch failures.",
+			}),
+		fileSDTimeStamp: NewTimestampCollector(),
 	}
-	fileSDTimeStamp.addDiscoverer(disc)
-	return disc
+
+	disc.fileSDTimeStamp.addDiscoverer(disc)
+
+	disc.metricRegisterer = discovery.NewMetricRegisterer(reg, []prometheus.Collector{
+		disc.fileSDReadErrorsCount,
+		disc.fileSDScanDuration,
+		disc.fileWatcherErrorsCount,
+		disc.fileSDTimeStamp,
+	})
+
+	return disc, nil
 }
 
 // listFiles returns a list of all files that match the configured patterns.
@@ -226,8 +240,8 @@ func (d *Discovery) watchFiles() {
 		panic("no watcher configured")
 	}
 	for _, p := range d.paths {
-		if idx := strings.LastIndex(p, "/"); idx > -1 {
-			p = p[:idx]
+		if dir, _ := filepath.Split(p); dir != "" {
+			p = dir
 		} else {
 			p = "./"
 		}
@@ -239,10 +253,17 @@ func (d *Discovery) watchFiles() {
 
 // Run implements the Discoverer interface.
 func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
+	err := d.metricRegisterer.RegisterMetrics()
+	if err != nil {
+		level.Error(d.logger).Log("msg", "Unable to register metrics", "err", err.Error())
+		return
+	}
+	defer d.metricRegisterer.UnregisterMetrics()
+
 	watcher, err := fsnotify.NewWatcher()
 	if err != nil {
 		level.Error(d.logger).Log("msg", "Error adding file watcher", "err", err)
-		fileWatcherErrorsCount.Inc()
+		d.fileWatcherErrorsCount.Inc()
 		return
 	}
 	d.watcher = watcher
@@ -306,7 +327,7 @@ func (d *Discovery) stop() {
 	done := make(chan struct{})
 	defer close(done)
 
-	fileSDTimeStamp.removeDiscoverer(d)
+	d.fileSDTimeStamp.removeDiscoverer(d)
 
 	// Closing the watcher will deadlock unless all events and errors are drained.
 	go func() {
@@ -332,13 +353,13 @@ func (d *Discovery) stop() {
 func (d *Discovery) refresh(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	t0 := time.Now()
 	defer func() {
-		fileSDScanDuration.Observe(time.Since(t0).Seconds())
+		d.fileSDScanDuration.Observe(time.Since(t0).Seconds())
 	}()
 	ref := map[string]int{}
 	for _, p := range d.listFiles() {
 		tgroups, err := d.readFile(p)
 		if err != nil {
-			fileSDReadErrorsCount.Inc()
+			d.fileSDReadErrorsCount.Inc()
 
 			level.Error(d.logger).Log("msg", "Error reading file", "path", p, "err", err)
 			// Prevent deletion down below.

discovery/file/file_test.go

@@ -24,6 +24,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/goleak"
@@ -143,7 +144,7 @@ func (t *testRunner) run(files ...string) {
 	ctx, cancel := context.WithCancel(context.Background())
 	t.cancelSD = cancel
 	go func() {
-		NewDiscovery(
+		d, err := NewDiscovery(
 			&SDConfig{
 				Files: files,
 				// Setting a high refresh interval to make sure that the tests only
@@ -151,7 +152,11 @@ func (t *testRunner) run(files ...string) {
 				RefreshInterval: model.Duration(1 * time.Hour),
 			},
 			nil,
-		).Run(ctx, t.ch)
+			prometheus.NewRegistry(),
+		)
+		require.NoError(t, err)
+
+		d.Run(ctx, t.ch)
 	}()
 }
 

discovery/gce/gce.go

@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	"golang.org/x/oauth2/google"
 	"google.golang.org/api/compute/v1"
@@ -86,7 +87,7 @@ func (*SDConfig) Name() string { return "gce" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(*c, opts.Logger)
+	return NewDiscovery(*c, opts.Logger, opts.Registerer)
 }
 
 // UnmarshalYAML implements the yaml.Unmarshaler interface.
@@ -121,7 +122,7 @@ type Discovery struct {
 }
 
 // NewDiscovery returns a new Discovery which periodically refreshes its targets.
-func NewDiscovery(conf SDConfig, logger log.Logger) (*Discovery, error) {
+func NewDiscovery(conf SDConfig, logger log.Logger, reg prometheus.Registerer) (*Discovery, error) {
 	d := &Discovery{
 		project:      conf.Project,
 		zone:         conf.Zone,
@@ -141,10 +142,13 @@ func NewDiscovery(conf SDConfig, logger log.Logger) (*Discovery, error) {
 	d.isvc = compute.NewInstancesService(d.svc)
 
 	d.Discovery = refresh.NewDiscovery(
-		logger,
-		"gce",
-		time.Duration(conf.RefreshInterval),
-		d.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "gce",
+			Interval: time.Duration(conf.RefreshInterval),
+			RefreshF: d.refresh,
+			Registry: reg,
+		},
 	)
 	return d, nil
 }

discovery/hetzner/hcloud.go

@@ -22,7 +22,7 @@ import (
 	"time"
 
 	"github.com/go-kit/log"
-	"github.com/hetznercloud/hcloud-go/hcloud"
+	"github.com/hetznercloud/hcloud-go/v2/hcloud"
 	"github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/common/version"
@@ -91,7 +91,7 @@ func (d *hcloudDiscovery) refresh(ctx context.Context) ([]*targetgroup.Group, er
 	targets := make([]model.LabelSet, len(servers))
 	for i, server := range servers {
 		labels := model.LabelSet{
-			hetznerLabelRole:              model.LabelValue(hetznerRoleHcloud),
+			hetznerLabelRole:              model.LabelValue(HetznerRoleHcloud),
 			hetznerLabelServerID:          model.LabelValue(fmt.Sprintf("%d", server.ID)),
 			hetznerLabelServerName:        model.LabelValue(server.Name),
 			hetznerLabelDatacenter:        model.LabelValue(server.Datacenter.Name),

discovery/hetzner/hcloud_test.go

@@ -48,12 +48,12 @@ func TestHCloudSDRefresh(t *testing.T) {
 
 	targetGroups, err := d.refresh(context.Background())
 	require.NoError(t, err)
-	require.Equal(t, 1, len(targetGroups))
+	require.Len(t, targetGroups, 1)
 
 	targetGroup := targetGroups[0]
 	require.NotNil(t, targetGroup, "targetGroup should not be nil")
 	require.NotNil(t, targetGroup.Targets, "targetGroup.targets should not be nil")
-	require.Equal(t, 3, len(targetGroup.Targets))
+	require.Len(t, targetGroup.Targets, 3)
 
 	for i, labelSet := range []model.LabelSet{
 		{

discovery/hetzner/hetzner.go

@@ -20,7 +20,8 @@ import (
 	"time"
 
 	"github.com/go-kit/log"
-	"github.com/hetznercloud/hcloud-go/hcloud"
+	"github.com/hetznercloud/hcloud-go/v2/hcloud"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 
@@ -57,7 +58,7 @@ type SDConfig struct {
 
 	RefreshInterval model.Duration `yaml:"refresh_interval"`
 	Port            int            `yaml:"port"`
-	Role            role           `yaml:"role"`
+	Role            Role           `yaml:"role"`
 	hcloudEndpoint  string         // For tests only.
 	robotEndpoint   string         // For tests only.
 }
@@ -67,33 +68,33 @@ func (*SDConfig) Name() string { return "hetzner" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(c, opts.Logger)
+	return NewDiscovery(c, opts.Logger, opts.Registerer)
 }
 
 type refresher interface {
 	refresh(context.Context) ([]*targetgroup.Group, error)
 }
 
-// role is the role of the target within the Hetzner Ecosystem.
-type role string
+// Role is the Role of the target within the Hetzner Ecosystem.
+type Role string
 
 // The valid options for role.
 const (
 	// Hetzner Robot Role (Dedicated Server)
 	// https://robot.hetzner.com
-	hetznerRoleRobot role = "robot"
+	HetznerRoleRobot Role = "robot"
 	// Hetzner Cloud Role
 	// https://console.hetzner.cloud
-	hetznerRoleHcloud role = "hcloud"
+	HetznerRoleHcloud Role = "hcloud"
 )
 
 // UnmarshalYAML implements the yaml.Unmarshaler interface.
-func (c *role) UnmarshalYAML(unmarshal func(interface{}) error) error {
+func (c *Role) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	if err := unmarshal((*string)(c)); err != nil {
 		return err
 	}
 	switch *c {
-	case hetznerRoleRobot, hetznerRoleHcloud:
+	case HetznerRoleRobot, HetznerRoleHcloud:
 		return nil
 	default:
 		return fmt.Errorf("unknown role %q", *c)
@@ -127,28 +128,31 @@ type Discovery struct {
 }
 
 // NewDiscovery returns a new Discovery which periodically refreshes its targets.
-func NewDiscovery(conf *SDConfig, logger log.Logger) (*refresh.Discovery, error) {
+func NewDiscovery(conf *SDConfig, logger log.Logger, reg prometheus.Registerer) (*refresh.Discovery, error) {
 	r, err := newRefresher(conf, logger)
 	if err != nil {
 		return nil, err
 	}
 
 	return refresh.NewDiscovery(
-		logger,
-		"hetzner",
-		time.Duration(conf.RefreshInterval),
-		r.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "hetzner",
+			Interval: time.Duration(conf.RefreshInterval),
+			RefreshF: r.refresh,
+			Registry: reg,
+		},
 	), nil
 }
 
 func newRefresher(conf *SDConfig, l log.Logger) (refresher, error) {
 	switch conf.Role {
-	case hetznerRoleHcloud:
+	case HetznerRoleHcloud:
 		if conf.hcloudEndpoint == "" {
 			conf.hcloudEndpoint = hcloud.Endpoint
 		}
 		return newHcloudDiscovery(conf, l)
-	case hetznerRoleRobot:
+	case HetznerRoleRobot:
 		if conf.robotEndpoint == "" {
 			conf.robotEndpoint = "https://robot-ws.your-server.de"
 		}

discovery/hetzner/mock_test.go

@@ -20,7 +20,7 @@ import (
 	"testing"
 )
 
-// SDMock is the interface for the Hetzner Cloud mock
+// SDMock is the interface for the Hetzner Cloud mock.
 type SDMock struct {
 	t      *testing.T
 	Server *httptest.Server
@@ -34,19 +34,19 @@ func NewSDMock(t *testing.T) *SDMock {
 	}
 }
 
-// Endpoint returns the URI to the mock server
+// Endpoint returns the URI to the mock server.
 func (m *SDMock) Endpoint() string {
 	return m.Server.URL + "/"
 }
 
-// Setup creates the mock server
+// Setup creates the mock server.
 func (m *SDMock) Setup() {
 	m.Mux = http.NewServeMux()
 	m.Server = httptest.NewServer(m.Mux)
 	m.t.Cleanup(m.Server.Close)
 }
 
-// ShutdownServer creates the mock server
+// ShutdownServer creates the mock server.
 func (m *SDMock) ShutdownServer() {
 	m.Server.Close()
 }

discovery/hetzner/robot.go

@@ -105,7 +105,7 @@ func (d *robotDiscovery) refresh(context.Context) ([]*targetgroup.Group, error)
 	targets := make([]model.LabelSet, len(servers))
 	for i, server := range servers {
 		labels := model.LabelSet{
-			hetznerLabelRole:           model.LabelValue(hetznerRoleRobot),
+			hetznerLabelRole:           model.LabelValue(HetznerRoleRobot),
 			hetznerLabelServerID:       model.LabelValue(strconv.Itoa(server.Server.ServerNumber)),
 			hetznerLabelServerName:     model.LabelValue(server.Server.ServerName),
 			hetznerLabelDatacenter:     model.LabelValue(strings.ToLower(server.Server.Dc)),

discovery/hetzner/robot_test.go

@@ -47,12 +47,12 @@ func TestRobotSDRefresh(t *testing.T) {
 
 	targetGroups, err := d.refresh(context.Background())
 	require.NoError(t, err)
-	require.Equal(t, 1, len(targetGroups))
+	require.Len(t, targetGroups, 1)
 
 	targetGroup := targetGroups[0]
 	require.NotNil(t, targetGroup, "targetGroup should not be nil")
 	require.NotNil(t, targetGroup.Targets, "targetGroup.targets should not be nil")
-	require.Equal(t, 2, len(targetGroup.Targets))
+	require.Len(t, targetGroup.Targets, 2)
 
 	for i, labelSet := range []model.LabelSet{
 		{
@@ -98,5 +98,5 @@ func TestRobotSDRefreshHandleError(t *testing.T) {
 	require.Error(t, err)
 	require.Equal(t, "non 2xx status '401' response during hetzner service discovery with role robot", err.Error())
 
-	require.Equal(t, 0, len(targetGroups))
+	require.Empty(t, targetGroups)
 }

discovery/http/http.go

@@ -45,17 +45,10 @@ var (
 	}
 	userAgent        = fmt.Sprintf("Prometheus/%s", version.Version)
 	matchContentType = regexp.MustCompile(`^(?i:application\/json(;\s*charset=("utf-8"|utf-8))?)$`)
-
-	failuresCount = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "prometheus_sd_http_failures_total",
-			Help: "Number of HTTP service discovery refresh failures.",
-		})
 )
 
 func init() {
 	discovery.RegisterConfig(&SDConfig{})
-	prometheus.MustRegister(failuresCount)
 }
 
 // SDConfig is the configuration for HTTP based discovery.
@@ -70,7 +63,7 @@ func (*SDConfig) Name() string { return "http" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(c, opts.Logger, opts.HTTPClientOptions)
+	return NewDiscovery(c, opts.Logger, opts.HTTPClientOptions, opts.Registerer)
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -99,7 +92,7 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	if parsedURL.Host == "" {
 		return fmt.Errorf("host is missing in URL")
 	}
-	return nil
+	return c.HTTPClientConfig.Validate()
 }
 
 const httpSDURLLabel = model.MetaLabelPrefix + "url"
@@ -112,10 +105,11 @@ type Discovery struct {
 	client          *http.Client
 	refreshInterval time.Duration
 	tgLastLength    int
+	failuresCount   prometheus.Counter
 }
 
 // NewDiscovery returns a new HTTP discovery for the given config.
-func NewDiscovery(conf *SDConfig, logger log.Logger, clientOpts []config.HTTPClientOption) (*Discovery, error) {
+func NewDiscovery(conf *SDConfig, logger log.Logger, clientOpts []config.HTTPClientOption, reg prometheus.Registerer) (*Discovery, error) {
 	if logger == nil {
 		logger = log.NewNopLogger()
 	}
@@ -130,13 +124,22 @@ func NewDiscovery(conf *SDConfig, logger log.Logger, clientOpts []config.HTTPCli
 		url:             conf.URL,
 		client:          client,
 		refreshInterval: time.Duration(conf.RefreshInterval), // Stored to be sent as headers.
+		failuresCount: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Name: "prometheus_sd_http_failures_total",
+				Help: "Number of HTTP service discovery refresh failures.",
+			}),
 	}
 
 	d.Discovery = refresh.NewDiscovery(
-		logger,
-		"http",
-		time.Duration(conf.RefreshInterval),
-		d.Refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "http",
+			Interval: time.Duration(conf.RefreshInterval),
+			RefreshF: d.Refresh,
+			Registry: reg,
+			Metrics:  []prometheus.Collector{d.failuresCount},
+		},
 	)
 	return d, nil
 }
@@ -152,7 +155,7 @@ func (d *Discovery) Refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 
 	resp, err := d.client.Do(req.WithContext(ctx))
 	if err != nil {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, err
 	}
 	defer func() {
@@ -161,31 +164,31 @@ func (d *Discovery) Refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 	}()
 
 	if resp.StatusCode != http.StatusOK {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, fmt.Errorf("server returned HTTP status %s", resp.Status)
 	}
 
 	if !matchContentType.MatchString(strings.TrimSpace(resp.Header.Get("Content-Type"))) {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, fmt.Errorf("unsupported content type %q", resp.Header.Get("Content-Type"))
 	}
 
 	b, err := io.ReadAll(resp.Body)
 	if err != nil {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, err
 	}
 
 	var targetGroups []*targetgroup.Group
 
 	if err := json.Unmarshal(b, &targetGroups); err != nil {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, err
 	}
 
 	for i, tg := range targetGroups {
 		if tg == nil {
-			failuresCount.Inc()
+			d.failuresCount.Inc()
 			err = errors.New("nil target group item found")
 			return nil, err
 		}

discovery/http/http_test.go

@@ -41,7 +41,7 @@ func TestHTTPValidRefresh(t *testing.T) {
 		RefreshInterval:  model.Duration(30 * time.Second),
 	}
 
-	d, err := NewDiscovery(&cfg, log.NewNopLogger(), nil)
+	d, err := NewDiscovery(&cfg, log.NewNopLogger(), nil, prometheus.NewRegistry())
 	require.NoError(t, err)
 
 	ctx := context.Background()
@@ -62,8 +62,8 @@ func TestHTTPValidRefresh(t *testing.T) {
 			Source: urlSource(ts.URL+"/http_sd.good.json", 0),
 		},
 	}
-	require.Equal(t, tgs, expectedTargets)
-	require.Equal(t, 0.0, getFailureCount())
+	require.Equal(t, expectedTargets, tgs)
+	require.Equal(t, 0.0, getFailureCount(d.failuresCount))
 }
 
 func TestHTTPInvalidCode(t *testing.T) {
@@ -79,13 +79,13 @@ func TestHTTPInvalidCode(t *testing.T) {
 		RefreshInterval:  model.Duration(30 * time.Second),
 	}
 
-	d, err := NewDiscovery(&cfg, log.NewNopLogger(), nil)
+	d, err := NewDiscovery(&cfg, log.NewNopLogger(), nil, prometheus.NewRegistry())
 	require.NoError(t, err)
 
 	ctx := context.Background()
 	_, err = d.Refresh(ctx)
 	require.EqualError(t, err, "server returned HTTP status 400 Bad Request")
-	require.Equal(t, 1.0, getFailureCount())
+	require.Equal(t, 1.0, getFailureCount(d.failuresCount))
 }
 
 func TestHTTPInvalidFormat(t *testing.T) {
@@ -101,18 +101,16 @@ func TestHTTPInvalidFormat(t *testing.T) {
 		RefreshInterval:  model.Duration(30 * time.Second),
 	}
 
-	d, err := NewDiscovery(&cfg, log.NewNopLogger(), nil)
+	d, err := NewDiscovery(&cfg, log.NewNopLogger(), nil, prometheus.NewRegistry())
 	require.NoError(t, err)
 
 	ctx := context.Background()
 	_, err = d.Refresh(ctx)
 	require.EqualError(t, err, `unsupported content type "text/plain; charset=utf-8"`)
-	require.Equal(t, 1.0, getFailureCount())
+	require.Equal(t, 1.0, getFailureCount(d.failuresCount))
 }
 
-var lastFailureCount float64
-
-func getFailureCount() float64 {
+func getFailureCount(failuresCount prometheus.Counter) float64 {
 	failureChan := make(chan prometheus.Metric)
 
 	go func() {
@@ -129,10 +127,7 @@ func getFailureCount() float64 {
 		metric.Write(&counter)
 	}
 
-	// account for failures in prior tests
-	count := *counter.Counter.Value - lastFailureCount
-	lastFailureCount = *counter.Counter.Value
-	return count
+	return *counter.Counter.Value
 }
 
 func TestContentTypeRegex(t *testing.T) {
@@ -417,7 +412,7 @@ func TestSourceDisappeared(t *testing.T) {
 		URL:              ts.URL,
 		RefreshInterval:  model.Duration(1 * time.Second),
 	}
-	d, err := NewDiscovery(&cfg, log.NewNopLogger(), nil)
+	d, err := NewDiscovery(&cfg, log.NewNopLogger(), nil, prometheus.NewRegistry())
 	require.NoError(t, err)
 	for _, test := range cases {
 		ctx := context.Background()

discovery/ionos/ionos.go

@@ -14,15 +14,17 @@
 package ionos
 
 import (
+	"errors"
 	"time"
 
 	"github.com/go-kit/log"
-	"github.com/pkg/errors"
 	"github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 
 	"github.com/prometheus/prometheus/discovery"
 	"github.com/prometheus/prometheus/discovery/refresh"
+
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 const (
@@ -41,7 +43,7 @@ func init() {
 type Discovery struct{}
 
 // NewDiscovery returns a new refresh.Discovery for IONOS Cloud.
-func NewDiscovery(conf *SDConfig, logger log.Logger) (*refresh.Discovery, error) {
+func NewDiscovery(conf *SDConfig, logger log.Logger, reg prometheus.Registerer) (*refresh.Discovery, error) {
 	if conf.ionosEndpoint == "" {
 		conf.ionosEndpoint = "https://api.ionos.com"
 	}
@@ -52,10 +54,13 @@ func NewDiscovery(conf *SDConfig, logger log.Logger) (*refresh.Discovery, error)
 	}
 
 	return refresh.NewDiscovery(
-		logger,
-		"ionos",
-		time.Duration(conf.RefreshInterval),
-		d.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "ionos",
+			Interval: time.Duration(conf.RefreshInterval),
+			RefreshF: d.refresh,
+			Registry: reg,
+		},
 	), nil
 }
 
@@ -86,7 +91,7 @@ func (c SDConfig) Name() string {
 
 // NewDiscoverer returns a new discovery.Discoverer for IONOS Cloud.
 func (c SDConfig) NewDiscoverer(options discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(&c, options.Logger)
+	return NewDiscovery(&c, options.Logger, options.Registerer)
 }
 
 // UnmarshalYAML implements the yaml.Unmarshaler interface.

discovery/ionos/server_test.go

@@ -48,12 +48,12 @@ func TestIONOSServerRefresh(t *testing.T) {
 	tgs, err := d.refresh(ctx)
 	require.NoError(t, err)
 
-	require.Equal(t, 1, len(tgs))
+	require.Len(t, tgs, 1)
 
 	tg := tgs[0]
 	require.NotNil(t, tg)
 	require.NotNil(t, tg.Targets)
-	require.Equal(t, 2, len(tg.Targets))
+	require.Len(t, tg.Targets, 2)
 
 	for i, lbls := range []model.LabelSet{
 		{

discovery/kubernetes/endpoints.go

@@ -11,7 +11,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// nolint:revive // Many legitimately empty blocks in this file.
 package kubernetes
 
 import (
@@ -23,19 +22,13 @@ import (
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	apiv1 "k8s.io/api/core/v1"
 	"k8s.io/client-go/tools/cache"
 	"k8s.io/client-go/util/workqueue"
 
 	"github.com/prometheus/prometheus/discovery/targetgroup"
-	"github.com/prometheus/prometheus/util/strutil"
-)
-
-var (
-	epAddCount    = eventCount.WithLabelValues("endpoints", "add")
-	epUpdateCount = eventCount.WithLabelValues("endpoints", "update")
-	epDeleteCount = eventCount.WithLabelValues("endpoints", "delete")
 )
 
 // Endpoints discovers new endpoint targets.
@@ -56,10 +49,19 @@ type Endpoints struct {
 }
 
 // NewEndpoints returns a new endpoints discovery.
-func NewEndpoints(l log.Logger, eps cache.SharedIndexInformer, svc, pod, node cache.SharedInformer) *Endpoints {
+func NewEndpoints(l log.Logger, eps cache.SharedIndexInformer, svc, pod, node cache.SharedInformer, eventCount *prometheus.CounterVec) *Endpoints {
 	if l == nil {
 		l = log.NewNopLogger()
 	}
+
+	epAddCount := eventCount.WithLabelValues(RoleEndpoint.String(), MetricLabelRoleAdd)
+	epUpdateCount := eventCount.WithLabelValues(RoleEndpoint.String(), MetricLabelRoleUpdate)
+	epDeleteCount := eventCount.WithLabelValues(RoleEndpoint.String(), MetricLabelRoleDelete)
+
+	svcAddCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleAdd)
+	svcUpdateCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleUpdate)
+	svcDeleteCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleDelete)
+
 	e := &Endpoints{
 		logger:           l,
 		endpointsInf:     eps,
@@ -70,7 +72,7 @@ func NewEndpoints(l log.Logger, eps cache.SharedIndexInformer, svc, pod, node ca
 		podStore:         pod.GetStore(),
 		nodeInf:          node,
 		withNodeMetadata: node != nil,
-		queue:            workqueue.NewNamed("endpoints"),
+		queue:            workqueue.NewNamed(RoleEndpoint.String()),
 	}
 
 	_, err := e.endpointsInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
@@ -248,9 +250,6 @@ func endpointsSourceFromNamespaceAndName(namespace, name string) string {
 }
 
 const (
-	endpointsLabelPrefix           = metaLabelPrefix + "endpoints_label_"
-	endpointsLabelPresentPrefix    = metaLabelPrefix + "endpoints_labelpresent_"
-	endpointsNameLabel             = metaLabelPrefix + "endpoints_name"
 	endpointNodeName               = metaLabelPrefix + "endpoint_node_name"
 	endpointHostname               = metaLabelPrefix + "endpoint_hostname"
 	endpointReadyLabel             = metaLabelPrefix + "endpoint_ready"
@@ -265,16 +264,11 @@ func (e *Endpoints) buildEndpoints(eps *apiv1.Endpoints) *targetgroup.Group {
 		Source: endpointsSource(eps),
 	}
 	tg.Labels = model.LabelSet{
-		namespaceLabel:     lv(eps.Namespace),
-		endpointsNameLabel: lv(eps.Name),
+		namespaceLabel: lv(eps.Namespace),
 	}
 	e.addServiceLabels(eps.Namespace, eps.Name, tg)
 	// Add endpoints labels metadata.
-	for k, v := range eps.Labels {
-		ln := strutil.SanitizeLabelName(k)
-		tg.Labels[model.LabelName(endpointsLabelPrefix+ln)] = lv(v)
-		tg.Labels[model.LabelName(endpointsLabelPresentPrefix+ln)] = presentValue
-	}
+	addObjectMetaLabels(tg.Labels, eps.ObjectMeta, RoleEndpoint)
 
 	type podEntry struct {
 		pod          *apiv1.Pod
@@ -305,7 +299,11 @@ func (e *Endpoints) buildEndpoints(eps *apiv1.Endpoints) *targetgroup.Group {
 		}
 
 		if e.withNodeMetadata {
-			target = addNodeLabels(target, e.nodeInf, e.logger, addr.NodeName)
+			if addr.NodeName != nil {
+				target = addNodeLabels(target, e.nodeInf, e.logger, addr.NodeName)
+			} else if addr.TargetRef != nil && addr.TargetRef.Kind == "Node" {
+				target = addNodeLabels(target, e.nodeInf, e.logger, &addr.TargetRef.Name)
+			}
 		}
 
 		pod := e.resolvePodRef(addr.TargetRef)
@@ -385,18 +383,21 @@ func (e *Endpoints) buildEndpoints(eps *apiv1.Endpoints) *targetgroup.Group {
 					continue
 				}
 
-				a := net.JoinHostPort(pe.pod.Status.PodIP, strconv.FormatUint(uint64(cport.ContainerPort), 10))
-				ports := strconv.FormatUint(uint64(cport.ContainerPort), 10)
+				// PodIP can be empty when a pod is starting or has been evicted.
+				if len(pe.pod.Status.PodIP) != 0 {
+					a := net.JoinHostPort(pe.pod.Status.PodIP, strconv.FormatUint(uint64(cport.ContainerPort), 10))
+					ports := strconv.FormatUint(uint64(cport.ContainerPort), 10)
 
-				target := model.LabelSet{
-					model.AddressLabel:            lv(a),
-					podContainerNameLabel:         lv(c.Name),
-					podContainerImageLabel:        lv(c.Image),
-					podContainerPortNameLabel:     lv(cport.Name),
-					podContainerPortNumberLabel:   lv(ports),
-					podContainerPortProtocolLabel: lv(string(cport.Protocol)),
+					target := model.LabelSet{
+						model.AddressLabel:            lv(a),
+						podContainerNameLabel:         lv(c.Name),
+						podContainerImageLabel:        lv(c.Image),
+						podContainerPortNameLabel:     lv(cport.Name),
+						podContainerPortNumberLabel:   lv(ports),
+						podContainerPortProtocolLabel: lv(string(cport.Protocol)),
+					}
+					tg.Targets = append(tg.Targets, target.Merge(podLabels(pe.pod)))
 				}
-				tg.Targets = append(tg.Targets, target.Merge(podLabels(pe.pod)))
 			}
 		}
 	}
@@ -458,13 +459,7 @@ func addNodeLabels(tg model.LabelSet, nodeInf cache.SharedInformer, logger log.L
 
 	node := obj.(*apiv1.Node)
 	// Allocate one target label for the node name,
-	// and two target labels for each node label.
-	nodeLabelset := make(model.LabelSet, 1+2*len(node.GetLabels()))
-	nodeLabelset[nodeNameLabel] = lv(*nodeName)
-	for k, v := range node.GetLabels() {
-		ln := strutil.SanitizeLabelName(k)
-		nodeLabelset[model.LabelName(nodeLabelPrefix+ln)] = lv(v)
-		nodeLabelset[model.LabelName(nodeLabelPresentPrefix+ln)] = presentValue
-	}
+	nodeLabelset := make(model.LabelSet)
+	addObjectMetaLabels(nodeLabelset, node.ObjectMeta, RoleNode)
 	return tg.Merge(nodeLabelset)
 }

discovery/kubernetes/endpoints_test.go

@@ -32,6 +32,9 @@ func makeEndpoints() *v1.Endpoints {
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      "testendpoints",
 			Namespace: "default",
+			Annotations: map[string]string{
+				"test.annotation": "test",
+			},
 		},
 		Subsets: []v1.EndpointSubset{
 			{
@@ -69,6 +72,24 @@ func makeEndpoints() *v1.Endpoints {
 					},
 				},
 			},
+			{
+				Addresses: []v1.EndpointAddress{
+					{
+						IP: "6.7.8.9",
+						TargetRef: &v1.ObjectReference{
+							Kind: "Node",
+							Name: "barbaz",
+						},
+					},
+				},
+				Ports: []v1.EndpointPort{
+					{
+						Name:     "testport",
+						Port:     9002,
+						Protocol: v1.ProtocolTCP,
+					},
+				},
+			},
 		},
 	}
 }
@@ -106,10 +127,20 @@ func TestEndpointsDiscoveryBeforeRun(t *testing.T) {
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "false",
 					},
+					{
+						"__address__": "6.7.8.9:9002",
+						"__meta_kubernetes_endpoint_address_target_kind": "Node",
+						"__meta_kubernetes_endpoint_address_target_name": "barbaz",
+						"__meta_kubernetes_endpoint_port_name":           "testport",
+						"__meta_kubernetes_endpoint_port_protocol":       "TCP",
+						"__meta_kubernetes_endpoint_ready":               "true",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_namespace":      "default",
-					"__meta_kubernetes_endpoints_name": "testendpoints",
+					"__meta_kubernetes_namespace":                                   "default",
+					"__meta_kubernetes_endpoints_name":                              "testendpoints",
+					"__meta_kubernetes_endpoints_annotation_test_annotation":        "test",
+					"__meta_kubernetes_endpoints_annotationpresent_test_annotation": "true",
 				},
 				Source: "endpoints/default/testendpoints",
 			},
@@ -398,13 +429,23 @@ func TestEndpointsDiscoveryWithService(t *testing.T) {
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "false",
 					},
+					{
+						"__address__": "6.7.8.9:9002",
+						"__meta_kubernetes_endpoint_address_target_kind": "Node",
+						"__meta_kubernetes_endpoint_address_target_name": "barbaz",
+						"__meta_kubernetes_endpoint_port_name":           "testport",
+						"__meta_kubernetes_endpoint_port_protocol":       "TCP",
+						"__meta_kubernetes_endpoint_ready":               "true",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_namespace":                     "default",
-					"__meta_kubernetes_endpoints_name":                "testendpoints",
-					"__meta_kubernetes_service_label_app_name":        "test",
-					"__meta_kubernetes_service_labelpresent_app_name": "true",
-					"__meta_kubernetes_service_name":                  "testendpoints",
+					"__meta_kubernetes_namespace":                                   "default",
+					"__meta_kubernetes_endpoints_name":                              "testendpoints",
+					"__meta_kubernetes_service_label_app_name":                      "test",
+					"__meta_kubernetes_service_labelpresent_app_name":               "true",
+					"__meta_kubernetes_service_name":                                "testendpoints",
+					"__meta_kubernetes_endpoints_annotation_test_annotation":        "test",
+					"__meta_kubernetes_endpoints_annotationpresent_test_annotation": "true",
 				},
 				Source: "endpoints/default/testendpoints",
 			},
@@ -466,15 +507,25 @@ func TestEndpointsDiscoveryWithServiceUpdate(t *testing.T) {
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "false",
 					},
+					{
+						"__address__": "6.7.8.9:9002",
+						"__meta_kubernetes_endpoint_address_target_kind": "Node",
+						"__meta_kubernetes_endpoint_address_target_name": "barbaz",
+						"__meta_kubernetes_endpoint_port_name":           "testport",
+						"__meta_kubernetes_endpoint_port_protocol":       "TCP",
+						"__meta_kubernetes_endpoint_ready":               "true",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_namespace":                      "default",
-					"__meta_kubernetes_endpoints_name":                 "testendpoints",
-					"__meta_kubernetes_service_label_app_name":         "svc",
-					"__meta_kubernetes_service_labelpresent_app_name":  "true",
-					"__meta_kubernetes_service_name":                   "testendpoints",
-					"__meta_kubernetes_service_label_component":        "testing",
-					"__meta_kubernetes_service_labelpresent_component": "true",
+					"__meta_kubernetes_namespace":                                   "default",
+					"__meta_kubernetes_endpoints_name":                              "testendpoints",
+					"__meta_kubernetes_service_label_app_name":                      "svc",
+					"__meta_kubernetes_service_labelpresent_app_name":               "true",
+					"__meta_kubernetes_service_name":                                "testendpoints",
+					"__meta_kubernetes_service_label_component":                     "testing",
+					"__meta_kubernetes_service_labelpresent_component":              "true",
+					"__meta_kubernetes_endpoints_annotation_test_annotation":        "test",
+					"__meta_kubernetes_endpoints_annotationpresent_test_annotation": "true",
 				},
 				Source: "endpoints/default/testendpoints",
 			},
@@ -484,8 +535,10 @@ func TestEndpointsDiscoveryWithServiceUpdate(t *testing.T) {
 
 func TestEndpointsDiscoveryWithNodeMetadata(t *testing.T) {
 	metadataConfig := AttachMetadataConfig{Node: true}
-	nodeLabels := map[string]string{"az": "us-east1"}
-	node := makeNode("foobar", "", "", nodeLabels, nil)
+	nodeLabels1 := map[string]string{"az": "us-east1"}
+	nodeLabels2 := map[string]string{"az": "us-west2"}
+	node1 := makeNode("foobar", "", "", nodeLabels1, nil)
+	node2 := makeNode("barbaz", "", "", nodeLabels2, nil)
 	svc := &v1.Service{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      "testendpoints",
@@ -495,7 +548,7 @@ func TestEndpointsDiscoveryWithNodeMetadata(t *testing.T) {
 			},
 		},
 	}
-	n, _ := makeDiscoveryWithMetadata(RoleEndpoint, NamespaceDiscovery{}, metadataConfig, makeEndpoints(), svc, node)
+	n, _ := makeDiscoveryWithMetadata(RoleEndpoint, NamespaceDiscovery{}, metadataConfig, makeEndpoints(), svc, node1, node2)
 
 	k8sDiscoveryTest{
 		discovery:        n,
@@ -526,13 +579,26 @@ func TestEndpointsDiscoveryWithNodeMetadata(t *testing.T) {
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "false",
 					},
+					{
+						"__address__": "6.7.8.9:9002",
+						"__meta_kubernetes_endpoint_address_target_kind": "Node",
+						"__meta_kubernetes_endpoint_address_target_name": "barbaz",
+						"__meta_kubernetes_endpoint_port_name":           "testport",
+						"__meta_kubernetes_endpoint_port_protocol":       "TCP",
+						"__meta_kubernetes_endpoint_ready":               "true",
+						"__meta_kubernetes_node_label_az":                "us-west2",
+						"__meta_kubernetes_node_labelpresent_az":         "true",
+						"__meta_kubernetes_node_name":                    "barbaz",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_namespace":                     "default",
-					"__meta_kubernetes_endpoints_name":                "testendpoints",
-					"__meta_kubernetes_service_label_app_name":        "test",
-					"__meta_kubernetes_service_labelpresent_app_name": "true",
-					"__meta_kubernetes_service_name":                  "testendpoints",
+					"__meta_kubernetes_namespace":                                   "default",
+					"__meta_kubernetes_endpoints_name":                              "testendpoints",
+					"__meta_kubernetes_service_label_app_name":                      "test",
+					"__meta_kubernetes_service_labelpresent_app_name":               "true",
+					"__meta_kubernetes_service_name":                                "testendpoints",
+					"__meta_kubernetes_endpoints_annotation_test_annotation":        "test",
+					"__meta_kubernetes_endpoints_annotationpresent_test_annotation": "true",
 				},
 				Source: "endpoints/default/testendpoints",
 			},
@@ -541,8 +607,10 @@ func TestEndpointsDiscoveryWithNodeMetadata(t *testing.T) {
 }
 
 func TestEndpointsDiscoveryWithUpdatedNodeMetadata(t *testing.T) {
-	nodeLabels := map[string]string{"az": "us-east1"}
-	nodes := makeNode("foobar", "", "", nodeLabels, nil)
+	nodeLabels1 := map[string]string{"az": "us-east1"}
+	nodeLabels2 := map[string]string{"az": "us-west2"}
+	node1 := makeNode("foobar", "", "", nodeLabels1, nil)
+	node2 := makeNode("barbaz", "", "", nodeLabels2, nil)
 	metadataConfig := AttachMetadataConfig{Node: true}
 	svc := &v1.Service{
 		ObjectMeta: metav1.ObjectMeta{
@@ -553,13 +621,13 @@ func TestEndpointsDiscoveryWithUpdatedNodeMetadata(t *testing.T) {
 			},
 		},
 	}
-	n, c := makeDiscoveryWithMetadata(RoleEndpoint, NamespaceDiscovery{}, metadataConfig, makeEndpoints(), nodes, svc)
+	n, c := makeDiscoveryWithMetadata(RoleEndpoint, NamespaceDiscovery{}, metadataConfig, makeEndpoints(), node1, node2, svc)
 
 	k8sDiscoveryTest{
 		discovery: n,
 		afterStart: func() {
-			nodes.Labels["az"] = "eu-central1"
-			c.CoreV1().Nodes().Update(context.Background(), nodes, metav1.UpdateOptions{})
+			node1.Labels["az"] = "eu-central1"
+			c.CoreV1().Nodes().Update(context.Background(), node1, metav1.UpdateOptions{})
 		},
 		expectedMaxItems: 2,
 		expectedRes: map[string]*targetgroup.Group{
@@ -572,7 +640,7 @@ func TestEndpointsDiscoveryWithUpdatedNodeMetadata(t *testing.T) {
 						"__meta_kubernetes_endpoint_port_name":     "testport",
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "true",
-						"__meta_kubernetes_node_label_az":          "eu-central1",
+						"__meta_kubernetes_node_label_az":          "us-east1",
 						"__meta_kubernetes_node_labelpresent_az":   "true",
 						"__meta_kubernetes_node_name":              "foobar",
 					},
@@ -588,13 +656,26 @@ func TestEndpointsDiscoveryWithUpdatedNodeMetadata(t *testing.T) {
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "false",
 					},
+					{
+						"__address__": "6.7.8.9:9002",
+						"__meta_kubernetes_endpoint_address_target_kind": "Node",
+						"__meta_kubernetes_endpoint_address_target_name": "barbaz",
+						"__meta_kubernetes_endpoint_port_name":           "testport",
+						"__meta_kubernetes_endpoint_port_protocol":       "TCP",
+						"__meta_kubernetes_endpoint_ready":               "true",
+						"__meta_kubernetes_node_label_az":                "us-west2",
+						"__meta_kubernetes_node_labelpresent_az":         "true",
+						"__meta_kubernetes_node_name":                    "barbaz",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_namespace":                     "default",
-					"__meta_kubernetes_endpoints_name":                "testendpoints",
-					"__meta_kubernetes_service_label_app_name":        "test",
-					"__meta_kubernetes_service_labelpresent_app_name": "true",
-					"__meta_kubernetes_service_name":                  "testendpoints",
+					"__meta_kubernetes_namespace":                                   "default",
+					"__meta_kubernetes_endpoints_name":                              "testendpoints",
+					"__meta_kubernetes_service_label_app_name":                      "test",
+					"__meta_kubernetes_service_labelpresent_app_name":               "true",
+					"__meta_kubernetes_service_name":                                "testendpoints",
+					"__meta_kubernetes_endpoints_annotation_test_annotation":        "test",
+					"__meta_kubernetes_endpoints_annotationpresent_test_annotation": "true",
 				},
 				Source: "endpoints/default/testendpoints",
 			},
@@ -699,13 +780,23 @@ func TestEndpointsDiscoveryNamespaces(t *testing.T) {
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "false",
 					},
+					{
+						"__address__": "6.7.8.9:9002",
+						"__meta_kubernetes_endpoint_address_target_kind": "Node",
+						"__meta_kubernetes_endpoint_address_target_name": "barbaz",
+						"__meta_kubernetes_endpoint_port_name":           "testport",
+						"__meta_kubernetes_endpoint_port_protocol":       "TCP",
+						"__meta_kubernetes_endpoint_ready":               "true",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_namespace":                "ns1",
-					"__meta_kubernetes_endpoints_name":           "testendpoints",
-					"__meta_kubernetes_service_label_app":        "app1",
-					"__meta_kubernetes_service_labelpresent_app": "true",
-					"__meta_kubernetes_service_name":             "testendpoints",
+					"__meta_kubernetes_namespace":                                   "ns1",
+					"__meta_kubernetes_endpoints_name":                              "testendpoints",
+					"__meta_kubernetes_endpoints_annotation_test_annotation":        "test",
+					"__meta_kubernetes_endpoints_annotationpresent_test_annotation": "true",
+					"__meta_kubernetes_service_label_app":                           "app1",
+					"__meta_kubernetes_service_labelpresent_app":                    "true",
+					"__meta_kubernetes_service_name":                                "testendpoints",
 				},
 				Source: "endpoints/ns1/testendpoints",
 			},
@@ -815,13 +906,66 @@ func TestEndpointsDiscoveryOwnNamespace(t *testing.T) {
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "false",
 					},
+					{
+						"__address__": "6.7.8.9:9002",
+						"__meta_kubernetes_endpoint_address_target_kind": "Node",
+						"__meta_kubernetes_endpoint_address_target_name": "barbaz",
+						"__meta_kubernetes_endpoint_port_name":           "testport",
+						"__meta_kubernetes_endpoint_port_protocol":       "TCP",
+						"__meta_kubernetes_endpoint_ready":               "true",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_namespace":      "own-ns",
-					"__meta_kubernetes_endpoints_name": "testendpoints",
+					"__meta_kubernetes_namespace":                                   "own-ns",
+					"__meta_kubernetes_endpoints_name":                              "testendpoints",
+					"__meta_kubernetes_endpoints_annotation_test_annotation":        "test",
+					"__meta_kubernetes_endpoints_annotationpresent_test_annotation": "true",
 				},
 				Source: "endpoints/own-ns/testendpoints",
 			},
 		},
 	}.Run(t)
 }
+
+func TestEndpointsDiscoveryEmptyPodStatus(t *testing.T) {
+	ep := makeEndpoints()
+	ep.Namespace = "ns"
+
+	pod := &v1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "testpod",
+			Namespace: "ns",
+			UID:       types.UID("deadbeef"),
+		},
+		Spec: v1.PodSpec{
+			NodeName: "testnode",
+			Containers: []v1.Container{
+				{
+					Name:  "p1",
+					Image: "p1:latest",
+					Ports: []v1.ContainerPort{
+						{
+							Name:          "mainport",
+							ContainerPort: 9000,
+							Protocol:      v1.ProtocolTCP,
+						},
+					},
+				},
+			},
+		},
+		Status: v1.PodStatus{},
+	}
+
+	objs := []runtime.Object{
+		ep,
+		pod,
+	}
+
+	n, _ := makeDiscovery(RoleEndpoint, NamespaceDiscovery{IncludeOwnNamespace: true}, objs...)
+
+	k8sDiscoveryTest{
+		discovery:        n,
+		expectedMaxItems: 0,
+		expectedRes:      map[string]*targetgroup.Group{},
+	}.Run(t)
+}

discovery/kubernetes/endpointslice.go

@@ -15,12 +15,14 @@ package kubernetes
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net"
 	"strconv"
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	apiv1 "k8s.io/api/core/v1"
 	v1 "k8s.io/api/discovery/v1"
@@ -32,12 +34,6 @@ import (
 	"github.com/prometheus/prometheus/util/strutil"
 )
 
-var (
-	epslAddCount    = eventCount.WithLabelValues("endpointslice", "add")
-	epslUpdateCount = eventCount.WithLabelValues("endpointslice", "update")
-	epslDeleteCount = eventCount.WithLabelValues("endpointslice", "delete")
-)
-
 // EndpointSlice discovers new endpoint targets.
 type EndpointSlice struct {
 	logger log.Logger
@@ -56,10 +52,19 @@ type EndpointSlice struct {
 }
 
 // NewEndpointSlice returns a new endpointslice discovery.
-func NewEndpointSlice(l log.Logger, eps cache.SharedIndexInformer, svc, pod, node cache.SharedInformer) *EndpointSlice {
+func NewEndpointSlice(l log.Logger, eps cache.SharedIndexInformer, svc, pod, node cache.SharedInformer, eventCount *prometheus.CounterVec) *EndpointSlice {
 	if l == nil {
 		l = log.NewNopLogger()
 	}
+
+	epslAddCount := eventCount.WithLabelValues(RoleEndpointSlice.String(), MetricLabelRoleAdd)
+	epslUpdateCount := eventCount.WithLabelValues(RoleEndpointSlice.String(), MetricLabelRoleUpdate)
+	epslDeleteCount := eventCount.WithLabelValues(RoleEndpointSlice.String(), MetricLabelRoleDelete)
+
+	svcAddCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleAdd)
+	svcUpdateCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleUpdate)
+	svcDeleteCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleDelete)
+
 	e := &EndpointSlice{
 		logger:             l,
 		endpointSliceInf:   eps,
@@ -70,7 +75,7 @@ func NewEndpointSlice(l log.Logger, eps cache.SharedIndexInformer, svc, pod, nod
 		podStore:           pod.GetStore(),
 		nodeInf:            node,
 		withNodeMetadata:   node != nil,
-		queue:              workqueue.NewNamed("endpointSlice"),
+		queue:              workqueue.NewNamed(RoleEndpointSlice.String()),
 	}
 
 	_, err := e.endpointSliceInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
@@ -183,14 +188,14 @@ func (e *EndpointSlice) Run(ctx context.Context, ch chan<- []*targetgroup.Group)
 		cacheSyncs = append(cacheSyncs, e.nodeInf.HasSynced)
 	}
 	if !cache.WaitForCacheSync(ctx.Done(), cacheSyncs...) {
-		if ctx.Err() != context.Canceled {
+		if !errors.Is(ctx.Err(), context.Canceled) {
 			level.Error(e.logger).Log("msg", "endpointslice informer unable to sync cache")
 		}
 		return
 	}
 
 	go func() {
-		for e.process(ctx, ch) { // nolint:revive
+		for e.process(ctx, ch) {
 		}
 	}()
 
@@ -252,7 +257,6 @@ func endpointSliceSourceFromNamespaceAndName(namespace, name string) string {
 }
 
 const (
-	endpointSliceNameLabel                          = metaLabelPrefix + "endpointslice_name"
 	endpointSliceAddressTypeLabel                   = metaLabelPrefix + "endpointslice_address_type"
 	endpointSlicePortNameLabel                      = metaLabelPrefix + "endpointslice_port_name"
 	endpointSlicePortProtocolLabel                  = metaLabelPrefix + "endpointslice_port_protocol"
@@ -274,9 +278,11 @@ func (e *EndpointSlice) buildEndpointSlice(eps endpointSliceAdaptor) *targetgrou
 	}
 	tg.Labels = model.LabelSet{
 		namespaceLabel:                lv(eps.namespace()),
-		endpointSliceNameLabel:        lv(eps.name()),
 		endpointSliceAddressTypeLabel: lv(eps.addressType()),
 	}
+
+	addObjectMetaLabels(tg.Labels, eps.getObjectMeta(), RoleEndpointSlice)
+
 	e.addServiceLabels(eps, tg)
 
 	type podEntry struct {
@@ -339,7 +345,11 @@ func (e *EndpointSlice) buildEndpointSlice(eps endpointSliceAdaptor) *targetgrou
 		}
 
 		if e.withNodeMetadata {
-			target = addNodeLabels(target, e.nodeInf, e.logger, ep.nodename())
+			if ep.targetRef() != nil && ep.targetRef().Kind == "Node" {
+				target = addNodeLabels(target, e.nodeInf, e.logger, &ep.targetRef().Name)
+			} else {
+				target = addNodeLabels(target, e.nodeInf, e.logger, ep.nodename())
+			}
 		}
 
 		pod := e.resolvePodRef(ep.targetRef())
@@ -412,18 +422,21 @@ func (e *EndpointSlice) buildEndpointSlice(eps endpointSliceAdaptor) *targetgrou
 					continue
 				}
 
-				a := net.JoinHostPort(pe.pod.Status.PodIP, strconv.FormatUint(uint64(cport.ContainerPort), 10))
-				ports := strconv.FormatUint(uint64(cport.ContainerPort), 10)
+				// PodIP can be empty when a pod is starting or has been evicted.
+				if len(pe.pod.Status.PodIP) != 0 {
+					a := net.JoinHostPort(pe.pod.Status.PodIP, strconv.FormatUint(uint64(cport.ContainerPort), 10))
+					ports := strconv.FormatUint(uint64(cport.ContainerPort), 10)
 
-				target := model.LabelSet{
-					model.AddressLabel:            lv(a),
-					podContainerNameLabel:         lv(c.Name),
-					podContainerImageLabel:        lv(c.Image),
-					podContainerPortNameLabel:     lv(cport.Name),
-					podContainerPortNumberLabel:   lv(ports),
-					podContainerPortProtocolLabel: lv(string(cport.Protocol)),
+					target := model.LabelSet{
+						model.AddressLabel:            lv(a),
+						podContainerNameLabel:         lv(c.Name),
+						podContainerImageLabel:        lv(c.Image),
+						podContainerPortNameLabel:     lv(cport.Name),
+						podContainerPortNumberLabel:   lv(ports),
+						podContainerPortProtocolLabel: lv(string(cport.Protocol)),
+					}
+					tg.Targets = append(tg.Targets, target.Merge(podLabels(pe.pod)))
 				}
-				tg.Targets = append(tg.Targets, target.Merge(podLabels(pe.pod)))
 			}
 		}
 	}

discovery/kubernetes/endpointslice_adaptor.go

@@ -17,11 +17,13 @@ import (
 	corev1 "k8s.io/api/core/v1"
 	v1 "k8s.io/api/discovery/v1"
 	"k8s.io/api/discovery/v1beta1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
-// endpointSliceAdaptor is an adaptor for the different EndpointSlice versions
+// endpointSliceAdaptor is an adaptor for the different EndpointSlice versions.
 type endpointSliceAdaptor interface {
 	get() interface{}
+	getObjectMeta() metav1.ObjectMeta
 	name() string
 	namespace() string
 	addressType() string
@@ -53,7 +55,7 @@ type endpointSliceEndpointConditionsAdaptor interface {
 	terminating() *bool
 }
 
-// Adaptor for k8s.io/api/discovery/v1
+// Adaptor for k8s.io/api/discovery/v1.
 type endpointSliceAdaptorV1 struct {
 	endpointSlice *v1.EndpointSlice
 }
@@ -66,6 +68,10 @@ func (e *endpointSliceAdaptorV1) get() interface{} {
 	return e.endpointSlice
 }
 
+func (e *endpointSliceAdaptorV1) getObjectMeta() metav1.ObjectMeta {
+	return e.endpointSlice.ObjectMeta
+}
+
 func (e *endpointSliceAdaptorV1) name() string {
 	return e.endpointSlice.ObjectMeta.Name
 }
@@ -102,7 +108,7 @@ func (e *endpointSliceAdaptorV1) labelServiceName() string {
 	return v1.LabelServiceName
 }
 
-// Adaptor for k8s.io/api/discovery/v1beta1
+// Adaptor for k8s.io/api/discovery/v1beta1.
 type endpointSliceAdaptorV1Beta1 struct {
 	endpointSlice *v1beta1.EndpointSlice
 }
@@ -115,6 +121,10 @@ func (e *endpointSliceAdaptorV1Beta1) get() interface{} {
 	return e.endpointSlice
 }
 
+func (e *endpointSliceAdaptorV1Beta1) getObjectMeta() metav1.ObjectMeta {
+	return e.endpointSlice.ObjectMeta
+}
+
 func (e *endpointSliceAdaptorV1Beta1) name() string {
 	return e.endpointSlice.Name
 }

discovery/kubernetes/endpointslice_adaptor_test.go

@@ -29,7 +29,7 @@ func Test_EndpointSliceAdaptor_v1(t *testing.T) {
 	require.Equal(t, endpointSlice.ObjectMeta.Namespace, adaptor.namespace())
 	require.Equal(t, endpointSlice.AddressType, v1.AddressType(adaptor.addressType()))
 	require.Equal(t, endpointSlice.Labels, adaptor.labels())
-	require.Equal(t, endpointSlice.Labels[v1.LabelServiceName], "testendpoints")
+	require.Equal(t, "testendpoints", endpointSlice.Labels[v1.LabelServiceName])
 
 	for i, endpointAdaptor := range adaptor.endpoints() {
 		require.Equal(t, endpointSlice.Endpoints[i].Addresses, endpointAdaptor.addresses())
@@ -57,7 +57,7 @@ func Test_EndpointSliceAdaptor_v1beta1(t *testing.T) {
 	require.Equal(t, endpointSlice.ObjectMeta.Namespace, adaptor.namespace())
 	require.Equal(t, endpointSlice.AddressType, v1beta1.AddressType(adaptor.addressType()))
 	require.Equal(t, endpointSlice.Labels, adaptor.labels())
-	require.Equal(t, endpointSlice.Labels[v1beta1.LabelServiceName], "testendpoints")
+	require.Equal(t, "testendpoints", endpointSlice.Labels[v1beta1.LabelServiceName])
 
 	for i, endpointAdaptor := range adaptor.endpoints() {
 		require.Equal(t, endpointSlice.Endpoints[i].Addresses, endpointAdaptor.addresses())

discovery/kubernetes/endpointslice_test.go

@@ -52,6 +52,9 @@ func makeEndpointSliceV1() *v1.EndpointSlice {
 			Labels: map[string]string{
 				v1.LabelServiceName: "testendpoints",
 			},
+			Annotations: map[string]string{
+				"test.annotation": "test",
+			},
 		},
 		AddressType: v1.AddressTypeIPv4,
 		Ports: []v1.EndpointPort{
@@ -90,6 +93,17 @@ func makeEndpointSliceV1() *v1.EndpointSlice {
 					Serving:     boolptr(true),
 					Terminating: boolptr(true),
 				},
+			}, {
+				Addresses: []string{"4.5.6.7"},
+				Conditions: v1.EndpointConditions{
+					Ready:       boolptr(true),
+					Serving:     boolptr(true),
+					Terminating: boolptr(false),
+				},
+				TargetRef: &corev1.ObjectReference{
+					Kind: "Node",
+					Name: "barbaz",
+				},
 			},
 		},
 	}
@@ -103,6 +117,9 @@ func makeEndpointSliceV1beta1() *v1beta1.EndpointSlice {
 			Labels: map[string]string{
 				v1beta1.LabelServiceName: "testendpoints",
 			},
+			Annotations: map[string]string{
+				"test.annotation": "test",
+			},
 		},
 		AddressType: v1beta1.AddressTypeIPv4,
 		Ports: []v1beta1.EndpointPort{
@@ -130,6 +147,17 @@ func makeEndpointSliceV1beta1() *v1beta1.EndpointSlice {
 					Serving:     boolptr(true),
 					Terminating: boolptr(true),
 				},
+			}, {
+				Addresses: []string{"4.5.6.7"},
+				Conditions: v1beta1.EndpointConditions{
+					Ready:       boolptr(true),
+					Serving:     boolptr(true),
+					Terminating: boolptr(false),
+				},
+				TargetRef: &corev1.ObjectReference{
+					Kind: "Node",
+					Name: "barbaz",
+				},
 			},
 		},
 	}
@@ -183,11 +211,27 @@ func TestEndpointSliceDiscoveryBeforeRun(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_name":                       "testport",
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type": "IPv4",
-					"__meta_kubernetes_namespace":                  "default",
-					"__meta_kubernetes_endpointslice_name":         "testendpoints",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_namespace":                                             "default",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
 				},
 				Source: "endpointslice/default/testendpoints",
 			},
@@ -233,11 +277,26 @@ func TestEndpointSliceDiscoveryBeforeRunV1beta1(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_name":                       "testport",
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type": "IPv4",
-					"__meta_kubernetes_namespace":                  "default",
-					"__meta_kubernetes_endpointslice_name":         "testendpoints",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_namespace":                                             "default",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
 				},
 				Source: "endpointslice/default/testendpoints",
 			},
@@ -419,11 +478,27 @@ func TestEndpointSliceDiscoveryDelete(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_name":                       "testport",
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+					},
 				},
 				Labels: map[model.LabelName]model.LabelValue{
-					"__meta_kubernetes_endpointslice_address_type": "IPv4",
-					"__meta_kubernetes_endpointslice_name":         "testendpoints",
-					"__meta_kubernetes_namespace":                  "default",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
+					"__meta_kubernetes_namespace":                                             "default",
 				},
 			},
 		},
@@ -503,11 +578,27 @@ func TestEndpointSliceDiscoveryUpdate(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_name":                       "testport",
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type": "IPv4",
-					"__meta_kubernetes_endpointslice_name":         "testendpoints",
-					"__meta_kubernetes_namespace":                  "default",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
+					"__meta_kubernetes_namespace":                                             "default",
 				},
 			},
 		},
@@ -576,11 +667,27 @@ func TestEndpointSliceDiscoveryEmptyEndpoints(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_name":                       "testport",
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type": "IPv4",
-					"__meta_kubernetes_endpointslice_name":         "testendpoints",
-					"__meta_kubernetes_namespace":                  "default",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
+					"__meta_kubernetes_namespace":                                             "default",
 				},
 				Source: "endpointslice/default/testendpoints",
 			},
@@ -644,14 +751,30 @@ func TestEndpointSliceDiscoveryWithService(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_name":                       "testport",
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type":    "IPv4",
-					"__meta_kubernetes_endpointslice_name":            "testendpoints",
-					"__meta_kubernetes_namespace":                     "default",
-					"__meta_kubernetes_service_label_app_name":        "test",
-					"__meta_kubernetes_service_labelpresent_app_name": "true",
-					"__meta_kubernetes_service_name":                  "testendpoints",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
+					"__meta_kubernetes_namespace":                                             "default",
+					"__meta_kubernetes_service_label_app_name":                                "test",
+					"__meta_kubernetes_service_labelpresent_app_name":                         "true",
+					"__meta_kubernetes_service_name":                                          "testendpoints",
 				},
 				Source: "endpointslice/default/testendpoints",
 			},
@@ -728,16 +851,32 @@ func TestEndpointSliceDiscoveryWithServiceUpdate(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type":     "IPv4",
-					"__meta_kubernetes_endpointslice_name":             "testendpoints",
-					"__meta_kubernetes_namespace":                      "default",
-					"__meta_kubernetes_service_label_app_name":         "svc",
-					"__meta_kubernetes_service_label_component":        "testing",
-					"__meta_kubernetes_service_labelpresent_app_name":  "true",
-					"__meta_kubernetes_service_labelpresent_component": "true",
-					"__meta_kubernetes_service_name":                   "testendpoints",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
+					"__meta_kubernetes_namespace":                                             "default",
+					"__meta_kubernetes_service_label_app_name":                                "svc",
+					"__meta_kubernetes_service_label_component":                               "testing",
+					"__meta_kubernetes_service_labelpresent_app_name":                         "true",
+					"__meta_kubernetes_service_labelpresent_component":                        "true",
+					"__meta_kubernetes_service_name":                                          "testendpoints",
 				},
 				Source: "endpointslice/default/testendpoints",
 			},
@@ -747,7 +886,8 @@ func TestEndpointSliceDiscoveryWithServiceUpdate(t *testing.T) {
 
 func TestEndpointsSlicesDiscoveryWithNodeMetadata(t *testing.T) {
 	metadataConfig := AttachMetadataConfig{Node: true}
-	nodeLabels := map[string]string{"az": "us-east1"}
+	nodeLabels1 := map[string]string{"az": "us-east1"}
+	nodeLabels2 := map[string]string{"az": "us-west2"}
 	svc := &corev1.Service{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      "testendpoints",
@@ -757,7 +897,7 @@ func TestEndpointsSlicesDiscoveryWithNodeMetadata(t *testing.T) {
 			},
 		},
 	}
-	objs := []runtime.Object{makeEndpointSliceV1(), makeNode("foobar", "", "", nodeLabels, nil), svc}
+	objs := []runtime.Object{makeEndpointSliceV1(), makeNode("foobar", "", "", nodeLabels1, nil), makeNode("barbaz", "", "", nodeLabels2, nil), svc}
 	n, _ := makeDiscoveryWithMetadata(RoleEndpointSlice, NamespaceDiscovery{}, metadataConfig, objs...)
 
 	k8sDiscoveryTest{
@@ -804,14 +944,33 @@ func TestEndpointsSlicesDiscoveryWithNodeMetadata(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_name":                       "testport",
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+						"__meta_kubernetes_node_label_az":                                 "us-west2",
+						"__meta_kubernetes_node_labelpresent_az":                          "true",
+						"__meta_kubernetes_node_name":                                     "barbaz",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type":    "IPv4",
-					"__meta_kubernetes_endpointslice_name":            "testendpoints",
-					"__meta_kubernetes_namespace":                     "default",
-					"__meta_kubernetes_service_label_app_name":        "test",
-					"__meta_kubernetes_service_labelpresent_app_name": "true",
-					"__meta_kubernetes_service_name":                  "testendpoints",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
+					"__meta_kubernetes_namespace":                                             "default",
+					"__meta_kubernetes_service_label_app_name":                                "test",
+					"__meta_kubernetes_service_labelpresent_app_name":                         "true",
+					"__meta_kubernetes_service_name":                                          "testendpoints",
 				},
 				Source: "endpointslice/default/testendpoints",
 			},
@@ -821,7 +980,8 @@ func TestEndpointsSlicesDiscoveryWithNodeMetadata(t *testing.T) {
 
 func TestEndpointsSlicesDiscoveryWithUpdatedNodeMetadata(t *testing.T) {
 	metadataConfig := AttachMetadataConfig{Node: true}
-	nodeLabels := map[string]string{"az": "us-east1"}
+	nodeLabels1 := map[string]string{"az": "us-east1"}
+	nodeLabels2 := map[string]string{"az": "us-west2"}
 	svc := &corev1.Service{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      "testendpoints",
@@ -831,16 +991,17 @@ func TestEndpointsSlicesDiscoveryWithUpdatedNodeMetadata(t *testing.T) {
 			},
 		},
 	}
-	node := makeNode("foobar", "", "", nodeLabels, nil)
-	objs := []runtime.Object{makeEndpointSliceV1(), node, svc}
+	node1 := makeNode("foobar", "", "", nodeLabels1, nil)
+	node2 := makeNode("barbaz", "", "", nodeLabels2, nil)
+	objs := []runtime.Object{makeEndpointSliceV1(), node1, node2, svc}
 	n, c := makeDiscoveryWithMetadata(RoleEndpointSlice, NamespaceDiscovery{}, metadataConfig, objs...)
 
 	k8sDiscoveryTest{
 		discovery:        n,
 		expectedMaxItems: 2,
 		afterStart: func() {
-			node.Labels["az"] = "us-central1"
-			c.CoreV1().Nodes().Update(context.Background(), node, metav1.UpdateOptions{})
+			node1.Labels["az"] = "us-central1"
+			c.CoreV1().Nodes().Update(context.Background(), node1, metav1.UpdateOptions{})
 		},
 		expectedRes: map[string]*targetgroup.Group{
 			"endpointslice/default/testendpoints": {
@@ -859,7 +1020,7 @@ func TestEndpointsSlicesDiscoveryWithUpdatedNodeMetadata(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_app_protocol":                  "http",
 						"__meta_kubernetes_endpointslice_port_name":                          "testport",
 						"__meta_kubernetes_endpointslice_port_protocol":                      "TCP",
-						"__meta_kubernetes_node_label_az":                                    "us-central1",
+						"__meta_kubernetes_node_label_az":                                    "us-east1",
 						"__meta_kubernetes_node_labelpresent_az":                             "true",
 						"__meta_kubernetes_node_name":                                        "foobar",
 					},
@@ -883,14 +1044,33 @@ func TestEndpointsSlicesDiscoveryWithUpdatedNodeMetadata(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_name":                       "testport",
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+						"__meta_kubernetes_node_label_az":                                 "us-west2",
+						"__meta_kubernetes_node_labelpresent_az":                          "true",
+						"__meta_kubernetes_node_name":                                     "barbaz",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type":    "IPv4",
-					"__meta_kubernetes_endpointslice_name":            "testendpoints",
-					"__meta_kubernetes_namespace":                     "default",
-					"__meta_kubernetes_service_label_app_name":        "test",
-					"__meta_kubernetes_service_labelpresent_app_name": "true",
-					"__meta_kubernetes_service_name":                  "testendpoints",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
+					"__meta_kubernetes_namespace":                                             "default",
+					"__meta_kubernetes_service_label_app_name":                                "test",
+					"__meta_kubernetes_service_labelpresent_app_name":                         "true",
+					"__meta_kubernetes_service_name":                                          "testendpoints",
 				},
 				Source: "endpointslice/default/testendpoints",
 			},
@@ -1007,14 +1187,30 @@ func TestEndpointSliceDiscoveryNamespaces(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type": "IPv4",
-					"__meta_kubernetes_endpointslice_name":         "testendpoints",
-					"__meta_kubernetes_namespace":                  "ns1",
-					"__meta_kubernetes_service_label_app":          "app1",
-					"__meta_kubernetes_service_labelpresent_app":   "true",
-					"__meta_kubernetes_service_name":               "testendpoints",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
+					"__meta_kubernetes_namespace":                                             "ns1",
+					"__meta_kubernetes_service_label_app":                                     "app1",
+					"__meta_kubernetes_service_labelpresent_app":                              "true",
+					"__meta_kubernetes_service_name":                                          "testendpoints",
 				},
 				Source: "endpointslice/ns1/testendpoints",
 			},
@@ -1139,14 +1335,73 @@ func TestEndpointSliceDiscoveryOwnNamespace(t *testing.T) {
 						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
 						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
 					},
+					{
+						"__address__": "4.5.6.7:9000",
+						"__meta_kubernetes_endpointslice_address_target_kind":             "Node",
+						"__meta_kubernetes_endpointslice_address_target_name":             "barbaz",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_ready":       "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_serving":     "true",
+						"__meta_kubernetes_endpointslice_endpoint_conditions_terminating": "false",
+						"__meta_kubernetes_endpointslice_port":                            "9000",
+						"__meta_kubernetes_endpointslice_port_app_protocol":               "http",
+						"__meta_kubernetes_endpointslice_port_name":                       "testport",
+						"__meta_kubernetes_endpointslice_port_protocol":                   "TCP",
+					},
 				},
 				Labels: model.LabelSet{
-					"__meta_kubernetes_endpointslice_address_type": "IPv4",
-					"__meta_kubernetes_endpointslice_name":         "testendpoints",
-					"__meta_kubernetes_namespace":                  "own-ns",
+					"__meta_kubernetes_endpointslice_address_type":                            "IPv4",
+					"__meta_kubernetes_endpointslice_name":                                    "testendpoints",
+					"__meta_kubernetes_namespace":                                             "own-ns",
+					"__meta_kubernetes_endpointslice_label_kubernetes_io_service_name":        "testendpoints",
+					"__meta_kubernetes_endpointslice_labelpresent_kubernetes_io_service_name": "true",
+					"__meta_kubernetes_endpointslice_annotation_test_annotation":              "test",
+					"__meta_kubernetes_endpointslice_annotationpresent_test_annotation":       "true",
 				},
 				Source: "endpointslice/own-ns/testendpoints",
 			},
 		},
 	}.Run(t)
 }
+
+func TestEndpointSliceDiscoveryEmptyPodStatus(t *testing.T) {
+	ep := makeEndpointSliceV1()
+	ep.Namespace = "ns"
+
+	pod := &corev1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "testpod",
+			Namespace: "ns",
+			UID:       types.UID("deadbeef"),
+		},
+		Spec: corev1.PodSpec{
+			NodeName: "testnode",
+			Containers: []corev1.Container{
+				{
+					Name:  "p1",
+					Image: "p1:latest",
+					Ports: []corev1.ContainerPort{
+						{
+							Name:          "mainport",
+							ContainerPort: 9000,
+							Protocol:      corev1.ProtocolTCP,
+						},
+					},
+				},
+			},
+		},
+		Status: corev1.PodStatus{},
+	}
+
+	objs := []runtime.Object{
+		ep,
+		pod,
+	}
+
+	n, _ := makeDiscovery(RoleEndpoint, NamespaceDiscovery{IncludeOwnNamespace: true}, objs...)
+
+	k8sDiscoveryTest{
+		discovery:        n,
+		expectedMaxItems: 0,
+		expectedRes:      map[string]*targetgroup.Group{},
+	}.Run(t)
+}

discovery/kubernetes/ingress.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	v1 "k8s.io/api/networking/v1"
 	"k8s.io/api/networking/v1beta1"
@@ -28,13 +29,6 @@ import (
 	"k8s.io/client-go/util/workqueue"
 
 	"github.com/prometheus/prometheus/discovery/targetgroup"
-	"github.com/prometheus/prometheus/util/strutil"
-)
-
-var (
-	ingressAddCount    = eventCount.WithLabelValues("ingress", "add")
-	ingressUpdateCount = eventCount.WithLabelValues("ingress", "update")
-	ingressDeleteCount = eventCount.WithLabelValues("ingress", "delete")
 )
 
 // Ingress implements discovery of Kubernetes ingress.
@@ -46,8 +40,18 @@ type Ingress struct {
 }
 
 // NewIngress returns a new ingress discovery.
-func NewIngress(l log.Logger, inf cache.SharedInformer) *Ingress {
-	s := &Ingress{logger: l, informer: inf, store: inf.GetStore(), queue: workqueue.NewNamed("ingress")}
+func NewIngress(l log.Logger, inf cache.SharedInformer, eventCount *prometheus.CounterVec) *Ingress {
+	ingressAddCount := eventCount.WithLabelValues(RoleIngress.String(), MetricLabelRoleAdd)
+	ingressUpdateCount := eventCount.WithLabelValues(RoleIngress.String(), MetricLabelRoleUpdate)
+	ingressDeleteCount := eventCount.WithLabelValues(RoleIngress.String(), MetricLabelRoleDelete)
+
+	s := &Ingress{
+		logger:   l,
+		informer: inf,
+		store:    inf.GetStore(),
+		queue:    workqueue.NewNamed(RoleIngress.String()),
+	}
+
 	_, err := s.informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
 		AddFunc: func(o interface{}) {
 			ingressAddCount.Inc()
@@ -89,7 +93,7 @@ func (i *Ingress) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	}
 
 	go func() {
-		for i.process(ctx, ch) { // nolint:revive
+		for i.process(ctx, ch) {
 		}
 	}()
 
@@ -143,37 +147,22 @@ func ingressSourceFromNamespaceAndName(namespace, name string) string {
 }
 
 const (
-	ingressNameLabel               = metaLabelPrefix + "ingress_name"
-	ingressLabelPrefix             = metaLabelPrefix + "ingress_label_"
-	ingressLabelPresentPrefix      = metaLabelPrefix + "ingress_labelpresent_"
-	ingressAnnotationPrefix        = metaLabelPrefix + "ingress_annotation_"
-	ingressAnnotationPresentPrefix = metaLabelPrefix + "ingress_annotationpresent_"
-	ingressSchemeLabel             = metaLabelPrefix + "ingress_scheme"
-	ingressHostLabel               = metaLabelPrefix + "ingress_host"
-	ingressPathLabel               = metaLabelPrefix + "ingress_path"
-	ingressClassNameLabel          = metaLabelPrefix + "ingress_class_name"
+	ingressSchemeLabel    = metaLabelPrefix + "ingress_scheme"
+	ingressHostLabel      = metaLabelPrefix + "ingress_host"
+	ingressPathLabel      = metaLabelPrefix + "ingress_path"
+	ingressClassNameLabel = metaLabelPrefix + "ingress_class_name"
 )
 
 func ingressLabels(ingress ingressAdaptor) model.LabelSet {
 	// Each label and annotation will create two key-value pairs in the map.
-	ls := make(model.LabelSet, 2*(len(ingress.labels())+len(ingress.annotations()))+2)
-	ls[ingressNameLabel] = lv(ingress.name())
+	ls := make(model.LabelSet)
 	ls[namespaceLabel] = lv(ingress.namespace())
 	if cls := ingress.ingressClassName(); cls != nil {
 		ls[ingressClassNameLabel] = lv(*cls)
 	}
 
-	for k, v := range ingress.labels() {
-		ln := strutil.SanitizeLabelName(k)
-		ls[model.LabelName(ingressLabelPrefix+ln)] = lv(v)
-		ls[model.LabelName(ingressLabelPresentPrefix+ln)] = presentValue
-	}
+	addObjectMetaLabels(ls, ingress.getObjectMeta(), RoleIngress)
 
-	for k, v := range ingress.annotations() {
-		ln := strutil.SanitizeLabelName(k)
-		ls[model.LabelName(ingressAnnotationPrefix+ln)] = lv(v)
-		ls[model.LabelName(ingressAnnotationPresentPrefix+ln)] = presentValue
-	}
 	return ls
 }
 

discovery/kubernetes/ingress_adaptor.go

@@ -16,10 +16,12 @@ package kubernetes
 import (
 	v1 "k8s.io/api/networking/v1"
 	"k8s.io/api/networking/v1beta1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
-// ingressAdaptor is an adaptor for the different Ingress versions
+// ingressAdaptor is an adaptor for the different Ingress versions.
 type ingressAdaptor interface {
+	getObjectMeta() metav1.ObjectMeta
 	name() string
 	namespace() string
 	labels() map[string]string
@@ -34,7 +36,7 @@ type ingressRuleAdaptor interface {
 	host() string
 }
 
-// Adaptor for networking.k8s.io/v1
+// Adaptor for networking.k8s.io/v1.
 type ingressAdaptorV1 struct {
 	ingress *v1.Ingress
 }
@@ -43,11 +45,12 @@ func newIngressAdaptorFromV1(ingress *v1.Ingress) ingressAdaptor {
 	return &ingressAdaptorV1{ingress: ingress}
 }
 
-func (i *ingressAdaptorV1) name() string                   { return i.ingress.Name }
-func (i *ingressAdaptorV1) namespace() string              { return i.ingress.Namespace }
-func (i *ingressAdaptorV1) labels() map[string]string      { return i.ingress.Labels }
-func (i *ingressAdaptorV1) annotations() map[string]string { return i.ingress.Annotations }
-func (i *ingressAdaptorV1) ingressClassName() *string      { return i.ingress.Spec.IngressClassName }
+func (i *ingressAdaptorV1) getObjectMeta() metav1.ObjectMeta { return i.ingress.ObjectMeta }
+func (i *ingressAdaptorV1) name() string                     { return i.ingress.Name }
+func (i *ingressAdaptorV1) namespace() string                { return i.ingress.Namespace }
+func (i *ingressAdaptorV1) labels() map[string]string        { return i.ingress.Labels }
+func (i *ingressAdaptorV1) annotations() map[string]string   { return i.ingress.Annotations }
+func (i *ingressAdaptorV1) ingressClassName() *string        { return i.ingress.Spec.IngressClassName }
 
 func (i *ingressAdaptorV1) tlsHosts() []string {
 	var hosts []string
@@ -87,7 +90,7 @@ func (i *ingressRuleAdaptorV1) paths() []string {
 
 func (i *ingressRuleAdaptorV1) host() string { return i.rule.Host }
 
-// Adaptor for networking.k8s.io/v1beta1
+// Adaptor for networking.k8s.io/v1beta1.
 type ingressAdaptorV1Beta1 struct {
 	ingress *v1beta1.Ingress
 }
@@ -95,12 +98,12 @@ type ingressAdaptorV1Beta1 struct {
 func newIngressAdaptorFromV1beta1(ingress *v1beta1.Ingress) ingressAdaptor {
 	return &ingressAdaptorV1Beta1{ingress: ingress}
 }
-
-func (i *ingressAdaptorV1Beta1) name() string                   { return i.ingress.Name }
-func (i *ingressAdaptorV1Beta1) namespace() string              { return i.ingress.Namespace }
-func (i *ingressAdaptorV1Beta1) labels() map[string]string      { return i.ingress.Labels }
-func (i *ingressAdaptorV1Beta1) annotations() map[string]string { return i.ingress.Annotations }
-func (i *ingressAdaptorV1Beta1) ingressClassName() *string      { return i.ingress.Spec.IngressClassName }
+func (i *ingressAdaptorV1Beta1) getObjectMeta() metav1.ObjectMeta { return i.ingress.ObjectMeta }
+func (i *ingressAdaptorV1Beta1) name() string                     { return i.ingress.Name }
+func (i *ingressAdaptorV1Beta1) namespace() string                { return i.ingress.Namespace }
+func (i *ingressAdaptorV1Beta1) labels() map[string]string        { return i.ingress.Labels }
+func (i *ingressAdaptorV1Beta1) annotations() map[string]string   { return i.ingress.Annotations }
+func (i *ingressAdaptorV1Beta1) ingressClassName() *string        { return i.ingress.Spec.IngressClassName }
 
 func (i *ingressAdaptorV1Beta1) tlsHosts() []string {
 	var hosts []string

discovery/kubernetes/kubernetes.go

@@ -23,6 +23,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/prometheus/prometheus/util/strutil"
+
 	disv1beta1 "k8s.io/api/discovery/v1beta1"
 
 	"github.com/go-kit/log"
@@ -56,25 +58,15 @@ import (
 const (
 	// metaLabelPrefix is the meta prefix used for all meta labels.
 	// in this discovery.
-	metaLabelPrefix  = model.MetaLabelPrefix + "kubernetes_"
-	namespaceLabel   = metaLabelPrefix + "namespace"
-	metricsNamespace = "prometheus_sd_kubernetes"
-	presentValue     = model.LabelValue("true")
+	metaLabelPrefix = model.MetaLabelPrefix + "kubernetes_"
+	namespaceLabel  = metaLabelPrefix + "namespace"
+	presentValue    = model.LabelValue("true")
 )
 
 var (
-	// Http header
+	// Http header.
 	userAgent = fmt.Sprintf("Prometheus/%s", version.Version)
-	// Custom events metric
-	eventCount = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Namespace: metricsNamespace,
-			Name:      "events_total",
-			Help:      "The number of Kubernetes events handled.",
-		},
-		[]string{"role", "event"},
-	)
-	// DefaultSDConfig is the default Kubernetes SD configuration
+	// DefaultSDConfig is the default Kubernetes SD configuration.
 	DefaultSDConfig = SDConfig{
 		HTTPClientConfig: config.DefaultHTTPClientConfig,
 	}
@@ -82,15 +74,6 @@ var (
 
 func init() {
 	discovery.RegisterConfig(&SDConfig{})
-	prometheus.MustRegister(eventCount)
-	// Initialize metric vectors.
-	for _, role := range []string{"endpointslice", "endpoints", "node", "pod", "service", "ingress"} {
-		for _, evt := range []string{"add", "delete", "update"} {
-			eventCount.WithLabelValues(role, evt)
-		}
-	}
-	(&clientGoRequestMetricAdapter{}).Register(prometheus.DefaultRegisterer)
-	(&clientGoWorkqueueMetricsProvider{}).Register(prometheus.DefaultRegisterer)
 }
 
 // Role is role of the service in Kubernetes.
@@ -119,6 +102,16 @@ func (c *Role) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	}
 }
 
+func (c Role) String() string {
+	return string(c)
+}
+
+const (
+	MetricLabelRoleAdd    = "add"
+	MetricLabelRoleDelete = "delete"
+	MetricLabelRoleUpdate = "update"
+)
+
 // SDConfig is the configuration for Kubernetes service discovery.
 type SDConfig struct {
 	APIServer          config.URL              `yaml:"api_server,omitempty"`
@@ -135,7 +128,7 @@ func (*SDConfig) Name() string { return "kubernetes" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return New(opts.Logger, c)
+	return New(opts.Logger, opts.Registerer, c)
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -272,6 +265,8 @@ type Discovery struct {
 	selectors          roleSelector
 	ownNamespace       string
 	attachMetadata     AttachMetadataConfig
+	eventCount         *prometheus.CounterVec
+	metricRegisterer   discovery.MetricRegisterer
 }
 
 func (d *Discovery) getNamespaces() []string {
@@ -290,7 +285,7 @@ func (d *Discovery) getNamespaces() []string {
 }
 
 // New creates a new Kubernetes discovery for the given role.
-func New(l log.Logger, conf *SDConfig) (*Discovery, error) {
+func New(l log.Logger, reg prometheus.Registerer, conf *SDConfig) (*Discovery, error) {
 	if l == nil {
 		l = log.NewNopLogger()
 	}
@@ -344,7 +339,7 @@ func New(l log.Logger, conf *SDConfig) (*Discovery, error) {
 		return nil, err
 	}
 
-	return &Discovery{
+	d := &Discovery{
 		client:             c,
 		logger:             l,
 		role:               conf.Role,
@@ -353,7 +348,37 @@ func New(l log.Logger, conf *SDConfig) (*Discovery, error) {
 		selectors:          mapSelector(conf.Selectors),
 		ownNamespace:       ownNamespace,
 		attachMetadata:     conf.AttachMetadata,
-	}, nil
+		eventCount: prometheus.NewCounterVec(
+			prometheus.CounterOpts{
+				Namespace: discovery.KubernetesMetricsNamespace,
+				Name:      "events_total",
+				Help:      "The number of Kubernetes events handled.",
+			},
+			[]string{"role", "event"},
+		),
+	}
+
+	d.metricRegisterer = discovery.NewMetricRegisterer(reg, []prometheus.Collector{d.eventCount})
+
+	// Initialize metric vectors.
+	for _, role := range []string{
+		RoleEndpointSlice.String(),
+		RoleEndpoint.String(),
+		RoleNode.String(),
+		RolePod.String(),
+		RoleService.String(),
+		RoleIngress.String(),
+	} {
+		for _, evt := range []string{
+			MetricLabelRoleAdd,
+			MetricLabelRoleDelete,
+			MetricLabelRoleUpdate,
+		} {
+			d.eventCount.WithLabelValues(role, evt)
+		}
+	}
+
+	return d, nil
 }
 
 func mapSelector(rawSelector []SelectorConfig) roleSelector {
@@ -389,6 +414,14 @@ const resyncDisabled = 0
 // Run implements the discoverer interface.
 func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	d.Lock()
+
+	err := d.metricRegisterer.RegisterMetrics()
+	if err != nil {
+		level.Error(d.logger).Log("msg", "Unable to register metrics", "err", err.Error())
+		return
+	}
+	defer d.metricRegisterer.UnregisterMetrics()
+
 	namespaces := d.getNamespaces()
 
 	switch d.role {
@@ -480,6 +513,7 @@ func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 				cache.NewSharedInformer(slw, &apiv1.Service{}, resyncDisabled),
 				cache.NewSharedInformer(plw, &apiv1.Pod{}, resyncDisabled),
 				nodeInf,
+				d.eventCount,
 			)
 			d.discoverers = append(d.discoverers, eps)
 			go eps.endpointSliceInf.Run(ctx.Done())
@@ -539,6 +573,7 @@ func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 				cache.NewSharedInformer(slw, &apiv1.Service{}, resyncDisabled),
 				cache.NewSharedInformer(plw, &apiv1.Pod{}, resyncDisabled),
 				nodeInf,
+				d.eventCount,
 			)
 			d.discoverers = append(d.discoverers, eps)
 			go eps.endpointsInf.Run(ctx.Done())
@@ -570,6 +605,7 @@ func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 				log.With(d.logger, "role", "pod"),
 				d.newPodsByNodeInformer(plw),
 				nodeInformer,
+				d.eventCount,
 			)
 			d.discoverers = append(d.discoverers, pod)
 			go pod.podInf.Run(ctx.Done())
@@ -592,6 +628,7 @@ func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 			svc := NewService(
 				log.With(d.logger, "role", "service"),
 				cache.NewSharedInformer(slw, &apiv1.Service{}, resyncDisabled),
+				d.eventCount,
 			)
 			d.discoverers = append(d.discoverers, svc)
 			go svc.informer.Run(ctx.Done())
@@ -649,13 +686,14 @@ func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 			ingress := NewIngress(
 				log.With(d.logger, "role", "ingress"),
 				informer,
+				d.eventCount,
 			)
 			d.discoverers = append(d.discoverers, ingress)
 			go ingress.informer.Run(ctx.Done())
 		}
 	case RoleNode:
 		nodeInformer := d.newNodeInformer(ctx)
-		node := NewNode(log.With(d.logger, "role", "node"), nodeInformer)
+		node := NewNode(log.With(d.logger, "role", "node"), nodeInformer, d.eventCount)
 		d.discoverers = append(d.discoverers, node)
 		go node.informer.Run(ctx.Done())
 	default:
@@ -761,15 +799,21 @@ func (d *Discovery) newEndpointsByNodeInformer(plw *cache.ListWatch) cache.Share
 	indexers[nodeIndex] = func(obj interface{}) ([]string, error) {
 		e, ok := obj.(*apiv1.Endpoints)
 		if !ok {
-			return nil, fmt.Errorf("object is not a pod")
+			return nil, fmt.Errorf("object is not endpoints")
 		}
 		var nodes []string
 		for _, target := range e.Subsets {
 			for _, addr := range target.Addresses {
-				if addr.NodeName == nil {
-					continue
+				if addr.TargetRef != nil {
+					switch addr.TargetRef.Kind {
+					case "Pod":
+						if addr.NodeName != nil {
+							nodes = append(nodes, *addr.NodeName)
+						}
+					case "Node":
+						nodes = append(nodes, addr.TargetRef.Name)
+					}
 				}
-				nodes = append(nodes, *addr.NodeName)
 			}
 		}
 		return nodes, nil
@@ -789,17 +833,29 @@ func (d *Discovery) newEndpointSlicesByNodeInformer(plw *cache.ListWatch, object
 		switch e := obj.(type) {
 		case *disv1.EndpointSlice:
 			for _, target := range e.Endpoints {
-				if target.NodeName == nil {
-					continue
+				if target.TargetRef != nil {
+					switch target.TargetRef.Kind {
+					case "Pod":
+						if target.NodeName != nil {
+							nodes = append(nodes, *target.NodeName)
+						}
+					case "Node":
+						nodes = append(nodes, target.TargetRef.Name)
+					}
 				}
-				nodes = append(nodes, *target.NodeName)
 			}
 		case *disv1beta1.EndpointSlice:
 			for _, target := range e.Endpoints {
-				if target.NodeName == nil {
-					continue
+				if target.TargetRef != nil {
+					switch target.TargetRef.Kind {
+					case "Pod":
+						if target.NodeName != nil {
+							nodes = append(nodes, *target.NodeName)
+						}
+					case "Node":
+						nodes = append(nodes, target.TargetRef.Name)
+					}
 				}
-				nodes = append(nodes, *target.NodeName)
 			}
 		default:
 			return nil, fmt.Errorf("object is not an endpointslice")
@@ -825,3 +881,19 @@ func checkDiscoveryV1Supported(client kubernetes.Interface) (bool, error) {
 	// https://kubernetes.io/docs/reference/using-api/deprecation-guide/#v1-25
 	return semVer.Major() >= 1 && semVer.Minor() >= 21, nil
 }
+
+func addObjectMetaLabels(labelSet model.LabelSet, objectMeta metav1.ObjectMeta, role Role) {
+	labelSet[model.LabelName(metaLabelPrefix+string(role)+"_name")] = lv(objectMeta.Name)
+
+	for k, v := range objectMeta.Labels {
+		ln := strutil.SanitizeLabelName(k)
+		labelSet[model.LabelName(metaLabelPrefix+string(role)+"_label_"+ln)] = lv(v)
+		labelSet[model.LabelName(metaLabelPrefix+string(role)+"_labelpresent_"+ln)] = presentValue
+	}
+
+	for k, v := range objectMeta.Annotations {
+		ln := strutil.SanitizeLabelName(k)
+		labelSet[model.LabelName(metaLabelPrefix+string(role)+"_annotation_"+ln)] = lv(v)
+		labelSet[model.LabelName(metaLabelPrefix+string(role)+"_annotationpresent_"+ln)] = presentValue
+	}
+}

discovery/kubernetes/kubernetes_test.go

@@ -29,6 +29,8 @@ import (
 	"k8s.io/client-go/kubernetes/fake"
 	"k8s.io/client-go/tools/cache"
 
+	"github.com/prometheus/client_golang/prometheus"
+
 	"github.com/prometheus/prometheus/discovery"
 	"github.com/prometheus/prometheus/discovery/targetgroup"
 	"github.com/prometheus/prometheus/util/testutil"
@@ -49,13 +51,25 @@ func makeDiscoveryWithVersion(role Role, nsDiscovery NamespaceDiscovery, k8sVer
 	fakeDiscovery, _ := clientset.Discovery().(*fakediscovery.FakeDiscovery)
 	fakeDiscovery.FakedServerVersion = &version.Info{GitVersion: k8sVer}
 
-	return &Discovery{
+	d := &Discovery{
 		client:             clientset,
 		logger:             log.NewNopLogger(),
 		role:               role,
 		namespaceDiscovery: &nsDiscovery,
 		ownNamespace:       "own-ns",
-	}, clientset
+		eventCount: prometheus.NewCounterVec(
+			prometheus.CounterOpts{
+				Namespace: discovery.KubernetesMetricsNamespace,
+				Name:      "events_total",
+				Help:      "The number of Kubernetes events handled.",
+			},
+			[]string{"role", "event"},
+		),
+	}
+
+	d.metricRegisterer = discovery.NewMetricRegisterer(prometheus.NewRegistry(), []prometheus.Collector{d.eventCount})
+
+	return d, clientset
 }
 
 // makeDiscoveryWithMetadata creates a kubernetes.Discovery instance with the specified metadata config.

discovery/kubernetes/node.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	apiv1 "k8s.io/api/core/v1"
 	"k8s.io/client-go/tools/cache"
@@ -35,12 +36,6 @@ const (
 	NodeLegacyHostIP = "LegacyHostIP"
 )
 
-var (
-	nodeAddCount    = eventCount.WithLabelValues("node", "add")
-	nodeUpdateCount = eventCount.WithLabelValues("node", "update")
-	nodeDeleteCount = eventCount.WithLabelValues("node", "delete")
-)
-
 // Node discovers Kubernetes nodes.
 type Node struct {
 	logger   log.Logger
@@ -50,11 +45,22 @@ type Node struct {
 }
 
 // NewNode returns a new node discovery.
-func NewNode(l log.Logger, inf cache.SharedInformer) *Node {
+func NewNode(l log.Logger, inf cache.SharedInformer, eventCount *prometheus.CounterVec) *Node {
 	if l == nil {
 		l = log.NewNopLogger()
 	}
-	n := &Node{logger: l, informer: inf, store: inf.GetStore(), queue: workqueue.NewNamed("node")}
+
+	nodeAddCount := eventCount.WithLabelValues(RoleNode.String(), MetricLabelRoleAdd)
+	nodeUpdateCount := eventCount.WithLabelValues(RoleNode.String(), MetricLabelRoleUpdate)
+	nodeDeleteCount := eventCount.WithLabelValues(RoleNode.String(), MetricLabelRoleDelete)
+
+	n := &Node{
+		logger:   l,
+		informer: inf,
+		store:    inf.GetStore(),
+		queue:    workqueue.NewNamed(RoleNode.String()),
+	}
+
 	_, err := n.informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
 		AddFunc: func(o interface{}) {
 			nodeAddCount.Inc()
@@ -96,7 +102,7 @@ func (n *Node) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	}
 
 	go func() {
-		for n.process(ctx, ch) { // nolint:revive
+		for n.process(ctx, ch) {
 		}
 	}()
 
@@ -152,33 +158,18 @@ func nodeSourceFromName(name string) string {
 }
 
 const (
-	nodeNameLabel               = metaLabelPrefix + "node_name"
-	nodeProviderIDLabel         = metaLabelPrefix + "node_provider_id"
-	nodeLabelPrefix             = metaLabelPrefix + "node_label_"
-	nodeLabelPresentPrefix      = metaLabelPrefix + "node_labelpresent_"
-	nodeAnnotationPrefix        = metaLabelPrefix + "node_annotation_"
-	nodeAnnotationPresentPrefix = metaLabelPrefix + "node_annotationpresent_"
-	nodeAddressPrefix           = metaLabelPrefix + "node_address_"
+	nodeProviderIDLabel = metaLabelPrefix + "node_provider_id"
+	nodeAddressPrefix   = metaLabelPrefix + "node_address_"
 )
 
 func nodeLabels(n *apiv1.Node) model.LabelSet {
 	// Each label and annotation will create two key-value pairs in the map.
-	ls := make(model.LabelSet, 2*(len(n.Labels)+len(n.Annotations))+1)
+	ls := make(model.LabelSet)
 
-	ls[nodeNameLabel] = lv(n.Name)
 	ls[nodeProviderIDLabel] = lv(n.Spec.ProviderID)
 
-	for k, v := range n.Labels {
-		ln := strutil.SanitizeLabelName(k)
-		ls[model.LabelName(nodeLabelPrefix+ln)] = lv(v)
-		ls[model.LabelName(nodeLabelPresentPrefix+ln)] = presentValue
-	}
+	addObjectMetaLabels(ls, n.ObjectMeta, RoleNode)
 
-	for k, v := range n.Annotations {
-		ln := strutil.SanitizeLabelName(k)
-		ls[model.LabelName(nodeAnnotationPrefix+ln)] = lv(v)
-		ls[model.LabelName(nodeAnnotationPresentPrefix+ln)] = presentValue
-	}
 	return ls
 }
 
@@ -209,7 +200,7 @@ func (n *Node) buildNode(node *apiv1.Node) *targetgroup.Group {
 	return tg
 }
 
-// nodeAddresses returns the provided node's address, based on the priority:
+// nodeAddress returns the provided node's address, based on the priority:
 // 1. NodeInternalIP
 // 2. NodeInternalDNS
 // 3. NodeExternalIP
@@ -217,7 +208,7 @@ func (n *Node) buildNode(node *apiv1.Node) *targetgroup.Group {
 // 5. NodeLegacyHostIP
 // 6. NodeHostName
 //
-// Derived from k8s.io/kubernetes/pkg/util/node/node.go
+// Derived from k8s.io/kubernetes/pkg/util/node/node.go.
 func nodeAddress(node *apiv1.Node) (string, map[apiv1.NodeAddressType][]string, error) {
 	m := map[apiv1.NodeAddressType][]string{}
 	for _, a := range node.Status.Addresses {

discovery/kubernetes/pod.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	apiv1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -30,17 +31,10 @@ import (
 	"k8s.io/client-go/util/workqueue"
 
 	"github.com/prometheus/prometheus/discovery/targetgroup"
-	"github.com/prometheus/prometheus/util/strutil"
 )
 
 const nodeIndex = "node"
 
-var (
-	podAddCount    = eventCount.WithLabelValues("pod", "add")
-	podUpdateCount = eventCount.WithLabelValues("pod", "update")
-	podDeleteCount = eventCount.WithLabelValues("pod", "delete")
-)
-
 // Pod discovers new pod targets.
 type Pod struct {
 	podInf           cache.SharedIndexInformer
@@ -52,18 +46,22 @@ type Pod struct {
 }
 
 // NewPod creates a new pod discovery.
-func NewPod(l log.Logger, pods cache.SharedIndexInformer, nodes cache.SharedInformer) *Pod {
+func NewPod(l log.Logger, pods cache.SharedIndexInformer, nodes cache.SharedInformer, eventCount *prometheus.CounterVec) *Pod {
 	if l == nil {
 		l = log.NewNopLogger()
 	}
 
+	podAddCount := eventCount.WithLabelValues(RolePod.String(), MetricLabelRoleAdd)
+	podDeleteCount := eventCount.WithLabelValues(RolePod.String(), MetricLabelRoleDelete)
+	podUpdateCount := eventCount.WithLabelValues(RolePod.String(), MetricLabelRoleUpdate)
+
 	p := &Pod{
 		podInf:           pods,
 		nodeInf:          nodes,
 		withNodeMetadata: nodes != nil,
 		store:            pods.GetStore(),
 		logger:           l,
-		queue:            workqueue.NewNamed("pod"),
+		queue:            workqueue.NewNamed(RolePod.String()),
 	}
 	_, err := p.podInf.AddEventHandler(cache.ResourceEventHandlerFuncs{
 		AddFunc: func(o interface{}) {
@@ -132,7 +130,7 @@ func (p *Pod) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	}
 
 	go func() {
-		for p.process(ctx, ch) { // nolint:revive
+		for p.process(ctx, ch) {
 		}
 	}()
 
@@ -180,7 +178,6 @@ func convertToPod(o interface{}) (*apiv1.Pod, error) {
 }
 
 const (
-	podNameLabel                  = metaLabelPrefix + "pod_name"
 	podIPLabel                    = metaLabelPrefix + "pod_ip"
 	podContainerNameLabel         = metaLabelPrefix + "pod_container_name"
 	podContainerIDLabel           = metaLabelPrefix + "pod_container_id"
@@ -191,10 +188,6 @@ const (
 	podContainerIsInit            = metaLabelPrefix + "pod_container_init"
 	podReadyLabel                 = metaLabelPrefix + "pod_ready"
 	podPhaseLabel                 = metaLabelPrefix + "pod_phase"
-	podLabelPrefix                = metaLabelPrefix + "pod_label_"
-	podLabelPresentPrefix         = metaLabelPrefix + "pod_labelpresent_"
-	podAnnotationPrefix           = metaLabelPrefix + "pod_annotation_"
-	podAnnotationPresentPrefix    = metaLabelPrefix + "pod_annotationpresent_"
 	podNodeNameLabel              = metaLabelPrefix + "pod_node_name"
 	podHostIPLabel                = metaLabelPrefix + "pod_host_ip"
 	podUID                        = metaLabelPrefix + "pod_uid"
@@ -215,7 +208,6 @@ func GetControllerOf(controllee metav1.Object) *metav1.OwnerReference {
 
 func podLabels(pod *apiv1.Pod) model.LabelSet {
 	ls := model.LabelSet{
-		podNameLabel:     lv(pod.ObjectMeta.Name),
 		podIPLabel:       lv(pod.Status.PodIP),
 		podReadyLabel:    podReady(pod),
 		podPhaseLabel:    lv(string(pod.Status.Phase)),
@@ -224,6 +216,8 @@ func podLabels(pod *apiv1.Pod) model.LabelSet {
 		podUID:           lv(string(pod.ObjectMeta.UID)),
 	}
 
+	addObjectMetaLabels(ls, pod.ObjectMeta, RolePod)
+
 	createdBy := GetControllerOf(pod)
 	if createdBy != nil {
 		if createdBy.Kind != "" {
@@ -234,18 +228,6 @@ func podLabels(pod *apiv1.Pod) model.LabelSet {
 		}
 	}
 
-	for k, v := range pod.Labels {
-		ln := strutil.SanitizeLabelName(k)
-		ls[model.LabelName(podLabelPrefix+ln)] = lv(v)
-		ls[model.LabelName(podLabelPresentPrefix+ln)] = presentValue
-	}
-
-	for k, v := range pod.Annotations {
-		ln := strutil.SanitizeLabelName(k)
-		ls[model.LabelName(podAnnotationPrefix+ln)] = lv(v)
-		ls[model.LabelName(podAnnotationPresentPrefix+ln)] = presentValue
-	}
-
 	return ls
 }
 

discovery/kubernetes/service.go

@@ -22,19 +22,13 @@ import (
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	apiv1 "k8s.io/api/core/v1"
 	"k8s.io/client-go/tools/cache"
 	"k8s.io/client-go/util/workqueue"
 
 	"github.com/prometheus/prometheus/discovery/targetgroup"
-	"github.com/prometheus/prometheus/util/strutil"
-)
-
-var (
-	svcAddCount    = eventCount.WithLabelValues("service", "add")
-	svcUpdateCount = eventCount.WithLabelValues("service", "update")
-	svcDeleteCount = eventCount.WithLabelValues("service", "delete")
 )
 
 // Service implements discovery of Kubernetes services.
@@ -46,11 +40,22 @@ type Service struct {
 }
 
 // NewService returns a new service discovery.
-func NewService(l log.Logger, inf cache.SharedInformer) *Service {
+func NewService(l log.Logger, inf cache.SharedInformer, eventCount *prometheus.CounterVec) *Service {
 	if l == nil {
 		l = log.NewNopLogger()
 	}
-	s := &Service{logger: l, informer: inf, store: inf.GetStore(), queue: workqueue.NewNamed("service")}
+
+	svcAddCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleAdd)
+	svcUpdateCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleUpdate)
+	svcDeleteCount := eventCount.WithLabelValues(RoleService.String(), MetricLabelRoleDelete)
+
+	s := &Service{
+		logger:   l,
+		informer: inf,
+		store:    inf.GetStore(),
+		queue:    workqueue.NewNamed(RoleService.String()),
+	}
+
 	_, err := s.informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
 		AddFunc: func(o interface{}) {
 			svcAddCount.Inc()
@@ -92,7 +97,7 @@ func (s *Service) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	}
 
 	go func() {
-		for s.process(ctx, ch) { // nolint:revive
+		for s.process(ctx, ch) {
 		}
 	}()
 
@@ -147,38 +152,20 @@ func serviceSourceFromNamespaceAndName(namespace, name string) string {
 }
 
 const (
-	serviceNameLabel               = metaLabelPrefix + "service_name"
-	serviceLabelPrefix             = metaLabelPrefix + "service_label_"
-	serviceLabelPresentPrefix      = metaLabelPrefix + "service_labelpresent_"
-	serviceAnnotationPrefix        = metaLabelPrefix + "service_annotation_"
-	serviceAnnotationPresentPrefix = metaLabelPrefix + "service_annotationpresent_"
-	servicePortNameLabel           = metaLabelPrefix + "service_port_name"
-	servicePortNumberLabel         = metaLabelPrefix + "service_port_number"
-	servicePortProtocolLabel       = metaLabelPrefix + "service_port_protocol"
-	serviceClusterIPLabel          = metaLabelPrefix + "service_cluster_ip"
-	serviceLoadBalancerIP          = metaLabelPrefix + "service_loadbalancer_ip"
-	serviceExternalNameLabel       = metaLabelPrefix + "service_external_name"
-	serviceType                    = metaLabelPrefix + "service_type"
+	servicePortNameLabel     = metaLabelPrefix + "service_port_name"
+	servicePortNumberLabel   = metaLabelPrefix + "service_port_number"
+	servicePortProtocolLabel = metaLabelPrefix + "service_port_protocol"
+	serviceClusterIPLabel    = metaLabelPrefix + "service_cluster_ip"
+	serviceLoadBalancerIP    = metaLabelPrefix + "service_loadbalancer_ip"
+	serviceExternalNameLabel = metaLabelPrefix + "service_external_name"
+	serviceType              = metaLabelPrefix + "service_type"
 )
 
 func serviceLabels(svc *apiv1.Service) model.LabelSet {
-	// Each label and annotation will create two key-value pairs in the map.
-	ls := make(model.LabelSet, 2*(len(svc.Labels)+len(svc.Annotations))+2)
-
-	ls[serviceNameLabel] = lv(svc.Name)
+	ls := make(model.LabelSet)
 	ls[namespaceLabel] = lv(svc.Namespace)
+	addObjectMetaLabels(ls, svc.ObjectMeta, RoleService)
 
-	for k, v := range svc.Labels {
-		ln := strutil.SanitizeLabelName(k)
-		ls[model.LabelName(serviceLabelPrefix+ln)] = lv(v)
-		ls[model.LabelName(serviceLabelPresentPrefix+ln)] = presentValue
-	}
-
-	for k, v := range svc.Annotations {
-		ln := strutil.SanitizeLabelName(k)
-		ls[model.LabelName(serviceAnnotationPrefix+ln)] = lv(v)
-		ls[model.LabelName(serviceAnnotationPresentPrefix+ln)] = presentValue
-	}
 	return ls
 }
 

discovery/legacymanager/manager.go

@@ -28,48 +28,6 @@ import (
 	"github.com/prometheus/prometheus/discovery/targetgroup"
 )
 
-var (
-	failedConfigs = prometheus.NewGaugeVec(
-		prometheus.GaugeOpts{
-			Name: "prometheus_sd_failed_configs",
-			Help: "Current number of service discovery configurations that failed to load.",
-		},
-		[]string{"name"},
-	)
-	discoveredTargets = prometheus.NewGaugeVec(
-		prometheus.GaugeOpts{
-			Name: "prometheus_sd_discovered_targets",
-			Help: "Current number of discovered targets.",
-		},
-		[]string{"name", "config"},
-	)
-	receivedUpdates = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "prometheus_sd_received_updates_total",
-			Help: "Total number of update events received from the SD providers.",
-		},
-		[]string{"name"},
-	)
-	delayedUpdates = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "prometheus_sd_updates_delayed_total",
-			Help: "Total number of update events that couldn't be sent immediately.",
-		},
-		[]string{"name"},
-	)
-	sentUpdates = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "prometheus_sd_updates_total",
-			Help: "Total number of update events sent to the SD consumers.",
-		},
-		[]string{"name"},
-	)
-)
-
-func RegisterMetrics() {
-	prometheus.MustRegister(failedConfigs, discoveredTargets, receivedUpdates, delayedUpdates, sentUpdates)
-}
-
 type poolKey struct {
 	setName  string
 	provider string
@@ -84,7 +42,7 @@ type provider struct {
 }
 
 // NewManager is the Discovery Manager constructor.
-func NewManager(ctx context.Context, logger log.Logger, options ...func(*Manager)) *Manager {
+func NewManager(ctx context.Context, logger log.Logger, registerer prometheus.Registerer, options ...func(*Manager)) *Manager {
 	if logger == nil {
 		logger = log.NewNopLogger()
 	}
@@ -96,10 +54,21 @@ func NewManager(ctx context.Context, logger log.Logger, options ...func(*Manager
 		ctx:            ctx,
 		updatert:       5 * time.Second,
 		triggerSend:    make(chan struct{}, 1),
+		registerer:     registerer,
 	}
 	for _, option := range options {
 		option(mgr)
 	}
+
+	// Register the metrics.
+	// We have to do this after setting all options, so that the name of the Manager is set.
+	if metrics, err := discovery.NewMetrics(registerer, mgr.name); err == nil {
+		mgr.metrics = metrics
+	} else {
+		level.Error(logger).Log("msg", "Failed to create discovery manager metrics", "manager", mgr.name, "err", err)
+		return nil
+	}
+
 	return mgr
 }
 
@@ -135,16 +104,19 @@ type Manager struct {
 
 	// The triggerSend channel signals to the manager that new updates have been received from providers.
 	triggerSend chan struct{}
+
+	// A registerer for all service discovery metrics.
+	registerer prometheus.Registerer
+
+	metrics *discovery.Metrics
 }
 
-// Run starts the background processing
+// Run starts the background processing.
 func (m *Manager) Run() error {
 	go m.sender()
-	for range m.ctx.Done() {
-		m.cancelDiscoverers()
-		return m.ctx.Err()
-	}
-	return nil
+	<-m.ctx.Done()
+	m.cancelDiscoverers()
+	return m.ctx.Err()
 }
 
 // SyncCh returns a read only channel used by all the clients to receive target updates.
@@ -159,7 +131,7 @@ func (m *Manager) ApplyConfig(cfg map[string]discovery.Configs) error {
 
 	for pk := range m.targets {
 		if _, ok := cfg[pk.setName]; !ok {
-			discoveredTargets.DeleteLabelValues(m.name, pk.setName)
+			m.metrics.DiscoveredTargets.DeleteLabelValues(m.name, pk.setName)
 		}
 	}
 	m.cancelDiscoverers()
@@ -170,9 +142,9 @@ func (m *Manager) ApplyConfig(cfg map[string]discovery.Configs) error {
 	failedCount := 0
 	for name, scfg := range cfg {
 		failedCount += m.registerProviders(scfg, name)
-		discoveredTargets.WithLabelValues(m.name, name).Set(0)
+		m.metrics.DiscoveredTargets.WithLabelValues(name).Set(0)
 	}
-	failedConfigs.WithLabelValues(m.name).Set(float64(failedCount))
+	m.metrics.FailedConfigs.Set(float64(failedCount))
 
 	for _, prov := range m.providers {
 		m.startProvider(m.ctx, prov)
@@ -209,7 +181,7 @@ func (m *Manager) updater(ctx context.Context, p *provider, updates chan []*targ
 		case <-ctx.Done():
 			return
 		case tgs, ok := <-updates:
-			receivedUpdates.WithLabelValues(m.name).Inc()
+			m.metrics.ReceivedUpdates.Inc()
 			if !ok {
 				level.Debug(m.logger).Log("msg", "Discoverer channel closed", "provider", p.name)
 				return
@@ -238,11 +210,11 @@ func (m *Manager) sender() {
 		case <-ticker.C: // Some discoverers send updates too often so we throttle these with the ticker.
 			select {
 			case <-m.triggerSend:
-				sentUpdates.WithLabelValues(m.name).Inc()
+				m.metrics.SentUpdates.Inc()
 				select {
 				case m.syncCh <- m.allGroups():
 				default:
-					delayedUpdates.WithLabelValues(m.name).Inc()
+					m.metrics.DelayedUpdates.Inc()
 					level.Debug(m.logger).Log("msg", "Discovery receiver's channel was full so will retry the next cycle")
 					select {
 					case m.triggerSend <- struct{}{}:
@@ -290,7 +262,7 @@ func (m *Manager) allGroups() map[string][]*targetgroup.Group {
 		}
 	}
 	for setName, v := range n {
-		discoveredTargets.WithLabelValues(m.name, setName).Set(float64(v))
+		m.metrics.DiscoveredTargets.WithLabelValues(setName).Set(float64(v))
 	}
 	return tSets
 }
@@ -311,7 +283,8 @@ func (m *Manager) registerProviders(cfgs discovery.Configs, setName string) int
 		}
 		typ := cfg.Name()
 		d, err := cfg.NewDiscoverer(discovery.DiscovererOptions{
-			Logger: log.With(m.logger, "discovery", typ, "config", setName),
+			Logger:     log.With(m.logger, "discovery", typ, "config", setName),
+			Registerer: m.registerer,
 		})
 		if err != nil {
 			level.Error(m.logger).Log("msg", "Cannot create service discovery", "err", err, "type", typ, "config", setName)

discovery/legacymanager/manager_test.go

@@ -22,6 +22,7 @@ import (
 	"time"
 
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	client_testutil "github.com/prometheus/client_golang/prometheus/testutil"
 	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
@@ -664,7 +665,8 @@ func TestTargetUpdatesOrder(t *testing.T) {
 			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 			defer cancel()
 
-			discoveryManager := NewManager(ctx, log.NewNopLogger())
+			discoveryManager := NewManager(ctx, log.NewNopLogger(), prometheus.NewRegistry())
+			require.NotNil(t, discoveryManager)
 			discoveryManager.updatert = 100 * time.Millisecond
 
 			var totalUpdatesCount int
@@ -746,7 +748,8 @@ func verifyPresence(t *testing.T, tSets map[poolKey]map[string]*targetgroup.Grou
 func TestTargetSetRecreatesTargetGroupsEveryRun(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	discoveryManager := NewManager(ctx, log.NewNopLogger())
+	discoveryManager := NewManager(ctx, log.NewNopLogger(), prometheus.NewRegistry())
+	require.NotNil(t, discoveryManager)
 	discoveryManager.updatert = 100 * time.Millisecond
 	go discoveryManager.Run()
 
@@ -774,7 +777,8 @@ func TestTargetSetRecreatesTargetGroupsEveryRun(t *testing.T) {
 func TestDiscovererConfigs(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	discoveryManager := NewManager(ctx, log.NewNopLogger())
+	discoveryManager := NewManager(ctx, log.NewNopLogger(), prometheus.NewRegistry())
+	require.NotNil(t, discoveryManager)
 	discoveryManager.updatert = 100 * time.Millisecond
 	go discoveryManager.Run()
 
@@ -798,7 +802,8 @@ func TestDiscovererConfigs(t *testing.T) {
 func TestTargetSetRecreatesEmptyStaticConfigs(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	discoveryManager := NewManager(ctx, log.NewNopLogger())
+	discoveryManager := NewManager(ctx, log.NewNopLogger(), prometheus.NewRegistry())
+	require.NotNil(t, discoveryManager)
 	discoveryManager.updatert = 100 * time.Millisecond
 	go discoveryManager.Run()
 
@@ -837,7 +842,8 @@ func TestTargetSetRecreatesEmptyStaticConfigs(t *testing.T) {
 func TestIdenticalConfigurationsAreCoalesced(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	discoveryManager := NewManager(ctx, nil)
+	discoveryManager := NewManager(ctx, nil, prometheus.NewRegistry())
+	require.NotNil(t, discoveryManager)
 	discoveryManager.updatert = 100 * time.Millisecond
 	go discoveryManager.Run()
 
@@ -868,7 +874,8 @@ func TestApplyConfigDoesNotModifyStaticTargets(t *testing.T) {
 	}
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	discoveryManager := NewManager(ctx, log.NewNopLogger())
+	discoveryManager := NewManager(ctx, log.NewNopLogger(), prometheus.NewRegistry())
+	require.NotNil(t, discoveryManager)
 	discoveryManager.updatert = 100 * time.Millisecond
 	go discoveryManager.Run()
 
@@ -893,7 +900,8 @@ func (e errorConfig) NewDiscoverer(discovery.DiscovererOptions) (discovery.Disco
 func TestGaugeFailedConfigs(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	discoveryManager := NewManager(ctx, log.NewNopLogger())
+	discoveryManager := NewManager(ctx, log.NewNopLogger(), prometheus.NewRegistry())
+	require.NotNil(t, discoveryManager)
 	discoveryManager.updatert = 100 * time.Millisecond
 	go discoveryManager.Run()
 
@@ -907,7 +915,7 @@ func TestGaugeFailedConfigs(t *testing.T) {
 	discoveryManager.ApplyConfig(c)
 	<-discoveryManager.SyncCh()
 
-	failedCount := client_testutil.ToFloat64(failedConfigs)
+	failedCount := client_testutil.ToFloat64(discoveryManager.metrics.FailedConfigs)
 	if failedCount != 3 {
 		t.Fatalf("Expected to have 3 failed configs, got: %v", failedCount)
 	}
@@ -918,7 +926,7 @@ func TestGaugeFailedConfigs(t *testing.T) {
 	discoveryManager.ApplyConfig(c)
 	<-discoveryManager.SyncCh()
 
-	failedCount = client_testutil.ToFloat64(failedConfigs)
+	failedCount = client_testutil.ToFloat64(discoveryManager.metrics.FailedConfigs)
 	if failedCount != 0 {
 		t.Fatalf("Expected to get no failed config, got: %v", failedCount)
 	}
@@ -1049,7 +1057,8 @@ func TestCoordinationWithReceiver(t *testing.T) {
 			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 			defer cancel()
 
-			mgr := NewManager(ctx, nil)
+			mgr := NewManager(ctx, nil, prometheus.NewRegistry())
+			require.NotNil(t, mgr)
 			mgr.updatert = updateDelay
 			go mgr.Run()
 

discovery/linode/linode.go

@@ -51,6 +51,7 @@ const (
 	linodeLabelStatus             = linodeLabel + "status"
 	linodeLabelTags               = linodeLabel + "tags"
 	linodeLabelGroup              = linodeLabel + "group"
+	linodeLabelGPUs               = linodeLabel + "gpus"
 	linodeLabelHypervisor         = linodeLabel + "hypervisor"
 	linodeLabelBackups            = linodeLabel + "backups"
 	linodeLabelSpecsDiskBytes     = linodeLabel + "specs_disk_bytes"
@@ -66,24 +67,15 @@ const (
 )
 
 // DefaultSDConfig is the default Linode SD configuration.
-var (
-	DefaultSDConfig = SDConfig{
-		TagSeparator:     ",",
-		Port:             80,
-		RefreshInterval:  model.Duration(60 * time.Second),
-		HTTPClientConfig: config.DefaultHTTPClientConfig,
-	}
-
-	failuresCount = prometheus.NewCounter(
-		prometheus.CounterOpts{
-			Name: "prometheus_sd_linode_failures_total",
-			Help: "Number of Linode service discovery refresh failures.",
-		})
-)
+var DefaultSDConfig = SDConfig{
+	TagSeparator:     ",",
+	Port:             80,
+	RefreshInterval:  model.Duration(60 * time.Second),
+	HTTPClientConfig: config.DefaultHTTPClientConfig,
+}
 
 func init() {
 	discovery.RegisterConfig(&SDConfig{})
-	prometheus.MustRegister(failuresCount)
 }
 
 // SDConfig is the configuration for Linode based service discovery.
@@ -100,7 +92,7 @@ func (*SDConfig) Name() string { return "linode" }
 
 // NewDiscoverer returns a Discoverer for the Config.
 func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
-	return NewDiscovery(c, opts.Logger)
+	return NewDiscovery(c, opts.Logger, opts.Registerer)
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -130,16 +122,22 @@ type Discovery struct {
 	pollCount            int
 	lastResults          []*targetgroup.Group
 	eventPollingEnabled  bool
+	failuresCount        prometheus.Counter
 }
 
 // NewDiscovery returns a new Discovery which periodically refreshes its targets.
-func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
+func NewDiscovery(conf *SDConfig, logger log.Logger, reg prometheus.Registerer) (*Discovery, error) {
 	d := &Discovery{
 		port:                 conf.Port,
 		tagSeparator:         conf.TagSeparator,
 		pollCount:            0,
 		lastRefreshTimestamp: time.Now().UTC(),
 		eventPollingEnabled:  true,
+		failuresCount: prometheus.NewCounter(
+			prometheus.CounterOpts{
+				Name: "prometheus_sd_linode_failures_total",
+				Help: "Number of Linode service discovery refresh failures.",
+			}),
 	}
 
 	rt, err := config.NewRoundTripperFromConfig(conf.HTTPClientConfig, "linode_sd")
@@ -157,10 +155,14 @@ func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
 	d.client = &client
 
 	d.Discovery = refresh.NewDiscovery(
-		logger,
-		"linode",
-		time.Duration(conf.RefreshInterval),
-		d.refresh,
+		refresh.Options{
+			Logger:   logger,
+			Mech:     "linode",
+			Interval: time.Duration(conf.RefreshInterval),
+			RefreshF: d.refresh,
+			Registry: reg,
+			Metrics:  []prometheus.Collector{d.failuresCount},
+		},
 	)
 	return d, nil
 }
@@ -221,14 +223,14 @@ func (d *Discovery) refreshData(ctx context.Context) ([]*targetgroup.Group, erro
 	// Gather all linode instances.
 	instances, err := d.client.ListInstances(ctx, &linodego.ListOptions{PageSize: 500})
 	if err != nil {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, err
 	}
 
 	// Gather detailed IP address info for all IPs on all linode instances.
 	detailedIPs, err := d.client.ListIPAddresses(ctx, &linodego.ListOptions{PageSize: 500})
 	if err != nil {
-		failuresCount.Inc()
+		d.failuresCount.Inc()
 		return nil, err
 	}
 
@@ -302,12 +304,13 @@ func (d *Discovery) refreshData(ctx context.Context) ([]*targetgroup.Group, erro
 			linodeLabelType:               model.LabelValue(instance.Type),
 			linodeLabelStatus:             model.LabelValue(instance.Status),
 			linodeLabelGroup:              model.LabelValue(instance.Group),
+			linodeLabelGPUs:               model.LabelValue(fmt.Sprintf("%d", instance.Specs.GPUs)),
 			linodeLabelHypervisor:         model.LabelValue(instance.Hypervisor),
 			linodeLabelBackups:            model.LabelValue(backupsStatus),
-			linodeLabelSpecsDiskBytes:     model.LabelValue(fmt.Sprintf("%d", instance.Specs.Disk<<20)),
-			linodeLabelSpecsMemoryBytes:   model.LabelValue(fmt.Sprintf("%d", instance.Specs.Memory<<20)),
+			linodeLabelSpecsDiskBytes:     model.LabelValue(fmt.Sprintf("%d", int64(instance.Specs.Disk)<<20)),
+			linodeLabelSpecsMemoryBytes:   model.LabelValue(fmt.Sprintf("%d", int64(instance.Specs.Memory)<<20)),
 			linodeLabelSpecsVCPUs:         model.LabelValue(fmt.Sprintf("%d", instance.Specs.VCPUs)),
-			linodeLabelSpecsTransferBytes: model.LabelValue(fmt.Sprintf("%d", instance.Specs.Transfer<<20)),
+			linodeLabelSpecsTransferBytes: model.LabelValue(fmt.Sprintf("%d", int64(instance.Specs.Transfer)<<20)),
 		}
 
 		addr := net.JoinHostPort(publicIPv4, strconv.FormatUint(uint64(d.port), 10))

discovery/linode/linode_test.go

@@ -20,6 +20,7 @@ import (
 	"testing"
 
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/config"
 	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
@@ -52,7 +53,7 @@ func TestLinodeSDRefresh(t *testing.T) {
 		Credentials: tokenID,
 		Type:        "Bearer",
 	}
-	d, err := NewDiscovery(&cfg, log.NewNopLogger())
+	d, err := NewDiscovery(&cfg, log.NewNopLogger(), prometheus.NewRegistry())
 	require.NoError(t, err)
 	endpoint, err := url.Parse(sdmock.Mock.Endpoint())
 	require.NoError(t, err)
@@ -61,12 +62,12 @@ func TestLinodeSDRefresh(t *testing.T) {
 	tgs, err := d.refresh(context.Background())
 	require.NoError(t, err)
 
-	require.Equal(t, 1, len(tgs))
+	require.Len(t, tgs, 1)
 
 	tg := tgs[0]
 	require.NotNil(t, tg)
 	require.NotNil(t, tg.Targets)
-	require.Equal(t, 4, len(tg.Targets))
+	require.Len(t, tg.Targets, 4)
 
 	for i, lbls := range []model.LabelSet{
 		{
@@ -85,6 +86,7 @@ func TestLinodeSDRefresh(t *testing.T) {
 			"__meta_linode_status":               model.LabelValue("running"),
 			"__meta_linode_tags":                 model.LabelValue(",monitoring,"),
 			"__meta_linode_group":                model.LabelValue(""),
+			"__meta_linode_gpus":                 model.LabelValue("0"),
 			"__meta_linode_hypervisor":           model.LabelValue("kvm"),
 			"__meta_linode_backups":              model.LabelValue("disabled"),
 			"__meta_linode_specs_disk_bytes":     model.LabelValue("85899345920"),
@@ -109,6 +111,7 @@ func TestLinodeSDRefresh(t *testing.T) {
 			"__meta_linode_status":               model.LabelValue("running"),
 			"__meta_linode_tags":                 model.LabelValue(",monitoring,"),
 			"__meta_linode_group":                model.LabelValue(""),
+			"__meta_linode_gpus":                 model.LabelValue("0"),
 			"__meta_linode_hypervisor":           model.LabelValue("kvm"),
 			"__meta_linode_backups":              model.LabelValue("disabled"),
 			"__meta_linode_specs_disk_bytes":     model.LabelValue("85899345920"),
@@ -132,6 +135,7 @@ func TestLinodeSDRefresh(t *testing.T) {
 			"__meta_linode_status":               model.LabelValue("running"),
 			"__meta_linode_tags":                 model.LabelValue(",monitoring,"),
 			"__meta_linode_group":                model.LabelValue(""),
+			"__meta_linode_gpus":                 model.LabelValue("0"),
 			"__meta_linode_hypervisor":           model.LabelValue("kvm"),
 			"__meta_linode_backups":              model.LabelValue("disabled"),
 			"__meta_linode_specs_disk_bytes":     model.LabelValue("53687091200"),
@@ -155,6 +159,7 @@ func TestLinodeSDRefresh(t *testing.T) {
 			"__meta_linode_status":               model.LabelValue("running"),
 			"__meta_linode_tags":                 model.LabelValue(",monitoring,"),
 			"__meta_linode_group":                model.LabelValue(""),
+			"__meta_linode_gpus":                 model.LabelValue("0"),
 			"__meta_linode_hypervisor":           model.LabelValue("kvm"),
 			"__meta_linode_backups":              model.LabelValue("disabled"),
 			"__meta_linode_specs_disk_bytes":     model.LabelValue("26843545600"),