Merge branch 'main' into mantine-ui

Signed-off-by: Julius Volz <julius.volz@gmail.com>

.github/workflows/buf-lint.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: bufbuild/buf-setup-action@dde0b9351db90fbf78e345f41a57de8514bf1091 # v1.32.2
+      - uses: bufbuild/buf-setup-action@35c243d7f2a909b1d4e40399b348a7fdab27d78d # v1.34.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
       - uses: bufbuild/buf-lint-action@06f9dd823d873146471cfaaf108a993fe00e5325 # v1.1.1

.github/workflows/buf.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.repository_owner == 'prometheus'
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
-      - uses: bufbuild/buf-setup-action@dde0b9351db90fbf78e345f41a57de8514bf1091 # v1.32.2
+      - uses: bufbuild/buf-setup-action@35c243d7f2a909b1d4e40399b348a7fdab27d78d # v1.34.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
       - uses: bufbuild/buf-lint-action@06f9dd823d873146471cfaaf108a993fe00e5325 # v1.1.1

.github/workflows/ci.yml

@@ -143,6 +143,18 @@ jobs:
         with:
           parallelism: 12
           thread: ${{ matrix.thread }}
+  build_all_status:
+    name: Report status of build Prometheus for all architectures
+    runs-on: ubuntu-latest
+    needs: [build_all]
+    if: github.event_name == 'pull_request' && startsWith(github.event.pull_request.base.ref, 'release-')
+    steps:
+      - name: Successful build
+        if: ${{ !(contains(needs.*.result, 'failure')) && !(contains(needs.*.result, 'cancelled')) }}
+        run: exit 0
+      - name: Failing or cancelled build
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
+        run: exit 1
   check_generated_parser:
     name: Check generated parser
     runs-on: ubuntu-latest

.github/workflows/codeql-analysis.yml

@@ -27,12 +27,12 @@ jobs:
         uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
 
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@2e230e8fe0ad3a14a340ad0815ddb96d599d2aff # v3.25.8
+        uses: github/codeql-action/init@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11
         with:
           languages: ${{ matrix.language }}
 
       - name: Autobuild
-        uses: github/codeql-action/autobuild@2e230e8fe0ad3a14a340ad0815ddb96d599d2aff # v3.25.8
+        uses: github/codeql-action/autobuild@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@2e230e8fe0ad3a14a340ad0815ddb96d599d2aff # v3.25.8
+        uses: github/codeql-action/analyze@b611370bb5703a7efb587f9d136a52ea24c5c38c # v3.25.11

.github/workflows/scorecards.yml

@@ -45,6 +45,6 @@ jobs:
 
       # Upload the results to GitHub's code scanning dashboard.
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@2e230e8fe0ad3a14a340ad0815ddb96d599d2aff # tag=v3.25.8
+        uses: github/codeql-action/upload-sarif@b611370bb5703a7efb587f9d136a52ea24c5c38c # tag=v3.25.11
         with:
           sarif_file: results.sarif

.golangci.yml

@@ -1,12 +1,5 @@
 run:
   timeout: 15m
-  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
@@ -33,6 +26,13 @@ linters:
 
 issues:
   max-same-issues: 0
+  exclude-files:
+    # Skip autogenerated files.
+    - ^.*\.(pb|y)\.go$
+  exclude-dirs:
+    # Copied it from a different source
+    - storage/remote/otlptranslator/prometheusremotewrite
+    - storage/remote/otlptranslator/prometheus
   exclude-rules:
     - linters:
         - gocritic

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 ## unreleased
 
+* [FEATURE] OTLP receiver: Add new option `otlp.promote_resource_attributes`, for any OTel resource attributes that should be promoted to metric labels. #14200
+* [FEATURE] Remote-Write: Add sender and receiver support for [Remote Write 2.0-rc.2](https://prometheus.io/docs/specs/remote_write_spec_2_0/) specification #14395 #14427 #14444
+* [ENHANCEMENT] Remote-Write: 1.x messages against Remote Write 2.x Receivers will have now correct values for `prometheus_storage_<samples|histograms|exemplar>_failed_total` in case of partial errors #14444
+
+## 2.53.1 / 2024-07-10
+
+Fix a bug which would drop samples in remote-write if the sending flow stalled
+for longer than it takes to write one "WAL segment". How long this takes depends on the size
+of your Prometheus; as a rough guide with 10 million series it is about 2-3 minutes.
+
+* [BUGFIX] Remote-write: stop dropping samples in catch-up #14446
+
 ## 2.53.0 / 2024-06-16
 
 This release changes the default for GOGC, the Go runtime control for the trade-off between excess memory use and CPU usage. We have found that Prometheus operates with minimal additional CPU usage, but greatly reduced memory by adjusting the upstream Go default from 100 to 75.

README.md

@@ -12,9 +12,10 @@ examples and guides.</p>
 [![Docker Pulls](https://img.shields.io/docker/pulls/prom/prometheus.svg?maxAge=604800)][hub]
 [![Go Report Card](https://goreportcard.com/badge/github.com/prometheus/prometheus)](https://goreportcard.com/report/github.com/prometheus/prometheus)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/486/badge)](https://bestpractices.coreinfrastructure.org/projects/486)
+[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/prometheus/prometheus/badge)](https://securityscorecards.dev/viewer/?uri=github.com/prometheus/prometheus)
+[![CLOMonitor](https://img.shields.io/endpoint?url=https://clomonitor.io/api/projects/cncf/prometheus/badge)](https://clomonitor.io/projects/cncf/prometheus)
 [![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://securityscorecards.dev/viewer/?uri=github.com/prometheus/prometheus)
 
 </div>
 

SECURITY-INSIGHTS.yml

@@ -0,0 +1,48 @@
+header:
+  schema-version: '1.0.0'
+  expiration-date: '2025-07-30T01:00:00.000Z'
+  last-updated: '2024-07-30'
+  last-reviewed: '2024-07-30'
+  project-url: https://github.com/prometheus/prometheus
+  changelog: https://github.com/prometheus/prometheus/blob/main/CHANGELOG.md
+  license: https://github.com/prometheus/prometheus/blob/main/LICENSE
+project-lifecycle:
+  status: active
+  bug-fixes-only: false
+  core-maintainers:
+    - https://github.com/prometheus/prometheus/blob/main/MAINTAINERS.md
+contribution-policy:
+  accepts-pull-requests: true
+  accepts-automated-pull-requests: true
+dependencies:
+  third-party-packages: true
+  dependencies-lists:
+    - https://github.com/prometheus/prometheus/blob/main/go.mod
+    - https://github.com/prometheus/prometheus/blob/main/web/ui/package.json
+  env-dependencies-policy:
+    policy-url: https://github.com/prometheus/prometheus/blob/main/CONTRIBUTING.md#dependency-management
+distribution-points:
+  - https://github.com/prometheus/prometheus/releases
+documentation:
+  - https://prometheus.io/docs/introduction/overview/
+security-contacts:
+  - type: email
+    value: prometheus-team@googlegroups.com
+security-testing:
+  - tool-type: sca
+    tool-name: Dependabot
+    tool-version: latest
+    integration:
+      ad-hoc: false
+      ci: true
+      before-release: true
+  - tool-type: sast
+    tool-name: CodeQL
+    tool-version: latest
+    integration:
+      ad-hoc: false
+      ci: true
+      before-release: true
+vulnerability-reporting:
+  accepts-vulnerability-reports: true
+  security-policy: https://github.com/prometheus/prometheus/security/policy

VERSION

@@ -1 +1 @@
-2.53.0
+2.53.1

cmd/promtool/main.go

@@ -204,6 +204,7 @@ func main() {
 	pushMetricsHeaders := pushMetricsCmd.Flag("header", "Prometheus remote write header.").StringMap()
 
 	testCmd := app.Command("test", "Unit testing.")
+	junitOutFile := testCmd.Flag("junit", "File path to store JUnit XML test results.").OpenFile(os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o644)
 	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(
@@ -378,7 +379,11 @@ func main() {
 		os.Exit(QueryLabels(serverURL, httpRoundTripper, *queryLabelsMatch, *queryLabelsName, *queryLabelsBegin, *queryLabelsEnd, p))
 
 	case testRulesCmd.FullCommand():
-		os.Exit(RulesUnitTest(
+		results := io.Discard
+		if *junitOutFile != nil {
+			results = *junitOutFile
+		}
+		os.Exit(RulesUnitTestResult(results,
 			promqltest.LazyLoaderOpts{
 				EnableAtModifier:     true,
 				EnableNegativeOffset: true,

cmd/promtool/metrics.go

@@ -101,6 +101,7 @@ func PushMetrics(url *url.URL, roundTripper http.RoundTripper, headers map[strin
 	return successExitCode
 }
 
+// TODO(bwplotka): Add PRW 2.0 support.
 func parseAndPushMetrics(client *remote.Client, data []byte, labels map[string]string) bool {
 	metricsData, err := fmtutil.MetricTextToWriteRequest(bytes.NewReader(data), labels)
 	if err != nil {
@@ -116,7 +117,7 @@ func parseAndPushMetrics(client *remote.Client, data []byte, labels map[string]s
 
 	// Encode the request body into snappy encoding.
 	compressed := snappy.Encode(nil, raw)
-	err = client.Store(context.Background(), compressed, 0)
+	_, err = client.Store(context.Background(), compressed, 0)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "  FAILED:", err)
 		return false

cmd/promtool/unittest.go

@@ -18,6 +18,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 	"sort"
@@ -29,9 +30,10 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/grafana/regexp"
 	"github.com/nsf/jsondiff"
-	"github.com/prometheus/common/model"
 	"gopkg.in/yaml.v2"
 
+	"github.com/prometheus/common/model"
+
 	"github.com/prometheus/prometheus/model/histogram"
 	"github.com/prometheus/prometheus/model/labels"
 	"github.com/prometheus/prometheus/promql"
@@ -39,12 +41,18 @@ import (
 	"github.com/prometheus/prometheus/promql/promqltest"
 	"github.com/prometheus/prometheus/rules"
 	"github.com/prometheus/prometheus/storage"
+	"github.com/prometheus/prometheus/util/junitxml"
 )
 
 // 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 promqltest.LazyLoaderOpts, runStrings []string, diffFlag bool, files ...string) int {
+	return RulesUnitTestResult(io.Discard, queryOpts, runStrings, diffFlag, files...)
+}
+
+func RulesUnitTestResult(results io.Writer, queryOpts promqltest.LazyLoaderOpts, runStrings []string, diffFlag bool, files ...string) int {
 	failed := false
+	junit := &junitxml.JUnitXML{}
 
 	var run *regexp.Regexp
 	if runStrings != nil {
@@ -52,7 +60,7 @@ func RulesUnitTest(queryOpts promqltest.LazyLoaderOpts, runStrings []string, dif
 	}
 
 	for _, f := range files {
-		if errs := ruleUnitTest(f, queryOpts, run, diffFlag); errs != nil {
+		if errs := ruleUnitTest(f, queryOpts, run, diffFlag, junit.Suite(f)); errs != nil {
 			fmt.Fprintln(os.Stderr, "  FAILED:")
 			for _, e := range errs {
 				fmt.Fprintln(os.Stderr, e.Error())
@@ -64,25 +72,30 @@ func RulesUnitTest(queryOpts promqltest.LazyLoaderOpts, runStrings []string, dif
 		}
 		fmt.Println()
 	}
+	err := junit.WriteXML(results)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to write JUnit XML: %s\n", err)
+	}
 	if failed {
 		return failureExitCode
 	}
 	return successExitCode
 }
 
-func ruleUnitTest(filename string, queryOpts promqltest.LazyLoaderOpts, run *regexp.Regexp, diffFlag bool) []error {
-	fmt.Println("Unit Testing: ", filename)
-
+func ruleUnitTest(filename string, queryOpts promqltest.LazyLoaderOpts, run *regexp.Regexp, diffFlag bool, ts *junitxml.TestSuite) []error {
 	b, err := os.ReadFile(filename)
 	if err != nil {
+		ts.Abort(err)
 		return []error{err}
 	}
 
 	var unitTestInp unitTestFile
 	if err := yaml.UnmarshalStrict(b, &unitTestInp); err != nil {
+		ts.Abort(err)
 		return []error{err}
 	}
 	if err := resolveAndGlobFilepaths(filepath.Dir(filename), &unitTestInp); err != nil {
+		ts.Abort(err)
 		return []error{err}
 	}
 
@@ -91,29 +104,38 @@ func ruleUnitTest(filename string, queryOpts promqltest.LazyLoaderOpts, run *reg
 	}
 
 	evalInterval := time.Duration(unitTestInp.EvaluationInterval)
-
+	ts.Settime(time.Now().Format("2006-01-02T15:04:05"))
 	// Giving number for groups mentioned in the file for ordering.
 	// Lower number group should be evaluated before higher number group.
 	groupOrderMap := make(map[string]int)
 	for i, gn := range unitTestInp.GroupEvalOrder {
 		if _, ok := groupOrderMap[gn]; ok {
-			return []error{fmt.Errorf("group name repeated in evaluation order: %s", gn)}
+			err := fmt.Errorf("group name repeated in evaluation order: %s", gn)
+			ts.Abort(err)
+			return []error{err}
 		}
 		groupOrderMap[gn] = i
 	}
 
 	// Testing.
 	var errs []error
-	for _, t := range unitTestInp.Tests {
+	for i, t := range unitTestInp.Tests {
 		if !matchesRun(t.TestGroupName, run) {
 			continue
 		}
-
+		testname := t.TestGroupName
+		if testname == "" {
+			testname = fmt.Sprintf("unnamed#%d", i)
+		}
+		tc := ts.Case(testname)
 		if t.Interval == 0 {
 			t.Interval = unitTestInp.EvaluationInterval
 		}
 		ers := t.test(evalInterval, groupOrderMap, queryOpts, diffFlag, unitTestInp.RuleFiles...)
 		if ers != nil {
+			for _, e := range ers {
+				tc.Fail(e.Error())
+			}
 			errs = append(errs, ers...)
 		}
 	}

cmd/promtool/unittest_test.go

@@ -14,11 +14,15 @@
 package main
 
 import (
+	"bytes"
+	"encoding/xml"
+	"fmt"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 
 	"github.com/prometheus/prometheus/promql/promqltest"
+	"github.com/prometheus/prometheus/util/junitxml"
 )
 
 func TestRulesUnitTest(t *testing.T) {
@@ -125,13 +129,59 @@ func TestRulesUnitTest(t *testing.T) {
 			want: 0,
 		},
 	}
+	reuseFiles := []string{}
+	reuseCount := [2]int{}
 	for _, tt := range tests {
+		if (tt.queryOpts == promqltest.LazyLoaderOpts{
+			EnableNegativeOffset: true,
+		} || tt.queryOpts == promqltest.LazyLoaderOpts{
+			EnableAtModifier: true,
+		}) {
+			reuseFiles = append(reuseFiles, tt.args.files...)
+			reuseCount[tt.want] += len(tt.args.files)
+		}
 		t.Run(tt.name, func(t *testing.T) {
 			if got := RulesUnitTest(tt.queryOpts, nil, false, tt.args.files...); got != tt.want {
 				t.Errorf("RulesUnitTest() = %v, want %v", got, tt.want)
 			}
 		})
 	}
+	t.Run("Junit xml output ", func(t *testing.T) {
+		var buf bytes.Buffer
+		if got := RulesUnitTestResult(&buf, promqltest.LazyLoaderOpts{}, nil, false, reuseFiles...); got != 1 {
+			t.Errorf("RulesUnitTestResults() = %v, want 1", got)
+		}
+		var test junitxml.JUnitXML
+		output := buf.Bytes()
+		err := xml.Unmarshal(output, &test)
+		if err != nil {
+			fmt.Println("error in decoding XML:", err)
+			return
+		}
+		var total int
+		var passes int
+		var failures int
+		var cases int
+		total = len(test.Suites)
+		if total != len(reuseFiles) {
+			t.Errorf("JUnit output had %d testsuite elements; expected %d\n", total, len(reuseFiles))
+		}
+
+		for _, i := range test.Suites {
+			if i.FailureCount == 0 {
+				passes++
+			} else {
+				failures++
+			}
+			cases += len(i.Cases)
+		}
+		if total != passes+failures {
+			t.Errorf("JUnit output mismatch: Total testsuites (%d) does not equal the sum of passes (%d) and failures (%d).", total, passes, failures)
+		}
+		if cases < total {
+			t.Errorf("JUnit output had %d suites without test cases\n", total-cases)
+		}
+	})
 }
 
 func TestRulesUnitTestRun(t *testing.T) {

config/config.go

@@ -37,6 +37,7 @@ import (
 	"github.com/prometheus/prometheus/model/labels"
 	"github.com/prometheus/prometheus/model/relabel"
 	"github.com/prometheus/prometheus/storage/remote/azuread"
+	"github.com/prometheus/prometheus/storage/remote/googleiam"
 )
 
 var (
@@ -227,6 +228,9 @@ var (
 	DefaultExemplarsConfig = ExemplarsConfig{
 		MaxExemplars: 100000,
 	}
+
+	// DefaultOTLPConfig is the default OTLP configuration.
+	DefaultOTLPConfig = OTLPConfig{}
 )
 
 // Config is the top-level configuration for Prometheus's config files.
@@ -242,6 +246,7 @@ type Config struct {
 
 	RemoteWriteConfigs []*RemoteWriteConfig `yaml:"remote_write,omitempty"`
 	RemoteReadConfigs  []*RemoteReadConfig  `yaml:"remote_read,omitempty"`
+	OTLPConfig         OTLPConfig           `yaml:"otlp,omitempty"`
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -1119,6 +1124,7 @@ type RemoteWriteConfig struct {
 	MetadataConfig   MetadataConfig          `yaml:"metadata_config,omitempty"`
 	SigV4Config      *sigv4.SigV4Config      `yaml:"sigv4,omitempty"`
 	AzureADConfig    *azuread.AzureADConfig  `yaml:"azuread,omitempty"`
+	GoogleIAMConfig  *googleiam.Config       `yaml:"google_iam,omitempty"`
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -1156,17 +1162,33 @@ func (c *RemoteWriteConfig) UnmarshalYAML(unmarshal func(interface{}) error) err
 		return err
 	}
 
-	httpClientConfigAuthEnabled := c.HTTPClientConfig.BasicAuth != nil ||
-		c.HTTPClientConfig.Authorization != nil || c.HTTPClientConfig.OAuth2 != nil
+	return validateAuthConfigs(c)
+}
 
-	if httpClientConfigAuthEnabled && (c.SigV4Config != nil || c.AzureADConfig != nil) {
-		return fmt.Errorf("at most one of basic_auth, authorization, oauth2, sigv4, & azuread must be configured")
+// validateAuthConfigs validates that at most one of basic_auth, authorization, oauth2, sigv4, azuread or google_iam must be configured.
+func validateAuthConfigs(c *RemoteWriteConfig) error {
+	var authConfigured []string
+	if c.HTTPClientConfig.BasicAuth != nil {
+		authConfigured = append(authConfigured, "basic_auth")
 	}
-
-	if c.SigV4Config != nil && c.AzureADConfig != nil {
-		return fmt.Errorf("at most one of basic_auth, authorization, oauth2, sigv4, & azuread must be configured")
+	if c.HTTPClientConfig.Authorization != nil {
+		authConfigured = append(authConfigured, "authorization")
+	}
+	if c.HTTPClientConfig.OAuth2 != nil {
+		authConfigured = append(authConfigured, "oauth2")
+	}
+	if c.SigV4Config != nil {
+		authConfigured = append(authConfigured, "sigv4")
+	}
+	if c.AzureADConfig != nil {
+		authConfigured = append(authConfigured, "azuread")
+	}
+	if c.GoogleIAMConfig != nil {
+		authConfigured = append(authConfigured, "google_iam")
+	}
+	if len(authConfigured) > 1 {
+		return fmt.Errorf("at most one of basic_auth, authorization, oauth2, sigv4, azuread or google_iam must be configured. Currently configured: %v", authConfigured)
 	}
-
 	return nil
 }
 
@@ -1185,7 +1207,7 @@ 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, sigv4, or azuread parameter")
+			return errors.New("authorization header must be changed via the basic_auth, authorization, oauth2, sigv4, azuread or google_iam parameter")
 		}
 		if _, ok := reservedHeaders[strings.ToLower(header)]; ok {
 			return fmt.Errorf("%s is a reserved header. It must not be changed", header)
@@ -1304,3 +1326,35 @@ func getGoGCEnv() int {
 	}
 	return DefaultRuntimeConfig.GoGC
 }
+
+// OTLPConfig is the configuration for writing to the OTLP endpoint.
+type OTLPConfig struct {
+	PromoteResourceAttributes []string `yaml:"promote_resource_attributes,omitempty"`
+}
+
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
+func (c *OTLPConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	*c = DefaultOTLPConfig
+	type plain OTLPConfig
+	if err := unmarshal((*plain)(c)); err != nil {
+		return err
+	}
+
+	seen := map[string]struct{}{}
+	var err error
+	for i, attr := range c.PromoteResourceAttributes {
+		attr = strings.TrimSpace(attr)
+		if attr == "" {
+			err = errors.Join(err, fmt.Errorf("empty promoted OTel resource attribute"))
+			continue
+		}
+		if _, exists := seen[attr]; exists {
+			err = errors.Join(err, fmt.Errorf("duplicated promoted OTel resource attribute %q", attr))
+			continue
+		}
+
+		seen[attr] = struct{}{}
+		c.PromoteResourceAttributes[i] = attr
+	}
+	return err
+}

config/config_test.go

@@ -156,6 +156,12 @@ var expectedConf = &Config{
 		},
 	},
 
+	OTLPConfig: OTLPConfig{
+		PromoteResourceAttributes: []string{
+			"k8s.cluster.name", "k8s.job.name", "k8s.namespace.name",
+		},
+	},
+
 	RemoteReadConfigs: []*RemoteReadConfig{
 		{
 			URL:           mustParseURL("http://remote1/read"),
@@ -1471,6 +1477,26 @@ func TestRemoteWriteRetryOnRateLimit(t *testing.T) {
 	require.False(t, got.RemoteWriteConfigs[1].QueueConfig.RetryOnRateLimit)
 }
 
+func TestOTLPSanitizeResourceAttributes(t *testing.T) {
+	t.Run("good config", func(t *testing.T) {
+		want, err := LoadFile(filepath.Join("testdata", "otlp_sanitize_resource_attributes.good.yml"), false, false, log.NewNopLogger())
+		require.NoError(t, err)
+
+		out, err := yaml.Marshal(want)
+		require.NoError(t, err)
+		var got Config
+		require.NoError(t, yaml.UnmarshalStrict(out, &got))
+
+		require.Equal(t, []string{"k8s.cluster.name", "k8s.job.name", "k8s.namespace.name"}, got.OTLPConfig.PromoteResourceAttributes)
+	})
+
+	t.Run("bad config", func(t *testing.T) {
+		_, err := LoadFile(filepath.Join("testdata", "otlp_sanitize_resource_attributes.bad.yml"), false, false, log.NewNopLogger())
+		require.ErrorContains(t, err, `duplicated promoted OTel resource attribute "k8s.job.name"`)
+		require.ErrorContains(t, err, `empty promoted OTel resource attribute`)
+	})
+}
+
 func TestLoadConfig(t *testing.T) {
 	// Parse a valid file that sets a global scrape timeout. This tests whether parsing
 	// an overwritten default field in the global config permanently changes the default.
@@ -1800,7 +1826,7 @@ var expectedErrors = []struct {
 	},
 	{
 		filename: "remote_write_authorization_header.bad.yml",
-		errMsg:   `authorization header must be changed via the basic_auth, authorization, oauth2, sigv4, or azuread parameter`,
+		errMsg:   `authorization header must be changed via the basic_auth, authorization, oauth2, sigv4, azuread or google_iam parameter`,
 	},
 	{
 		filename: "remote_write_wrong_msg.bad.yml",

config/testdata/conf.good.yml

@@ -45,6 +45,9 @@ remote_write:
     headers:
       name: value
 
+otlp:
+  promote_resource_attributes: ["k8s.cluster.name", "k8s.job.name", "k8s.namespace.name"]
+
 remote_read:
   - url: http://remote1/read
     read_recent: true

config/testdata/otlp_sanitize_resource_attributes.bad.yml

@@ -0,0 +1,2 @@
+otlp:
+  promote_resource_attributes: ["k8s.cluster.name", " k8s.job.name ", "k8s.namespace.name", "k8s.job.name", ""]

config/testdata/otlp_sanitize_resource_attributes.good.yml

@@ -0,0 +1,2 @@
+otlp:
+  promote_resource_attributes: ["k8s.cluster.name", " k8s.job.name ", "k8s.namespace.name"]

discovery/legacymanager/manager_test.go

@@ -1090,7 +1090,6 @@ func TestCoordinationWithReceiver(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		tc := tc
 		t.Run(tc.title, func(t *testing.T) {
 			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 			defer cancel()

discovery/moby/network.go

@@ -17,7 +17,7 @@ import (
 	"context"
 	"strconv"
 
-	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/network"
 	"github.com/docker/docker/client"
 
 	"github.com/prometheus/prometheus/util/strutil"
@@ -34,7 +34,7 @@ const (
 )
 
 func getNetworksLabels(ctx context.Context, client *client.Client, labelPrefix string) (map[string]map[string]string, error) {
-	networks, err := client.NetworkList(ctx, types.NetworkListOptions{})
+	networks, err := client.NetworkList(ctx, network.ListOptions{})
 	if err != nil {
 		return nil, err
 	}

docs/command-line/prometheus.md

@@ -30,7 +30,7 @@ The Prometheus monitoring server
 | <code class="text-nowrap">--web.console.templates</code> | Path to the console template directory, available at /consoles. | `consoles` |
 | <code class="text-nowrap">--web.console.libraries</code> | Path to the console library directory. | `console_libraries` |
 | <code class="text-nowrap">--web.page-title</code> | Document title of Prometheus instance. | `Prometheus Time Series Collection and Processing Server` |
-| <code class="text-nowrap">--web.cors.origin</code> | Regex for CORS origin. It is fully anchored. Example: 'https?://(domain1|domain2)\.com' | `.*` |
+| <code class="text-nowrap">--web.cors.origin</code> | Regex for CORS origin. It is fully anchored. Example: 'https?://(domain1\|domain2)\.com' | `.*` |
 | <code class="text-nowrap">--storage.tsdb.path</code> | Base path for metrics storage. Use with server mode only. | `data/` |
 | <code class="text-nowrap">--storage.tsdb.retention</code> | [DEPRECATED] How long to retain samples in storage. This flag has been deprecated, use "storage.tsdb.retention.time" instead. Use with server mode only. |  |
 | <code class="text-nowrap">--storage.tsdb.retention.time</code> | How long to retain samples in storage. When this flag is set it overrides "storage.tsdb.retention". If neither this flag nor "storage.tsdb.retention" nor "storage.tsdb.retention.size" is set, the retention time defaults to 15d. Units Supported: y, w, d, h, m, s, ms. Use with server mode only. |  |

docs/command-line/promtool.md

@@ -442,6 +442,15 @@ Unit testing.
 
 
 
+#### Flags
+
+| Flag | Description |
+| --- | --- |
+| <code class="text-nowrap">--junit</code> | File path to store JUnit XML test results. |
+
+
+
+
 ##### `promtool test rules`
 
 Unit tests for rules.

docs/configuration/configuration.md

@@ -152,6 +152,10 @@ alerting:
 remote_write:
   [ - <remote_write> ... ]
 
+# Settings related to the OTLP receiver feature.
+otlp:
+  [ promote_resource_attributes: [<string>, ...] | default = [ ] ]
+
 # Settings related to the remote read feature.
 remote_read:
   [ - <remote_read> ... ]
@@ -458,13 +462,15 @@ metric_relabel_configs:
 [ keep_dropped_targets: <int> | default = 0 ]
 
 # Limit on total number of positive and negative buckets allowed in a single
-# native histogram. If this is exceeded, the entire scrape will be treated as
-# failed. 0 means no limit.
+# native histogram. The resolution of a histogram with more buckets will be
+# reduced until the number of buckets is within the limit. If the limit cannot
+# be reached, the scrape will fail.
+# 0 means no limit.
 [ native_histogram_bucket_limit: <int> | default = 0 ]
 
 # Lower limit for the growth factor of one bucket to the next in each native
 # histogram. The resolution of a histogram with a lower growth factor will be
-# reduced until it is within the limit.
+# reduced as much as possible until it is within the limit.
 # To set an upper limit for the schema (equivalent to "scale" in OTel's
 # exponential histograms), use the following factor limits:
 # 
@@ -3395,8 +3401,8 @@ authorization:
   # It is mutually exclusive with `credentials`.
   [ credentials_file: <filename> ]
 
-# Optionally configures AWS's Signature Verification 4 signing process to
-# sign requests. Cannot be set at the same time as basic_auth, authorization, or oauth2.
+# Optionally configures AWS's Signature Verification 4 signing process to sign requests.
+# Cannot be set at the same time as basic_auth, authorization, oauth2, azuread or google_iam.
 # To use the default credentials from the AWS SDK, use `sigv4: {}`.
 sigv4:
   # The AWS region. If blank, the region from the default credentials chain
@@ -3649,12 +3655,12 @@ sigv4:
   [ role_arn: <string> ]
 
 # Optional OAuth 2.0 configuration.
-# Cannot be used at the same time as basic_auth, authorization, sigv4, or azuread.
+# Cannot be used at the same time as basic_auth, authorization, sigv4, azuread or google_iam.
 oauth2:
   [ <oauth2> ]
 
 # Optional AzureAD configuration.
-# Cannot be used at the same time as basic_auth, authorization, oauth2, or sigv4.
+# Cannot be used at the same time as basic_auth, authorization, oauth2, sigv4 or google_iam.
 azuread:
   # The Azure Cloud. Options are 'AzurePublic', 'AzureChina', or 'AzureGovernment'.
   [ cloud: <string> | default = AzurePublic ]
@@ -3674,6 +3680,14 @@ azuread:
   [ sdk:
       [ tenant_id: <string> ] ]
 
+# WARNING: Remote write is NOT SUPPORTED by Google Cloud. This configuration is reserved for future use.
+# Optional Google Cloud Monitoring configuration.
+# Cannot be used at the same time as basic_auth, authorization, oauth2, sigv4 or azuread.
+# To use the default credentials from the Google Cloud SDK, use `google_iam: {}`.
+google_iam:
+  # Service account key with monitoring write permessions.
+  credentials_file: <file_name>
+
 # Configures the remote write request's TLS settings.
 tls_config:
   [ <tls_config> ]

docs/configuration/unit_testing_rules.md

@@ -92,7 +92,7 @@ series: <string>
 #
 # Native histogram notation:
 #     Native histograms can be used instead of floating point numbers using the following notation:
-#     {{schema:1 sum:-0.3 count:3.1 z_bucket:7.1 z_bucket_w:0.05 buckets:[5.1 10 7] offset:-3 n_buckets:[4.1 5] n_offset:-5}}
+#     {{schema:1 sum:-0.3 count:3.1 z_bucket:7.1 z_bucket_w:0.05 buckets:[5.1 10 7] offset:-3 n_buckets:[4.1 5] n_offset:-5 counter_reset_hint:gauge}}
 #     Native histograms support the same expanding notation as floating point numbers, i.e. 'axn', 'a+bxn' and 'a-bxn'.
 #     All properties are optional and default to 0. The order is not important. The following properties are supported:
 #     - schema (int): 
@@ -119,6 +119,8 @@ series: <string>
 #         Observation counts in negative buckets. Each represents an absolute count.
 #     - n_offset (int):
 #         The starting index of the first entry in the negative buckets.
+#     - counter_reset_hint (one of 'unknown', 'reset', 'not_reset' or 'gauge')
+#         The counter reset hint associated with this histogram. Defaults to 'unknown' if not set.
 values: <string>
 ```
 

docs/querying/api.md

@@ -260,7 +260,7 @@ URL query parameters:
   series to return. At least one `match[]` argument must be provided.
 - `start=<rfc3339 | unix_timestamp>`: Start timestamp.
 - `end=<rfc3339 | unix_timestamp>`: End timestamp.
-- `limit=<number>`: Maximum number of returned series. Optional.
+- `limit=<number>`: Maximum number of returned series. Optional. 0 means disabled.
 
 You can URL-encode these parameters directly in the request body by using the `POST` method and
 `Content-Type: application/x-www-form-urlencoded` header. This is useful when specifying a large
@@ -311,7 +311,7 @@ URL query parameters:
 - `end=<rfc3339 | unix_timestamp>`: End timestamp. Optional.
 - `match[]=<series_selector>`: Repeated series selector argument that selects the
   series from which to read the label names. Optional.
-- `limit=<number>`: Maximum number of returned series. Optional.
+- `limit=<number>`: Maximum number of returned series. Optional. 0 means disabled.
 
 
 The `data` section of the JSON response is a list of string label names.
@@ -362,7 +362,7 @@ URL query parameters:
 - `end=<rfc3339 | unix_timestamp>`: End timestamp. Optional.
 - `match[]=<series_selector>`: Repeated series selector argument that selects the
   series from which to read the label values. Optional.
-- `limit=<number>`: Maximum number of returned series. Optional.
+- `limit=<number>`: Maximum number of returned series. Optional. 0 means disabled.
 
 
 The `data` section of the JSON response is a list of string label values.

docs/querying/basics.md

@@ -8,9 +8,15 @@ sort_rank: 1
 
 Prometheus provides a functional query language called PromQL (Prometheus Query
 Language) that lets the user select and aggregate time series data in real
-time. The result of an expression can either be shown as a graph, viewed as
-tabular data in Prometheus's expression browser, or consumed by external
-systems via the [HTTP API](api.md).
+time. 
+
+When you send a query request to Prometheus, it can be an _instant query_, evaluated at one point in time,
+or a _range query_ at equally-spaced steps between a start and an end time. PromQL works exactly the same
+in each cases; the range query is just like an instant query run multiple times at different timestamps.
+
+In the Prometheus UI, the "Table" tab is for instant queries and the "Graph" tab is for range queries.
+
+Other programs can fetch the result of a PromQL expression via the [HTTP API](api.md).
 
 ## Examples
 
@@ -82,11 +88,19 @@ Examples:
     -Inf
     NaN
 	
+
+As of version 2.54, float literals can also be represented using the syntax of time durations, where the time duration is converted into a float value corresponding to the number of seconds the time duration represents. This is an experimental feature and might still change.
+
+Examples:
+
+    1s # Equivalent to 1.0
+    2m # Equivalent to 120.0
+    1ms # Equivalent to 0.001
+ 
+
 ## Time series selectors
 
-Time series selectors are responsible for selecting the times series and raw or inferred sample timestamps and values.
-
-Time series *selectors* are not to be confused with higher level concept of instant and range *queries* that can execute the time series *selectors*. A higher level instant query would evaluate the given selector at one point in time, however the range query would evaluate the selector at multiple different times in between a minimum and maximum timestamp at regular steps.
+These are the basic building-blocks that instruct PromQL what data to fetch.
 
 ### Instant vector selectors
 
@@ -224,6 +238,15 @@ Here are some examples of valid time durations:
     5m
     10s
 
+
+As of version 2.54, time durations can also be represented using the syntax of float literals, implying the number of seconds of the time duration. This is an experimental feature and might still change.
+
+Examples:
+
+    1.0 # Equivalent to 1s
+    0.001 # Equivalent to 1ms
+    120 # Equivalent to 2m
+
 ### Offset modifier
 
 The `offset` modifier allows changing the time offset for individual

docs/querying/functions.md

@@ -98,8 +98,9 @@ vector.
 clamps the sample values of all elements in `v` to have a lower limit of `min` and an upper limit of `max`.
 
 Special cases:
-- Return an empty vector if `min > max`
-- Return `NaN` if `min` or `max` is `NaN`
+
+* Return an empty vector if `min > max`
+* Return `NaN` if `min` or `max` is `NaN`
 
 ## `clamp_max()`
 
@@ -349,8 +350,8 @@ a histogram.
 
 Buckets of classic histograms are cumulative. Therefore, the following should always be the case:
 
-- The counts in the buckets are monotonically increasing (strictly non-decreasing).
-- A lack of observations between the upper limits of two consecutive buckets results in equal counts
+* The counts in the buckets are monotonically increasing (strictly non-decreasing).
+* A lack of observations between the upper limits of two consecutive buckets results in equal counts
 in those two buckets.
 
 However, floating point precision issues (e.g. small discrepancies introduced by computing of buckets
@@ -692,21 +693,21 @@ ignore histogram samples.
 
 The trigonometric functions work in radians:
 
-- `acos(v instant-vector)`: calculates the arccosine of all elements in `v` ([special cases](https://pkg.go.dev/math#Acos)).
-- `acosh(v instant-vector)`: calculates the inverse hyperbolic cosine of all elements in `v` ([special cases](https://pkg.go.dev/math#Acosh)).
-- `asin(v instant-vector)`: calculates the arcsine of all elements in `v` ([special cases](https://pkg.go.dev/math#Asin)).
-- `asinh(v instant-vector)`: calculates the inverse hyperbolic sine of all elements in `v` ([special cases](https://pkg.go.dev/math#Asinh)).
-- `atan(v instant-vector)`: calculates the arctangent of all elements in `v` ([special cases](https://pkg.go.dev/math#Atan)).
-- `atanh(v instant-vector)`: calculates the inverse hyperbolic tangent of all elements in `v` ([special cases](https://pkg.go.dev/math#Atanh)).
-- `cos(v instant-vector)`: calculates the cosine of all elements in `v` ([special cases](https://pkg.go.dev/math#Cos)).
-- `cosh(v instant-vector)`: calculates the hyperbolic cosine of all elements in `v` ([special cases](https://pkg.go.dev/math#Cosh)).
-- `sin(v instant-vector)`: calculates the sine of all elements in `v` ([special cases](https://pkg.go.dev/math#Sin)).
-- `sinh(v instant-vector)`: calculates the hyperbolic sine of all elements in `v` ([special cases](https://pkg.go.dev/math#Sinh)).
-- `tan(v instant-vector)`: calculates the tangent of all elements in `v` ([special cases](https://pkg.go.dev/math#Tan)).
-- `tanh(v instant-vector)`: calculates the hyperbolic tangent of all elements in `v` ([special cases](https://pkg.go.dev/math#Tanh)).
+* `acos(v instant-vector)`: calculates the arccosine of all elements in `v` ([special cases](https://pkg.go.dev/math#Acos)).
+* `acosh(v instant-vector)`: calculates the inverse hyperbolic cosine of all elements in `v` ([special cases](https://pkg.go.dev/math#Acosh)).
+* `asin(v instant-vector)`: calculates the arcsine of all elements in `v` ([special cases](https://pkg.go.dev/math#Asin)).
+* `asinh(v instant-vector)`: calculates the inverse hyperbolic sine of all elements in `v` ([special cases](https://pkg.go.dev/math#Asinh)).
+* `atan(v instant-vector)`: calculates the arctangent of all elements in `v` ([special cases](https://pkg.go.dev/math#Atan)).
+* `atanh(v instant-vector)`: calculates the inverse hyperbolic tangent of all elements in `v` ([special cases](https://pkg.go.dev/math#Atanh)).
+* `cos(v instant-vector)`: calculates the cosine of all elements in `v` ([special cases](https://pkg.go.dev/math#Cos)).
+* `cosh(v instant-vector)`: calculates the hyperbolic cosine of all elements in `v` ([special cases](https://pkg.go.dev/math#Cosh)).
+* `sin(v instant-vector)`: calculates the sine of all elements in `v` ([special cases](https://pkg.go.dev/math#Sin)).
+* `sinh(v instant-vector)`: calculates the hyperbolic sine of all elements in `v` ([special cases](https://pkg.go.dev/math#Sinh)).
+* `tan(v instant-vector)`: calculates the tangent of all elements in `v` ([special cases](https://pkg.go.dev/math#Tan)).
+* `tanh(v instant-vector)`: calculates the hyperbolic tangent of all elements in `v` ([special cases](https://pkg.go.dev/math#Tanh)).
 
 The following are useful for converting between degrees and radians:
 
-- `deg(v instant-vector)`: converts radians to degrees for all elements in `v`.
-- `pi()`: returns pi.
-- `rad(v instant-vector)`: converts degrees to radians for all elements in `v`.
+* `deg(v instant-vector)`: converts radians to degrees for all elements in `v`.
+* `pi()`: returns pi.
+* `rad(v instant-vector)`: converts degrees to radians for all elements in `v`.

docs/storage.md

@@ -137,6 +137,18 @@ will be used.
 Expired block cleanup happens in the background. It may take up to two hours
 to remove expired blocks. Blocks must be fully expired before they are removed.
 
+## Right-Sizing Retention Size
+
+If you are utilizing `storage.tsdb.retention.size` to set a size limit, you 
+will want to consider the right size for this value relative to the storage you 
+have allocated for Prometheus. It is wise to reduce the retention size to provide 
+a buffer, ensuring that older entries will be removed before the allocated storage 
+for Prometheus becomes full.
+
+At present, we recommend setting the retention size to, at most, 80-85% of your 
+allocated Prometheus disk space. This increases the likelihood that older entires 
+will be removed prior to hitting any disk limitations.
+
 ## Remote storage integrations
 
 Prometheus's local storage is limited to a single node's scalability and durability.

documentation/examples/remote_storage/go.mod

@@ -1,6 +1,6 @@
 module github.com/prometheus/prometheus/documentation/examples/remote_storage
 
-go 1.21
+go 1.21.0
 
 require (
 	github.com/alecthomas/kingpin/v2 v2.4.0
@@ -10,7 +10,7 @@ require (
 	github.com/influxdata/influxdb v1.11.5
 	github.com/prometheus/client_golang v1.19.1
 	github.com/prometheus/common v0.55.0
-	github.com/prometheus/prometheus v0.52.1
+	github.com/prometheus/prometheus v0.53.1
 	github.com/stretchr/testify v1.9.0
 )
 

go.mod

@@ -1,22 +1,24 @@
 module github.com/prometheus/prometheus
 
-go 1.21
+go 1.21.0
+
+toolchain go1.22.5
 
 require (
-	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.11.1
-	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.5.2
+	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.13.0
+	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.7.0
 	github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v5 v5.7.0
 	github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork/v4 v4.3.0
 	github.com/Code-Hex/go-generics-cache v1.5.1
 	github.com/KimMachineGun/automemlimit v0.6.1
 	github.com/alecthomas/kingpin/v2 v2.4.0
-	github.com/alecthomas/units v0.0.0-20231202071711-9a357b53e9c9
-	github.com/aws/aws-sdk-go v1.53.16
+	github.com/alecthomas/units v0.0.0-20240626203959-61d1e3462e30
+	github.com/aws/aws-sdk-go v1.54.19
 	github.com/bboreham/go-loser v0.0.0-20230920113527-fcc2c21820a3
 	github.com/cespare/xxhash/v2 v2.3.0
 	github.com/dennwc/varint v1.0.0
-	github.com/digitalocean/godo v1.117.0
-	github.com/docker/docker v26.1.3+incompatible
+	github.com/digitalocean/godo v1.119.0
+	github.com/docker/docker v27.0.3+incompatible
 	github.com/edsrzf/mmap-go v1.1.0
 	github.com/envoyproxy/go-control-plane v0.12.0
 	github.com/envoyproxy/protoc-gen-validate v1.0.4
@@ -29,75 +31,75 @@ require (
 	github.com/gogo/protobuf v1.3.2
 	github.com/golang/snappy v0.0.4
 	github.com/google/go-cmp v0.6.0
-	github.com/google/pprof v0.0.0-20240528025155-186aa0362fba
+	github.com/google/pprof v0.0.0-20240711041743-f6c9dda6c6da
 	github.com/google/uuid v1.6.0
-	github.com/gophercloud/gophercloud v1.12.0
+	github.com/gophercloud/gophercloud v1.14.0
 	github.com/grafana/regexp v0.0.0-20240518133315-a468a5bfb3bc
 	github.com/grpc-ecosystem/grpc-gateway v1.16.0
-	github.com/hashicorp/consul/api v1.29.1
-	github.com/hashicorp/nomad/api v0.0.0-20240604134157-e73d8bb1140d
-	github.com/hetznercloud/hcloud-go/v2 v2.9.0
+	github.com/hashicorp/consul/api v1.29.2
+	github.com/hashicorp/nomad/api v0.0.0-20240717122358-3d93bd3778f3
+	github.com/hetznercloud/hcloud-go/v2 v2.12.0
 	github.com/ionos-cloud/sdk-go/v6 v6.1.11
 	github.com/json-iterator/go v1.1.12
-	github.com/klauspost/compress v1.17.8
+	github.com/klauspost/compress v1.17.9
 	github.com/kolo/xmlrpc v0.0.0-20220921171641-a4b6fa1dd06b
-	github.com/linode/linodego v1.35.0
-	github.com/miekg/dns v1.1.59
+	github.com/linode/linodego v1.38.0
+	github.com/miekg/dns v1.1.61
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822
 	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f
 	github.com/nsf/jsondiff v0.0.0-20230430225905-43f6cf3098c1
 	github.com/oklog/run v1.1.0
 	github.com/oklog/ulid v1.3.1
-	github.com/ovh/go-ovh v1.5.1
+	github.com/ovh/go-ovh v1.6.0
 	github.com/prometheus/alertmanager v0.27.0
 	github.com/prometheus/client_golang v1.19.1
 	github.com/prometheus/client_model v0.6.1
-	github.com/prometheus/common v0.54.0
+	github.com/prometheus/common v0.55.0
 	github.com/prometheus/common/assets v0.2.0
 	github.com/prometheus/common/sigv4 v0.1.0
 	github.com/prometheus/exporter-toolkit v0.11.0
-	github.com/scaleway/scaleway-sdk-go v1.0.0-beta.27
+	github.com/scaleway/scaleway-sdk-go v1.0.0-beta.29
 	github.com/shurcooL/httpfs v0.0.0-20230704072500-f1e31cf0ba5c
 	github.com/stretchr/testify v1.9.0
 	github.com/vultr/govultr/v2 v2.17.2
-	go.opentelemetry.io/collector/pdata v1.8.0
-	go.opentelemetry.io/collector/semconv v0.101.0
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.52.0
-	go.opentelemetry.io/otel v1.27.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.27.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.27.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.27.0
-	go.opentelemetry.io/otel/sdk v1.27.0
-	go.opentelemetry.io/otel/trace v1.27.0
+	go.opentelemetry.io/collector/pdata v1.12.0
+	go.opentelemetry.io/collector/semconv v0.105.0
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.53.0
+	go.opentelemetry.io/otel v1.28.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.28.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.28.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.28.0
+	go.opentelemetry.io/otel/sdk v1.28.0
+	go.opentelemetry.io/otel/trace v1.28.0
 	go.uber.org/atomic v1.11.0
 	go.uber.org/automaxprocs v1.5.3
 	go.uber.org/goleak v1.3.0
 	go.uber.org/multierr v1.11.0
-	golang.org/x/net v0.26.0
+	golang.org/x/net v0.27.0
 	golang.org/x/oauth2 v0.21.0
 	golang.org/x/sync v0.7.0
-	golang.org/x/sys v0.21.0
+	golang.org/x/sys v0.22.0
 	golang.org/x/text v0.16.0
 	golang.org/x/time v0.5.0
-	golang.org/x/tools v0.22.0
-	google.golang.org/api v0.183.0
-	google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157
-	google.golang.org/grpc v1.64.0
-	google.golang.org/protobuf v1.34.1
+	golang.org/x/tools v0.23.0
+	google.golang.org/api v0.189.0
+	google.golang.org/genproto/googleapis/api v0.0.0-20240711142825-46eb208f015d
+	google.golang.org/grpc v1.65.0
+	google.golang.org/protobuf v1.34.2
 	gopkg.in/yaml.v2 v2.4.0
 	gopkg.in/yaml.v3 v3.0.1
 	k8s.io/api v0.29.3
 	k8s.io/apimachinery v0.29.3
 	k8s.io/client-go v0.29.3
 	k8s.io/klog v1.0.0
-	k8s.io/klog/v2 v2.120.1
+	k8s.io/klog/v2 v2.130.1
 )
 
 require (
-	cloud.google.com/go/auth v0.5.1 // indirect
-	cloud.google.com/go/auth/oauth2adapt v0.2.2 // indirect
-	cloud.google.com/go/compute/metadata v0.3.0 // indirect
-	github.com/Azure/azure-sdk-for-go/sdk/internal v1.6.0 // indirect
+	cloud.google.com/go/auth v0.7.2 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.3 // indirect
+	cloud.google.com/go/compute/metadata v0.5.0 // indirect
+	github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0 // indirect
 	github.com/AzureAD/microsoft-authentication-library-for-go v1.2.2 // indirect
 	github.com/Microsoft/go-winio v0.6.1 // indirect
 	github.com/armon/go-metrics v0.4.1 // indirect
@@ -105,7 +107,7 @@ require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cilium/ebpf v0.11.0 // indirect
-	github.com/cncf/xds/go v0.0.0-20240318125728-8a4994d93e50 // indirect
+	github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b // indirect
 	github.com/containerd/cgroups/v3 v3.0.3 // indirect
 	github.com/containerd/log v0.1.0 // indirect
 	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
@@ -119,7 +121,7 @@ require (
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/ghodss/yaml v1.0.0 // indirect
 	github.com/go-kit/kit v0.12.0 // indirect
-	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-openapi/analysis v0.22.2 // indirect
 	github.com/go-openapi/errors v0.22.0 // indirect
@@ -132,7 +134,7 @@ require (
 	github.com/go-resty/resty/v2 v2.13.1 // indirect
 	github.com/godbus/dbus/v5 v5.0.4 // indirect
 	github.com/golang-jwt/jwt/v5 v5.2.1 // indirect
-	github.com/golang/glog v1.2.0 // indirect
+	github.com/golang/glog v1.2.1 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.4 // indirect
 	github.com/google/gnostic-models v0.6.8 // indirect
@@ -140,7 +142,7 @@ require (
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/google/s2a-go v0.1.7 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
-	github.com/googleapis/gax-go/v2 v2.12.4 // indirect
+	github.com/googleapis/gax-go/v2 v2.12.5 // indirect
 	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.20.0 // indirect
 	github.com/hashicorp/cronexpr v1.1.2 // indirect
@@ -176,20 +178,20 @@ require (
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
-	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/sirupsen/logrus v1.9.3 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/stretchr/objx v0.5.2 // indirect
 	github.com/xhit/go-str2duration/v2 v2.1.0 // indirect
 	go.mongodb.org/mongo-driver v1.14.0 // indirect
 	go.opencensus.io v0.24.0 // indirect
-	go.opentelemetry.io/otel/metric v1.27.0 // indirect
-	go.opentelemetry.io/proto/otlp v1.2.0 // indirect
-	golang.org/x/crypto v0.24.0 // indirect
+	go.opentelemetry.io/otel/metric v1.28.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.3.1 // indirect
+	golang.org/x/crypto v0.25.0 // indirect
 	golang.org/x/exp v0.0.0-20240119083558-1b970713d09a // indirect
-	golang.org/x/mod v0.18.0 // indirect
-	golang.org/x/term v0.21.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 // indirect
+	golang.org/x/mod v0.19.0 // indirect
+	golang.org/x/term v0.22.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240722135656-d784300faade // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gotest.tools/v3 v3.0.3 // indirect

go.sum

@@ -12,18 +12,18 @@ cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bP
 cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
 cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
 cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go/auth v0.5.1 h1:0QNO7VThG54LUzKiQxv8C6x1YX7lUrzlAa1nVLF8CIw=
-cloud.google.com/go/auth v0.5.1/go.mod h1:vbZT8GjzDf3AVqCcQmqeeM32U9HBFc32vVVAbwDsa6s=
-cloud.google.com/go/auth/oauth2adapt v0.2.2 h1:+TTV8aXpjeChS9M+aTtN/TjdQnzJvmzKFt//oWu7HX4=
-cloud.google.com/go/auth/oauth2adapt v0.2.2/go.mod h1:wcYjgpZI9+Yu7LyYBg4pqSiaRkfEK3GQcpb7C/uyF1Q=
+cloud.google.com/go/auth v0.7.2 h1:uiha352VrCDMXg+yoBtaD0tUF4Kv9vrtrWPYXwutnDE=
+cloud.google.com/go/auth v0.7.2/go.mod h1:VEc4p5NNxycWQTMQEDQF0bd6aTMb6VgYDXEwiJJQAbs=
+cloud.google.com/go/auth/oauth2adapt v0.2.3 h1:MlxF+Pd3OmSudg/b1yZ5lJwoXCEaeedAguodky1PcKI=
+cloud.google.com/go/auth/oauth2adapt v0.2.3/go.mod h1:tMQXOfZzFuNuUxOypHlQEXgdfX5cuhwU+ffUuXRJE8I=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
 cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
 cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
 cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
-cloud.google.com/go/compute/metadata v0.3.0 h1:Tz+eQXMEqDIKRsmY3cHTL6FVaynIjX2QxYC4trgAKZc=
-cloud.google.com/go/compute/metadata v0.3.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k=
+cloud.google.com/go/compute/metadata v0.5.0 h1:Zr0eK8JbFv6+Wi4ilXAR8FJ3wyNdpxHKJNPos6LTZOY=
+cloud.google.com/go/compute/metadata v0.5.0/go.mod h1:aHnloV2TPI38yx4s9+wAZhHykWvVCfu7hQbF+9CWoiY=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
@@ -36,12 +36,12 @@ cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohl
 cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/Azure/azure-sdk-for-go/sdk/azcore v1.11.1 h1:E+OJmp2tPvt1W+amx48v1eqbjDYsgN+RzP4q16yV5eM=
-github.com/Azure/azure-sdk-for-go/sdk/azcore v1.11.1/go.mod h1:a6xsAQUZg+VsS3TJ05SRp524Hs4pZ/AeFSr5ENf0Yjo=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.5.2 h1:FDif4R1+UUR+00q6wquyX90K7A8dN+R5E8GEadoP7sU=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.5.2/go.mod h1:aiYBYui4BJ/BJCAIKs92XiPyQfTaBWqvHujDwKb6CBU=
-github.com/Azure/azure-sdk-for-go/sdk/internal v1.6.0 h1:sUFnFjzDUie80h24I7mrKtwCKgLY9L8h5Tp2x9+TWqk=
-github.com/Azure/azure-sdk-for-go/sdk/internal v1.6.0/go.mod h1:52JbnQTp15qg5mRkMBHwp0j0ZFwHJ42Sx3zVV5RE9p0=
+github.com/Azure/azure-sdk-for-go/sdk/azcore v1.13.0 h1:GJHeeA2N7xrG3q30L2UXDyuWRzDM900/65j70wcM4Ww=
+github.com/Azure/azure-sdk-for-go/sdk/azcore v1.13.0/go.mod h1:l38EPgmsp71HHLq9j7De57JcKOWPyhrsW1Awm1JS6K0=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.7.0 h1:tfLQ34V6F7tVSwoTf/4lH5sE0o6eCJuNDTmH09nDpbc=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.7.0/go.mod h1:9kIvujWAA58nmPmWB1m23fyWic1kYZMxD9CxaWn4Qpg=
+github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0 h1:ywEEhmNahHBihViHepv3xPBn1663uRv2t2q/ESv9seY=
+github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0/go.mod h1:iZDifYGJTIgIIkYRNWPENUnqx6bJ2xnSDFI2tjwZNuY=
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v5 v5.7.0 h1:LkHbJbgF3YyvC53aqYGR+wWQDn2Rdp9AQdGndf9QvY4=
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v5 v5.7.0/go.mod h1:QyiQdW4f4/BIfB8ZutZ2s+28RAgfa/pT+zS++ZHyM1I=
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/internal/v2 v2.0.0 h1:PTFGRSlMKCQelWwxUyYVEUqseBJVemLyqWJjvMyt0do=
@@ -75,8 +75,8 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuy
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
-github.com/alecthomas/units v0.0.0-20231202071711-9a357b53e9c9 h1:ez/4by2iGztzR4L0zgAOR8lTQK9VlyBVVd7G4omaOQs=
-github.com/alecthomas/units v0.0.0-20231202071711-9a357b53e9c9/go.mod h1:OMCwj8VM1Kc9e19TLln2VL61YJF0x1XFtfdL4JdbSyE=
+github.com/alecthomas/units v0.0.0-20240626203959-61d1e3462e30 h1:t3eaIm0rUkzbrIewtiFmMK5RXHej2XnoXNhxVsAYUfg=
+github.com/alecthomas/units v0.0.0-20240626203959-61d1e3462e30/go.mod h1:fvzegU4vN3H1qMT+8wDmzjAcDONcgo2/SZ/TyfdUOFs=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
@@ -92,8 +92,8 @@ github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:W
 github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
 github.com/aws/aws-sdk-go v1.27.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.38.35/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
-github.com/aws/aws-sdk-go v1.53.16 h1:8oZjKQO/ml1WLUZw5hvF7pvYjPf8o9f57Wldoy/q9Qc=
-github.com/aws/aws-sdk-go v1.53.16/go.mod h1:LF8svs817+Nz+DmiMQKTO3ubZ/6IaTpq3TjupRn3Eqk=
+github.com/aws/aws-sdk-go v1.54.19 h1:tyWV+07jagrNiCcGRzRhdtVjQs7Vy41NwsuOcl0IbVI=
+github.com/aws/aws-sdk-go v1.54.19/go.mod h1:eRwEWoyTWFMVYVQzKMNHWP5/RV4xIUGMQfXQHfHkpNU=
 github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZwxzkQq9wy+g=
 github.com/bboreham/go-loser v0.0.0-20230920113527-fcc2c21820a3 h1:6df1vn4bBlDDo4tARvBm7l6KA9iVMnE3NWizDeWSrps=
 github.com/bboreham/go-loser v0.0.0-20230920113527-fcc2c21820a3/go.mod h1:CIWtjkly68+yqLPbvwwR/fjNJA/idrtULjZWh2v1ys0=
@@ -120,8 +120,8 @@ github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp
 github.com/clbanning/x2j v0.0.0-20191024224557-825249438eec/go.mod h1:jMjuTZXRI4dUb/I5gc9Hdhagfvm9+RyrPryS/auMzxE=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
-github.com/cncf/xds/go v0.0.0-20240318125728-8a4994d93e50 h1:DBmgJDC9dTfkVyGgipamEh2BpGYxScCH1TOF1LL1cXc=
-github.com/cncf/xds/go v0.0.0-20240318125728-8a4994d93e50/go.mod h1:5e1+Vvlzido69INQaVO6d87Qn543Xr6nooe9Kz7oBFM=
+github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b h1:ga8SEFjZ60pxLcmhnThWgvH2wg8376yUJmPhEH4H3kw=
+github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b/go.mod h1:W+zGtBO5Y1IgJhy4+A9GOqVhqLpfZi+vwmdNXUehLA8=
 github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
 github.com/containerd/cgroups/v3 v3.0.3 h1:S5ByHZ/h9PMe5IOQoN7E+nMc2UcLEM/V48DGDJ9kip0=
@@ -143,14 +143,14 @@ github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8Yc
 github.com/dennwc/varint v1.0.0 h1:kGNFFSSw8ToIy3obO/kKr8U9GZYUAxQEVuix4zfDWzE=
 github.com/dennwc/varint v1.0.0/go.mod h1:hnItb35rvZvJrbTALZtY/iQfDs48JKRG1RPpgziApxA=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
-github.com/digitalocean/godo v1.117.0 h1:WVlTe09melDYTd7VCVyvHcNWbgB+uI1O115+5LOtdSw=
-github.com/digitalocean/godo v1.117.0/go.mod h1:Vk0vpCot2HOAJwc5WE8wljZGtJ3ZtWIc8MQ8rF38sdo=
+github.com/digitalocean/godo v1.119.0 h1:dmFNQwSIAcH3z+FVovHLkazKDC2uA8oOlGvg5+H4vRw=
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@@ -210,8 +210,8 @@ github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG
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@@ -251,8 +251,8 @@ github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69
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@@ -319,8 +319,8 @@ github.com/google/pprof v0.0.0-20200212024743-f11f1df84d12/go.mod h1:ZgVRPoUq/hf
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@@ -332,10 +332,10 @@ github.com/googleapis/enterprise-certificate-proxy v0.3.2 h1:Vie5ybvEvT75RniqhfF
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@@ -353,10 +353,10 @@ github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFb
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@@ -396,8 +396,8 @@ github.com/hashicorp/go-uuid v1.0.1/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/b
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@@ -409,13 +409,13 @@ github.com/hashicorp/mdns v1.0.4/go.mod h1:mtBihi+LeNXGtG8L9dX59gAEa12BDtBQSp4v/
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@@ -454,8 +454,8 @@ github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8
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@@ -472,8 +472,8 @@ github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0
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@@ -500,8 +500,8 @@ github.com/maxatome/go-testdeep v1.12.0/go.mod h1:lPZc/HAcJMP92l7yI6TRz1aZN5URwU
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+github.com/miekg/dns v1.1.61/go.mod h1:mnAarhS3nWaW+NVP2wTkYVIZyHNJ098SJZUki3eykwQ=
 github.com/mitchellh/cli v1.0.0/go.mod h1:hNIlj7HEI86fIcpObd7a0FcrxTWetlwJDGcceTlRvqc=
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@@ -573,8 +573,8 @@ github.com/openzipkin-contrib/zipkin-go-opentracing v0.4.5/go.mod h1:/wsWhb9smxS
 github.com/openzipkin/zipkin-go v0.1.6/go.mod h1:QgAqvLzwWbR/WpD4A3cGpPtJrZXNIiJc5AZX7/PBEpw=
 github.com/openzipkin/zipkin-go v0.2.1/go.mod h1:NaW6tEwdmWMaCDZzg8sh+IBNOxHMPnhQw8ySjnjRyN4=
 github.com/openzipkin/zipkin-go v0.2.2/go.mod h1:NaW6tEwdmWMaCDZzg8sh+IBNOxHMPnhQw8ySjnjRyN4=
-github.com/ovh/go-ovh v1.5.1 h1:P8O+7H+NQuFK9P/j4sFW5C0fvSS2DnHYGPwdVCp45wI=
-github.com/ovh/go-ovh v1.5.1/go.mod h1:cTVDnl94z4tl8pP1uZ/8jlVxntjSIf09bNcQ5TJSC7c=
+github.com/ovh/go-ovh v1.6.0 h1:ixLOwxQdzYDx296sXcgS35TOPEahJkpjMGtzPadCjQI=
+github.com/ovh/go-ovh v1.6.0/go.mod h1:cTVDnl94z4tl8pP1uZ/8jlVxntjSIf09bNcQ5TJSC7c=
 github.com/pact-foundation/pact-go v1.0.4/go.mod h1:uExwJY4kCzNPcHRj+hCR/HBbOOIwwtUjcrb0b5/5kLM=
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
 github.com/pascaldekloe/goe v0.1.0 h1:cBOtyMzM9HTpWjXfbbunk26uA6nG3a8n06Wieeh0MwY=
@@ -625,8 +625,8 @@ github.com/prometheus/common v0.9.1/go.mod h1:yhUN8i9wzaXS3w1O07YhxHEBxD+W35wd8b
 github.com/prometheus/common v0.10.0/go.mod h1:Tlit/dnDKsSWFlCLTWaA1cyBgKHSMdTB80sz/V91rCo=
 github.com/prometheus/common v0.26.0/go.mod h1:M7rCNAaPfAosfx8veZJCuw84e35h3Cfd9VFqTh1DIvc=
 github.com/prometheus/common v0.29.0/go.mod h1:vu+V0TpY+O6vW9J44gczi3Ap/oXXR10b+M/gUGO4Hls=
-github.com/prometheus/common v0.54.0 h1:ZlZy0BgJhTwVZUn7dLOkwCZHUkrAqd3WYtcFCWnM1D8=
-github.com/prometheus/common v0.54.0/go.mod h1:/TQgMJP5CuVYveyT7n/0Ix8yLNNXy9yRSkhnLTHPDIQ=
+github.com/prometheus/common v0.55.0 h1:KEi6DK7lXW/m7Ig5i47x0vRzuBsHuvJdi5ee6Y3G1dc=
+github.com/prometheus/common v0.55.0/go.mod h1:2SECS4xJG1kd8XF9IcM1gMX6510RAEL65zxzNImwdc8=
 github.com/prometheus/common/assets v0.2.0 h1:0P5OrzoHrYBOSM1OigWL3mY8ZvV2N4zIE/5AahrSrfM=
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 github.com/prometheus/common/sigv4 v0.1.0 h1:qoVebwtwwEhS85Czm2dSROY5fTo2PAPEVdDeppTwGX4=
@@ -639,8 +639,8 @@ github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsT
 github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+GxbHq6oeK9A=
 github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
 github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
-github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k6Bo=
-github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
+github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
+github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqnVzQkZxMG4s8nGwiZ5l3QUCyqpo9Y+/ZMZ9VjZe4=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
@@ -650,8 +650,8 @@ github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
 github.com/samuel/go-zookeeper v0.0.0-20190923202752-2cc03de413da/go.mod h1:gi+0XIa01GRL2eRQVjQkKGqKF3SF9vZR/HnPullcV2E=
-github.com/scaleway/scaleway-sdk-go v1.0.0-beta.27 h1:yGAraK1uUjlhSXgNMIy8o/J4LFNcy7yeipBqt9N9mVg=
-github.com/scaleway/scaleway-sdk-go v1.0.0-beta.27/go.mod h1:fCa7OJZ/9DRTnOKmxvT6pn+LPWUptQAmHF/SBJUGEcg=
+github.com/scaleway/scaleway-sdk-go v1.0.0-beta.29 h1:BkTk4gynLjguayxrYxZoMZjBnAOh7ntQvUkOFmkMqPU=
+github.com/scaleway/scaleway-sdk-go v1.0.0-beta.29/go.mod h1:fCa7OJZ/9DRTnOKmxvT6pn+LPWUptQAmHF/SBJUGEcg=
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529 h1:nn5Wsu0esKSJiIVhscUtVbo7ada43DJhG55ua/hjS5I=
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
 github.com/shoenig/test v1.7.1 h1:UJcjSAI3aUKx52kfcfhblgyhZceouhvvs3OYdWgn+PY=
@@ -694,6 +694,7 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.7.2/go.mod h1:R6va5+xMeoiuVRoj+gSkQ7d3FALtqAAGI1FQKckRals=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
@@ -723,28 +724,28 @@ go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.24.0 h1:y73uSU6J157QMP2kn2r30vwW1A2W2WFwSCGnAVxeaD0=
 go.opencensus.io v0.24.0/go.mod h1:vNK8G9p7aAivkbmorf4v+7Hgx+Zs0yY+0fOtgBfjQKo=
-go.opentelemetry.io/collector/pdata v1.8.0 h1:d/QQgZxB4Y+d3mqLVh2ozvzujUhloD3P/fk7X+In764=
-go.opentelemetry.io/collector/pdata v1.8.0/go.mod h1:/W7clu0wFC4WSRp94Ucn6Vm36Wkrt+tmtlDb1aiNZCY=
-go.opentelemetry.io/collector/semconv v0.101.0 h1:tOe9iTe9dDCnvz/bqgfNRr4w80kXG8505tQJ5h5v08Q=
-go.opentelemetry.io/collector/semconv v0.101.0/go.mod h1:8ElcRZ8Cdw5JnvhTOQOdYizkJaQ10Z2fS+R6djOnj6A=
-go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.52.0 h1:9l89oX4ba9kHbBol3Xin3leYJ+252h0zszDtBwyKe2A=
-go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.52.0/go.mod h1:XLZfZboOJWHNKUv7eH0inh0E9VV6eWDFB/9yJyTLPp0=
-go.opentelemetry.io/otel v1.27.0 h1:9BZoF3yMK/O1AafMiQTVu0YDj5Ea4hPhxCs7sGva+cg=
-go.opentelemetry.io/otel v1.27.0/go.mod h1:DMpAK8fzYRzs+bi3rS5REupisuqTheUlSZJ1WnZaPAQ=
-go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.27.0 h1:R9DE4kQ4k+YtfLI2ULwX82VtNQ2J8yZmA7ZIF/D+7Mc=
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-go.opentelemetry.io/otel/metric v1.27.0/go.mod h1:mVFgmRlhljgBiuk/MP/oKylr4hs85GZAylncepAX/ak=
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+go.opentelemetry.io/otel/trace v1.28.0/go.mod h1:jPyXzNPg6da9+38HEwElrQiHlVMTnVfM3/yv2OlIHaI=
+go.opentelemetry.io/proto/otlp v1.3.1 h1:TrMUixzpM0yuc/znrFTP9MMRh8trP93mkCiDVeXrui0=
+go.opentelemetry.io/proto/otlp v1.3.1/go.mod h1:0X1WI4de4ZsLrrJNLAQbFeLCm3T7yBkR0XqQ7niQU+8=
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 go.uber.org/atomic v1.5.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
 go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
@@ -773,8 +774,8 @@ golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5y
 golang.org/x/crypto v0.0.0-20220829220503-c86fa9a7ed90/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
 golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
 golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
-golang.org/x/crypto v0.24.0 h1:mnl8DM0o513X8fdIkmyFE/5hTYxbwYOjDS/+rK6qpRI=
-golang.org/x/crypto v0.24.0/go.mod h1:Z1PMYSOR5nyMcyAVAIQSKCDwalqy85Aqn1x3Ws4L5DM=
+golang.org/x/crypto v0.25.0 h1:ypSNr+bnYL2YhwoMt2zPxHFmbAN1KZs/njMG3hxUp30=
+golang.org/x/crypto v0.25.0/go.mod h1:T+wALwcMOSE0kXgUAnPAHqTLW+XHgcELELW8VaDgm/M=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -809,8 +810,8 @@ golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/mod v0.18.0 h1:5+9lSbEzPSdWkH32vYPBwEpX8KwDbM52Ud9xBUvNlb0=
-golang.org/x/mod v0.18.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.19.0 h1:fEdghXQSo20giMthA7cd28ZC+jts4amQ3YMXiP5oMQ8=
+golang.org/x/mod v0.19.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -856,8 +857,8 @@ golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
 golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
 golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
-golang.org/x/net v0.26.0 h1:soB7SVo0PWrY4vPW/+ay0jKDNScG2X9wFeYlXIvJsOQ=
-golang.org/x/net v0.26.0/go.mod h1:5YKkiSynbBIh3p6iOc/vibscux0x38BZDkn8sCUPxHE=
+golang.org/x/net v0.27.0 h1:5K3Njcw06/l2y9vpGCSdcxWOYHOUk3dVNGDXN+FvAys=
+golang.org/x/net v0.27.0/go.mod h1:dDi0PyhWNoiUOrAS8uXv/vnScO4wnHQO4mj9fn/RytE=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -946,16 +947,16 @@ golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
-golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
+golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
 golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
 golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
 golang.org/x/term v0.20.0/go.mod h1:8UkIAJTvZgivsXaD6/pH6U9ecQzZ45awqEOzuCvwpFY=
-golang.org/x/term v0.21.0 h1:WVXCp+/EBEHOj53Rvu+7KiT/iElMrO8ACK16SMZ3jaA=
-golang.org/x/term v0.21.0/go.mod h1:ooXLefLobQVslOqselCNF4SxFAaoS6KujMbsGzSDmX0=
+golang.org/x/term v0.22.0 h1:BbsgPEJULsl2fV/AT3v15Mjva5yXKQDyKf+TbDz7QJk=
+golang.org/x/term v0.22.0/go.mod h1:F3qCibpT5AMpCRfhfT53vVJwhLtIVHhB9XDjfFvnMI4=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -1025,8 +1026,8 @@ golang.org/x/tools v0.0.0-20200825202427-b303f430e36d/go.mod h1:njjCfa9FT2d7l9Bc
 golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/tools v0.22.0 h1:gqSGLZqv+AI9lIQzniJ0nZDRG5GBPsSi+DRNHWNz6yA=
-golang.org/x/tools v0.22.0/go.mod h1:aCwcsjqvq7Yqt6TNyX7QMU2enbQ/Gt0bo6krSeEri+c=
+golang.org/x/tools v0.23.0 h1:SGsXPZ+2l4JsgaCKkx+FQ9YZ5XEtA1GZYuoDjenLjvg=
+golang.org/x/tools v0.23.0/go.mod h1:pnu6ufv6vQkll6szChhK3C3L/ruaIv5eBeztNG8wtsI=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -1046,8 +1047,8 @@ google.golang.org/api v0.20.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/
 google.golang.org/api v0.22.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
 google.golang.org/api v0.24.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0MncE=
 google.golang.org/api v0.28.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0MncE=
-google.golang.org/api v0.183.0 h1:PNMeRDwo1pJdgNcFQ9GstuLe/noWKIc89pRWRLMvLwE=
-google.golang.org/api v0.183.0/go.mod h1:q43adC5/pHoSZTx5h2mSmdF7NcyfW9JuDyIOJAgS9ZQ=
+google.golang.org/api v0.189.0 h1:equMo30LypAkdkLMBqfeIqtyAnlyig1JSZArl4XPwdI=
+google.golang.org/api v0.189.0/go.mod h1:FLWGJKb0hb+pU2j+rJqwbnsF+ym+fQs73rbJ+KAUgy8=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
@@ -1084,10 +1085,10 @@ google.golang.org/genproto v0.0.0-20200515170657-fc4c6c6a6587/go.mod h1:YsZOwe1m
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
 google.golang.org/genproto v0.0.0-20200618031413-b414f8b61790/go.mod h1:jDfRM7FcilCzHH/e9qn6dsT145K34l5v+OpcnNgKAAA=
 google.golang.org/genproto v0.0.0-20200825200019-8632dd797987/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157 h1:7whR9kGa5LUwFtpLm2ArCEejtnxlGeLbAyjFY8sGNFw=
-google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157/go.mod h1:99sLkeliLXfdj2J75X3Ho+rrVCaJze0uwN7zDDkjPVU=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 h1:Zy9XzmMEflZ/MAaA7vNcoebnRAld7FsPW1EeBB7V0m8=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157/go.mod h1:EfXuqaE1J41VCDicxHzUDm+8rk+7ZdXzHV0IhO/I6s0=
+google.golang.org/genproto/googleapis/api v0.0.0-20240711142825-46eb208f015d h1:kHjw/5UfflP/L5EbledDrcG4C2597RtymmGRZvHiCuY=
+google.golang.org/genproto/googleapis/api v0.0.0-20240711142825-46eb208f015d/go.mod h1:mw8MG/Qz5wfgYr6VqVCiZcHe/GJEfI+oGGDCohaVgB0=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240722135656-d784300faade h1:oCRSWfwGXQsqlVdErcyTt4A93Y8fo0/9D4b1gnI++qo=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240722135656-d784300faade/go.mod h1:Ue6ibwXGpU+dqIcODieyLOcgj7z8+IcskoNIgZxtrFY=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.0/go.mod h1:chYK+tFQF0nDUGJgXMSgLCQk3phJEuONr2DCgLDdAQM=
@@ -1106,8 +1107,8 @@ google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3Iji
 google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
 google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
-google.golang.org/grpc v1.64.0 h1:KH3VH9y/MgNQg1dE7b3XfVK0GsPSIzJwdF617gUSbvY=
-google.golang.org/grpc v1.64.0/go.mod h1:oxjF8E3FBnjp+/gVFYdWacaLDx9na1aqy9oovLpxQYg=
+google.golang.org/grpc v1.65.0 h1:bs/cUb4lp1G5iImFFd3u5ixQzweKizoZJAwBNLR42lc=
+google.golang.org/grpc v1.65.0/go.mod h1:WgYC2ypjlB0EiQi6wdKixMqukr6lBc0Vo+oOgjrM5ZQ=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -1119,8 +1120,8 @@ google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpAD
 google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
-google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

model/labels/labels.go

@@ -38,10 +38,10 @@ func (ls Labels) Bytes(buf []byte) []byte {
 	b.WriteByte(labelSep)
 	for i, l := range ls {
 		if i > 0 {
-			b.WriteByte(seps[0])
+			b.WriteByte(sep)
 		}
 		b.WriteString(l.Name)
-		b.WriteByte(seps[0])
+		b.WriteByte(sep)
 		b.WriteString(l.Value)
 	}
 	return b.Bytes()
@@ -86,9 +86,9 @@ func (ls Labels) Hash() uint64 {
 		}
 
 		b = append(b, v.Name...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		b = append(b, v.Value...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 	}
 	return xxhash.Sum64(b)
 }
@@ -106,9 +106,9 @@ func (ls Labels) HashForLabels(b []byte, names ...string) (uint64, []byte) {
 			i++
 		default:
 			b = append(b, ls[i].Name...)
-			b = append(b, seps[0])
+			b = append(b, sep)
 			b = append(b, ls[i].Value...)
-			b = append(b, seps[0])
+			b = append(b, sep)
 			i++
 			j++
 		}
@@ -130,9 +130,9 @@ func (ls Labels) HashWithoutLabels(b []byte, names ...string) (uint64, []byte) {
 			continue
 		}
 		b = append(b, ls[i].Name...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		b = append(b, ls[i].Value...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 	}
 	return xxhash.Sum64(b), b
 }
@@ -151,10 +151,10 @@ func (ls Labels) BytesWithLabels(buf []byte, names ...string) []byte {
 			i++
 		default:
 			if b.Len() > 1 {
-				b.WriteByte(seps[0])
+				b.WriteByte(sep)
 			}
 			b.WriteString(ls[i].Name)
-			b.WriteByte(seps[0])
+			b.WriteByte(sep)
 			b.WriteString(ls[i].Value)
 			i++
 			j++
@@ -177,10 +177,10 @@ func (ls Labels) BytesWithoutLabels(buf []byte, names ...string) []byte {
 			continue
 		}
 		if b.Len() > 1 {
-			b.WriteByte(seps[0])
+			b.WriteByte(sep)
 		}
 		b.WriteString(ls[i].Name)
-		b.WriteByte(seps[0])
+		b.WriteByte(sep)
 		b.WriteString(ls[i].Value)
 	}
 	return b.Bytes()

model/labels/labels_common.go

@@ -29,10 +29,11 @@ const (
 	BucketLabel  = "le"
 	InstanceName = "instance"
 
-	labelSep = '\xfe'
+	labelSep = '\xfe' // Used at beginning of `Bytes` return.
+	sep      = '\xff' // Used between labels in `Bytes` and `Hash`.
 )
 
-var seps = []byte{'\xff'}
+var seps = []byte{sep} // Used with Hash, which has no WriteByte method.
 
 // Label is a key/value pair of strings.
 type Label struct {

model/labels/labels_dedupelabels.go

@@ -146,13 +146,13 @@ func (ls Labels) Bytes(buf []byte) []byte {
 	b := bytes.NewBuffer(buf[:0])
 	for i := 0; i < len(ls.data); {
 		if i > 0 {
-			b.WriteByte(seps[0])
+			b.WriteByte(sep)
 		}
 		var name, value string
 		name, i = decodeString(ls.syms, ls.data, i)
 		value, i = decodeString(ls.syms, ls.data, i)
 		b.WriteString(name)
-		b.WriteByte(seps[0])
+		b.WriteByte(sep)
 		b.WriteString(value)
 	}
 	return b.Bytes()
@@ -201,9 +201,9 @@ func (ls Labels) Hash() uint64 {
 		}
 
 		b = append(b, name...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		b = append(b, value...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		pos = newPos
 	}
 	return xxhash.Sum64(b)
@@ -226,9 +226,9 @@ func (ls Labels) HashForLabels(b []byte, names ...string) (uint64, []byte) {
 		}
 		if name == names[j] {
 			b = append(b, name...)
-			b = append(b, seps[0])
+			b = append(b, sep)
 			b = append(b, value...)
-			b = append(b, seps[0])
+			b = append(b, sep)
 		}
 	}
 
@@ -252,9 +252,9 @@ func (ls Labels) HashWithoutLabels(b []byte, names ...string) (uint64, []byte) {
 			continue
 		}
 		b = append(b, name...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		b = append(b, value...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 	}
 	return xxhash.Sum64(b), b
 }
@@ -275,10 +275,10 @@ func (ls Labels) BytesWithLabels(buf []byte, names ...string) []byte {
 		}
 		if lName == names[j] {
 			if b.Len() > 1 {
-				b.WriteByte(seps[0])
+				b.WriteByte(sep)
 			}
 			b.WriteString(lName)
-			b.WriteByte(seps[0])
+			b.WriteByte(sep)
 			b.WriteString(lValue)
 		}
 		pos = newPos
@@ -299,10 +299,10 @@ func (ls Labels) BytesWithoutLabels(buf []byte, names ...string) []byte {
 		}
 		if j == len(names) || lName != names[j] {
 			if b.Len() > 1 {
-				b.WriteByte(seps[0])
+				b.WriteByte(sep)
 			}
 			b.WriteString(lName)
-			b.WriteByte(seps[0])
+			b.WriteByte(sep)
 			b.WriteString(lValue)
 		}
 		pos = newPos

model/labels/labels_stringlabels.go

@@ -112,9 +112,9 @@ func (ls Labels) HashForLabels(b []byte, names ...string) (uint64, []byte) {
 		}
 		if name == names[j] {
 			b = append(b, name...)
-			b = append(b, seps[0])
+			b = append(b, sep)
 			b = append(b, value...)
-			b = append(b, seps[0])
+			b = append(b, sep)
 		}
 	}
 
@@ -138,9 +138,9 @@ func (ls Labels) HashWithoutLabels(b []byte, names ...string) (uint64, []byte) {
 			continue
 		}
 		b = append(b, name...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		b = append(b, value...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 	}
 	return xxhash.Sum64(b), b
 }

model/labels/sharding.go

@@ -39,9 +39,9 @@ func StableHash(ls Labels) uint64 {
 		}
 
 		b = append(b, v.Name...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		b = append(b, v.Value...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 	}
 	return xxhash.Sum64(b)
 }

model/labels/sharding_dedupelabels.go

@@ -43,9 +43,9 @@ func StableHash(ls Labels) uint64 {
 		}
 
 		b = append(b, name...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		b = append(b, value...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		pos = newPos
 	}
 	return xxhash.Sum64(b)

model/labels/sharding_stringlabels.go

@@ -43,9 +43,9 @@ func StableHash(ls Labels) uint64 {
 		}
 
 		b = append(b, v.Name...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 		b = append(b, v.Value...)
-		b = append(b, seps[0])
+		b = append(b, sep)
 	}
 	if h != nil {
 		return h.Sum64()

model/relabel/relabel.go

@@ -213,6 +213,10 @@ func (re Regexp) IsZero() bool {
 
 // String returns the original string used to compile the regular expression.
 func (re Regexp) String() string {
+	if re.Regexp == nil {
+		return ""
+	}
+
 	str := re.Regexp.String()
 	// Trim the anchor `^(?:` prefix and `)$` suffix.
 	return str[4 : len(str)-2]

model/relabel/relabel_test.go

@@ -900,3 +900,16 @@ action: replace
 		})
 	}
 }
+
+func TestRegexp_ShouldMarshalAndUnmarshalZeroValue(t *testing.T) {
+	var zero Regexp
+
+	marshalled, err := yaml.Marshal(&zero)
+	require.NoError(t, err)
+	require.Equal(t, "null\n", string(marshalled))
+
+	var unmarshalled Regexp
+	err = yaml.Unmarshal(marshalled, &unmarshalled)
+	require.NoError(t, err)
+	require.Nil(t, unmarshalled.Regexp)
+}

promql/engine_test.go

@@ -26,7 +26,6 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/require"
-	"go.uber.org/goleak"
 
 	"github.com/prometheus/prometheus/model/histogram"
 	"github.com/prometheus/prometheus/model/labels"
@@ -51,7 +50,7 @@ const (
 func TestMain(m *testing.M) {
 	// Enable experimental functions testing
 	parser.EnableExperimentalFunctions = true
-	goleak.VerifyTestMain(m)
+	testutil.TolerantVerifyLeak(m)
 }
 
 func TestQueryConcurrency(t *testing.T) {
@@ -238,11 +237,11 @@ func (q *errQuerier) Select(context.Context, bool, *storage.SelectHints, ...*lab
 	return errSeriesSet{err: q.err}
 }
 
-func (*errQuerier) LabelValues(context.Context, string, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (*errQuerier) LabelValues(context.Context, string, *storage.LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, nil
 }
 
-func (*errQuerier) LabelNames(context.Context, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (*errQuerier) LabelNames(context.Context, *storage.LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, nil
 }
 func (*errQuerier) Close() error { return nil }

promql/histogram_stats_iterator.go

@@ -48,7 +48,6 @@ func (f *histogramStatsIterator) AtHistogram(h *histogram.Histogram) (int64, *hi
 	var t int64
 	t, f.currentH = f.Iterator.AtHistogram(f.currentH)
 	if value.IsStaleNaN(f.currentH.Sum) {
-		f.setLastH(f.currentH)
 		h = &histogram.Histogram{Sum: f.currentH.Sum}
 		return t, h
 	}
@@ -63,9 +62,13 @@ func (f *histogramStatsIterator) AtHistogram(h *histogram.Histogram) (int64, *hi
 		return t, h
 	}
 
-	h.CounterResetHint = f.getResetHint(f.currentH)
-	h.Count = f.currentH.Count
-	h.Sum = f.currentH.Sum
+	returnValue := histogram.Histogram{
+		CounterResetHint: f.getResetHint(f.currentH),
+		Count:            f.currentH.Count,
+		Sum:              f.currentH.Sum,
+	}
+	returnValue.CopyTo(h)
+
 	f.setLastH(f.currentH)
 	return t, h
 }
@@ -77,7 +80,6 @@ func (f *histogramStatsIterator) AtFloatHistogram(fh *histogram.FloatHistogram)
 	var t int64
 	t, f.currentFH = f.Iterator.AtFloatHistogram(f.currentFH)
 	if value.IsStaleNaN(f.currentFH.Sum) {
-		f.setLastFH(f.currentFH)
 		return t, &histogram.FloatHistogram{Sum: f.currentFH.Sum}
 	}
 
@@ -91,9 +93,13 @@ func (f *histogramStatsIterator) AtFloatHistogram(fh *histogram.FloatHistogram)
 		return t, fh
 	}
 
-	fh.CounterResetHint = f.getFloatResetHint(f.currentFH.CounterResetHint)
-	fh.Count = f.currentFH.Count
-	fh.Sum = f.currentFH.Sum
+	returnValue := histogram.FloatHistogram{
+		CounterResetHint: f.getFloatResetHint(f.currentFH.CounterResetHint),
+		Count:            f.currentFH.Count,
+		Sum:              f.currentFH.Sum,
+	}
+	returnValue.CopyTo(fh)
+
 	f.setLastFH(f.currentFH)
 	return t, fh
 }

promql/histogram_stats_iterator_test.go

@@ -14,62 +14,132 @@
 package promql
 
 import (
+	"fmt"
+	"math"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 
 	"github.com/prometheus/prometheus/model/histogram"
 	"github.com/prometheus/prometheus/model/labels"
+	"github.com/prometheus/prometheus/model/value"
 	"github.com/prometheus/prometheus/tsdb/chunkenc"
 	"github.com/prometheus/prometheus/tsdb/tsdbutil"
 )
 
 func TestHistogramStatsDecoding(t *testing.T) {
-	histograms := []*histogram.Histogram{
-		tsdbutil.GenerateTestHistogram(0),
-		tsdbutil.GenerateTestHistogram(1),
-		tsdbutil.GenerateTestHistogram(2),
-		tsdbutil.GenerateTestHistogram(2),
-	}
-	histograms[0].CounterResetHint = histogram.NotCounterReset
-	histograms[1].CounterResetHint = histogram.UnknownCounterReset
-	histograms[2].CounterResetHint = histogram.CounterReset
-	histograms[3].CounterResetHint = histogram.UnknownCounterReset
-
-	expectedHints := []histogram.CounterResetHint{
+	cases := []struct {
+		name          string
+		histograms    []*histogram.Histogram
+		expectedHints []histogram.CounterResetHint
+	}{
+		{
+			name: "unknown counter reset triggers detection",
+			histograms: []*histogram.Histogram{
+				tsdbutil.GenerateTestHistogramWithHint(0, histogram.NotCounterReset),
+				tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
+				tsdbutil.GenerateTestHistogramWithHint(2, histogram.CounterReset),
+				tsdbutil.GenerateTestHistogramWithHint(2, histogram.UnknownCounterReset),
+			},
+			expectedHints: []histogram.CounterResetHint{
 				histogram.NotCounterReset,
 				histogram.NotCounterReset,
 				histogram.CounterReset,
 				histogram.NotCounterReset,
+			},
+		},
+		{
+			name: "stale sample before unknown reset hint",
+			histograms: []*histogram.Histogram{
+				tsdbutil.GenerateTestHistogramWithHint(0, histogram.NotCounterReset),
+				tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
+				{Sum: math.Float64frombits(value.StaleNaN)},
+				tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
+			},
+			expectedHints: []histogram.CounterResetHint{
+				histogram.NotCounterReset,
+				histogram.NotCounterReset,
+				histogram.UnknownCounterReset,
+				histogram.NotCounterReset,
+			},
+		},
+		{
+			name: "unknown counter reset at the beginning",
+			histograms: []*histogram.Histogram{
+				tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
+			},
+			expectedHints: []histogram.CounterResetHint{
+				histogram.NotCounterReset,
+			},
+		},
+		{
+			name: "detect real counter reset",
+			histograms: []*histogram.Histogram{
+				tsdbutil.GenerateTestHistogramWithHint(2, histogram.UnknownCounterReset),
+				tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
+			},
+			expectedHints: []histogram.CounterResetHint{
+				histogram.NotCounterReset,
+				histogram.CounterReset,
+			},
+		},
+		{
+			name: "detect real counter reset after stale NaN",
+			histograms: []*histogram.Histogram{
+				tsdbutil.GenerateTestHistogramWithHint(2, histogram.UnknownCounterReset),
+				{Sum: math.Float64frombits(value.StaleNaN)},
+				tsdbutil.GenerateTestHistogramWithHint(1, histogram.UnknownCounterReset),
+			},
+			expectedHints: []histogram.CounterResetHint{
+				histogram.NotCounterReset,
+				histogram.UnknownCounterReset,
+				histogram.CounterReset,
+			},
+		},
 	}
 
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
 			t.Run("histogram_stats", func(t *testing.T) {
 				decodedStats := make([]*histogram.Histogram, 0)
-		statsIterator := NewHistogramStatsIterator(newHistogramSeries(histograms).Iterator(nil))
+				statsIterator := NewHistogramStatsIterator(newHistogramSeries(tc.histograms).Iterator(nil))
 				for statsIterator.Next() != chunkenc.ValNone {
 					_, h := statsIterator.AtHistogram(nil)
 					decodedStats = append(decodedStats, h)
 				}
-		for i := 0; i < len(histograms); i++ {
-			require.Equal(t, expectedHints[i], decodedStats[i].CounterResetHint)
-			require.Equal(t, histograms[i].Count, decodedStats[i].Count)
-			require.Equal(t, histograms[i].Sum, decodedStats[i].Sum)
+				for i := 0; i < len(tc.histograms); i++ {
+					require.Equal(t, tc.expectedHints[i], decodedStats[i].CounterResetHint, fmt.Sprintf("mismatch in counter reset hint for histogram %d", i))
+					h := tc.histograms[i]
+					if value.IsStaleNaN(h.Sum) {
+						require.True(t, value.IsStaleNaN(decodedStats[i].Sum))
+						require.Equal(t, uint64(0), decodedStats[i].Count)
+					} else {
+						require.Equal(t, tc.histograms[i].Count, decodedStats[i].Count)
+						require.Equal(t, tc.histograms[i].Sum, decodedStats[i].Sum)
+					}
 				}
 			})
 			t.Run("float_histogram_stats", func(t *testing.T) {
 				decodedStats := make([]*histogram.FloatHistogram, 0)
-		statsIterator := NewHistogramStatsIterator(newHistogramSeries(histograms).Iterator(nil))
+				statsIterator := NewHistogramStatsIterator(newHistogramSeries(tc.histograms).Iterator(nil))
 				for statsIterator.Next() != chunkenc.ValNone {
 					_, h := statsIterator.AtFloatHistogram(nil)
 					decodedStats = append(decodedStats, h)
 				}
-		for i := 0; i < len(histograms); i++ {
-			fh := histograms[i].ToFloat(nil)
-			require.Equal(t, expectedHints[i], decodedStats[i].CounterResetHint)
+				for i := 0; i < len(tc.histograms); i++ {
+					require.Equal(t, tc.expectedHints[i], decodedStats[i].CounterResetHint)
+					fh := tc.histograms[i].ToFloat(nil)
+					if value.IsStaleNaN(fh.Sum) {
+						require.True(t, value.IsStaleNaN(decodedStats[i].Sum))
+						require.Equal(t, float64(0), decodedStats[i].Count)
+					} else {
 						require.Equal(t, fh.Count, decodedStats[i].Count)
 						require.Equal(t, fh.Sum, decodedStats[i].Sum)
 					}
+				}
 			})
+		})
+	}
 }
 
 type histogramSeries struct {

promql/parser/generated_parser.y

@@ -43,7 +43,6 @@ import (
     int         int64
     uint        uint64
     float       float64
-    duration    time.Duration
 }
 
 
@@ -85,6 +84,7 @@ NEGATIVE_BUCKETS_DESC
 ZERO_BUCKET_DESC
 ZERO_BUCKET_WIDTH_DESC
 CUSTOM_VALUES_DESC
+COUNTER_RESET_HINT_DESC
 %token histogramDescEnd
 
 // Operators.
@@ -150,6 +150,14 @@ START
 END
 %token preprocessorEnd
 
+// Counter reset hints.
+%token counterResetHintsStart
+%token <item>
+UNKNOWN_COUNTER_RESET
+COUNTER_RESET
+NOT_COUNTER_RESET
+GAUGE_TYPE
+%token counterResetHintsEnd
 
 // Start symbols for the generated parser.
 %token	startSymbolsStart
@@ -164,7 +172,7 @@ START_METRIC_SELECTOR
 // Type definitions for grammar rules.
 %type <matchers> label_match_list
 %type <matcher> label_matcher
-%type <item> aggregate_op grouping_label match_op maybe_label metric_identifier unary_op at_modifier_preprocessors string_identifier
+%type <item> aggregate_op grouping_label match_op maybe_label metric_identifier unary_op at_modifier_preprocessors string_identifier counter_reset_hint
 %type <labels> label_set metric
 %type <lblList> label_set_list
 %type <label> label_set_item
@@ -176,8 +184,7 @@ START_METRIC_SELECTOR
 %type <int> int
 %type <uint> uint
 %type <float> number series_value signed_number signed_or_unsigned_number
-%type <node> step_invariant_expr aggregate_expr aggregate_modifier bin_modifier binary_expr bool_modifier expr function_call function_call_args function_call_body group_modifiers label_matchers matrix_selector number_literal offset_expr on_or_ignoring paren_expr string_literal subquery_expr unary_expr vector_selector
-%type <duration> duration maybe_duration
+%type <node> step_invariant_expr aggregate_expr aggregate_modifier bin_modifier binary_expr bool_modifier expr function_call function_call_args function_call_body group_modifiers label_matchers matrix_selector number_duration_literal offset_expr on_or_ignoring paren_expr string_literal subquery_expr unary_expr vector_selector
 
 %start start
 
@@ -218,7 +225,7 @@ expr            :
                 | binary_expr
                 | function_call
                 | matrix_selector
-                | number_literal
+                | number_duration_literal
                 | offset_expr
                 | paren_expr
                 | string_literal
@@ -415,18 +422,22 @@ paren_expr      : LEFT_PAREN expr RIGHT_PAREN
  * Offset modifiers.
  */
 
-offset_expr: expr OFFSET duration
+offset_expr: expr OFFSET number_duration_literal
                         {
-                        yylex.(*parser).addOffset($1, $3)
+  		            numLit, _ := $3.(*NumberLiteral)
+      		            dur := time.Duration(numLit.Val * 1000) * time.Millisecond
+                 	    yylex.(*parser).addOffset($1, dur)
                             $$ = $1
                         }
-                | expr OFFSET SUB duration
+                | expr OFFSET SUB number_duration_literal
                         {
-                        yylex.(*parser).addOffset($1, -$4)
+			    numLit, _ := $4.(*NumberLiteral)
+		            dur := time.Duration(numLit.Val * 1000) * time.Millisecond
+			    yylex.(*parser).addOffset($1, -dur)
                             $$ = $1
                         }
                 | expr OFFSET error
-                        { yylex.(*parser).unexpected("offset", "duration"); $$ = $1 }
+                        { yylex.(*parser).unexpected("offset", "number or duration"); $$ = $1 }
                 ;
 /*
  * @ modifiers.
@@ -452,7 +463,7 @@ at_modifier_preprocessors: START | END;
  * Subquery and range selectors.
  */
 
-matrix_selector : expr LEFT_BRACKET duration RIGHT_BRACKET
+matrix_selector : expr LEFT_BRACKET number_duration_literal RIGHT_BRACKET
                         {
                         var errMsg string
                         vs, ok := $1.(*VectorSelector)
@@ -469,32 +480,44 @@ matrix_selector : expr LEFT_BRACKET duration RIGHT_BRACKET
                                 yylex.(*parser).addParseErrf(errRange, errMsg)
                         }
 
+			numLit, _ := $3.(*NumberLiteral)
                         $$ = &MatrixSelector{
                                 VectorSelector: $1.(Expr),
-                                Range: $3,
+                                Range: time.Duration(numLit.Val * 1000) * time.Millisecond,
                                 EndPos: yylex.(*parser).lastClosing,
                         }
                         }
                 ;
 
-subquery_expr   : expr LEFT_BRACKET duration COLON maybe_duration RIGHT_BRACKET
+subquery_expr   : expr LEFT_BRACKET number_duration_literal COLON number_duration_literal RIGHT_BRACKET
                         {
+			numLitRange, _ := $3.(*NumberLiteral)
+			numLitStep, _ := $5.(*NumberLiteral)
                         $$ = &SubqueryExpr{
                                 Expr:  $1.(Expr),
-                                Range: $3,
-                                Step:  $5,
-
+                                Range: time.Duration(numLitRange.Val * 1000) * time.Millisecond,
+                                Step:  time.Duration(numLitStep.Val * 1000) * time.Millisecond,
                                 EndPos: $6.Pos + 1,
                         }
                         }
-                | expr LEFT_BRACKET duration COLON duration error
+                | expr LEFT_BRACKET number_duration_literal COLON RIGHT_BRACKET
+		        {
+		          numLitRange, _ := $3.(*NumberLiteral)
+		          $$ = &SubqueryExpr{
+		          Expr:  $1.(Expr),
+		          Range: time.Duration(numLitRange.Val * 1000) * time.Millisecond,
+		          Step:  0,
+		          EndPos: $5.Pos + 1,
+		          }
+		        }
+                | expr LEFT_BRACKET number_duration_literal COLON number_duration_literal error
                         { yylex.(*parser).unexpected("subquery selector", "\"]\""); $$ = $1 }
-                | expr LEFT_BRACKET duration COLON error
-                        { yylex.(*parser).unexpected("subquery selector", "duration or \"]\""); $$ = $1 }
-                | expr LEFT_BRACKET duration error
+                | expr LEFT_BRACKET number_duration_literal COLON error
+                        { yylex.(*parser).unexpected("subquery selector", "number or duration or \"]\""); $$ = $1 }
+                | expr LEFT_BRACKET number_duration_literal error
                         { yylex.(*parser).unexpected("subquery or range", "\":\" or \"]\""); $$ = $1 }
                 | expr LEFT_BRACKET error
-                        { yylex.(*parser).unexpected("subquery selector", "duration"); $$ = $1 }
+		        { yylex.(*parser).unexpected("subquery selector", "number or duration"); $$ = $1 }
                 ;
 
 /*
@@ -825,6 +848,11 @@ histogram_desc_item
                    $$ = yylex.(*parser).newMap()
                    $$["n_offset"] = $3
                 }
+                | COUNTER_RESET_HINT_DESC COLON counter_reset_hint
+                {
+                   $$ = yylex.(*parser).newMap()
+                   $$["counter_reset_hint"] = $3
+                }
                 ;
 
 bucket_set      : LEFT_BRACKET bucket_set_list SPACE RIGHT_BRACKET
@@ -848,6 +876,7 @@ bucket_set_list : bucket_set_list SPACE number
                 | bucket_set_list error
                 ;
 
+counter_reset_hint : UNKNOWN_COUNTER_RESET | COUNTER_RESET | NOT_COUNTER_RESET | GAUGE_TYPE;
 
 /*
  * Keyword lists.
@@ -866,16 +895,43 @@ match_op        : EQL | NEQ | EQL_REGEX | NEQ_REGEX ;
  * Literals.
  */
 
-number_literal  : NUMBER
+number_duration_literal  : NUMBER
                         {
                             $$ = &NumberLiteral{
                                 Val:           yylex.(*parser).number($1.Val),
                                 PosRange: $1.PositionRange(),
                             }
                         }
+                        | DURATION
+			{
+                            var err error
+                            var dur time.Duration
+                            dur, err = parseDuration($1.Val)
+                            if err != nil {
+                                    yylex.(*parser).addParseErr($1.PositionRange(), err)
+                            }
+                            $$ = &NumberLiteral{
+			            Val:      dur.Seconds(),
+			            PosRange: $1.PositionRange(),
+                            }
+                        }
                 ;
 
-number          : NUMBER { $$ = yylex.(*parser).number($1.Val) } ;
+number          : NUMBER
+                {
+		  $$ = yylex.(*parser).number($1.Val)
+		}
+                | DURATION
+		{
+		  var err error
+		  var dur time.Duration
+		  dur, err = parseDuration($1.Val)
+		  if err != nil {
+		      yylex.(*parser).addParseErr($1.PositionRange(), err)
+		  }
+		  $$ = dur.Seconds()
+		}
+                ;
 
 signed_number   : ADD number { $$ = $2 }
                 | SUB number { $$ = -$2 }
@@ -897,17 +953,6 @@ int             : SUB uint { $$ = -int64($2) }
                 | uint { $$ = int64($1) }
                 ;
 
-duration        : DURATION
-                        {
-                        var err error
-                        $$, err = parseDuration($1.Val)
-                        if err != nil {
-                                yylex.(*parser).addParseErr($1.PositionRange(), err)
-                        }
-                        }
-                ;
-
-
 string_literal  : STRING
                         {
                         $$ = &StringLiteral{
@@ -931,11 +976,6 @@ string_identifier  : STRING
  * Wrappers for optional arguments.
  */
 
-maybe_duration  : /* empty */
-                        {$$ = 0}
-                | duration
-                ;
-
 maybe_grouping_labels: /* empty */ { $$ = nil }
                 | grouping_labels
                 ;

promql/parser/lex.go

@@ -147,6 +147,14 @@ var histogramDesc = map[string]ItemType{
 	"z_bucket":           ZERO_BUCKET_DESC,
 	"z_bucket_w":         ZERO_BUCKET_WIDTH_DESC,
 	"custom_values":      CUSTOM_VALUES_DESC,
+	"counter_reset_hint": COUNTER_RESET_HINT_DESC,
+}
+
+var counterResetHints = map[string]ItemType{
+	"unknown":   UNKNOWN_COUNTER_RESET,
+	"reset":     COUNTER_RESET,
+	"not_reset": NOT_COUNTER_RESET,
+	"gauge":     GAUGE_TYPE,
 }
 
 // ItemTypeStr is the default string representations for common Items. It does not
@@ -478,7 +486,7 @@ func lexStatements(l *Lexer) stateFn {
 			skipSpaces(l)
 		}
 		l.bracketOpen = true
-		return lexDuration
+		return lexNumberOrDuration
 	case r == ']':
 		if !l.bracketOpen {
 			return l.errorf("unexpected right bracket %q", r)
@@ -585,6 +593,11 @@ Loop:
 					return lexHistogram
 				}
 			}
+			if desc, ok := counterResetHints[strings.ToLower(word)]; ok {
+				l.emit(desc)
+				return lexHistogram
+			}
+
 			l.errorf("bad histogram descriptor found: %q", word)
 			break Loop
 		}
@@ -846,18 +859,6 @@ func lexLineComment(l *Lexer) stateFn {
 	return lexStatements
 }
 
-func lexDuration(l *Lexer) stateFn {
-	if l.scanNumber() {
-		return l.errorf("missing unit character in duration")
-	}
-	if !acceptRemainingDuration(l) {
-		return l.errorf("bad duration syntax: %q", l.input[l.start:l.pos])
-	}
-	l.backup()
-	l.emit(DURATION)
-	return lexStatements
-}
-
 // lexNumber scans a number: decimal, hex, oct or float.
 func lexNumber(l *Lexer) stateFn {
 	if !l.scanNumber() {
@@ -909,6 +910,7 @@ func acceptRemainingDuration(l *Lexer) bool {
 // scanNumber scans numbers of different formats. The scanned Item is
 // not necessarily a valid number. This case is caught by the parser.
 func (l *Lexer) scanNumber() bool {
+	initialPos := l.pos
 	// Modify the digit pattern if the number is hexadecimal.
 	digitPattern := "0123456789"
 	// Disallow hexadecimal in series descriptions as the syntax is ambiguous.
@@ -980,7 +982,10 @@ func (l *Lexer) scanNumber() bool {
 		// Handle digits at the end since we already consumed before this loop.
 		l.acceptRun(digitPattern)
 	}
-
+	// Empty string is not a valid number.
+	if l.pos == initialPos {
+		return false
+	}
 	// Next thing must not be alphanumeric unless it's the times token
 	// for series repetitions.
 	if r := l.peek(); (l.seriesDesc && r == 'x') || !isAlphaNumeric(r) {

promql/parser/parse.go

@@ -580,6 +580,28 @@ func (p *parser) buildHistogramFromMap(desc *map[string]interface{}) *histogram.
 		}
 	}
 
+	val, ok = (*desc)["counter_reset_hint"]
+	if ok {
+		resetHint, ok := val.(Item)
+
+		if ok {
+			switch resetHint.Typ {
+			case UNKNOWN_COUNTER_RESET:
+				output.CounterResetHint = histogram.UnknownCounterReset
+			case COUNTER_RESET:
+				output.CounterResetHint = histogram.CounterReset
+			case NOT_COUNTER_RESET:
+				output.CounterResetHint = histogram.NotCounterReset
+			case GAUGE_TYPE:
+				output.CounterResetHint = histogram.GaugeType
+			default:
+				p.addParseErrf(p.yyParser.lval.item.PositionRange(), "error parsing counter_reset_hint: unknown value %v", resetHint.Typ)
+			}
+		} else {
+			p.addParseErrf(p.yyParser.lval.item.PositionRange(), "error parsing counter_reset_hint: %v", val)
+		}
+	}
+
 	buckets, spans := p.buildHistogramBucketsAndSpans(desc, "buckets", "offset")
 	output.PositiveBuckets = buckets
 	output.PositiveSpans = spans

promql/parser/parse_test.go

@@ -2133,6 +2133,115 @@ var testExpr = []struct {
 			EndPos: 25,
 		},
 	},
+	{
+		input: `test{a="b"}[5m] OFFSET 3600`,
+		expected: &MatrixSelector{
+			VectorSelector: &VectorSelector{
+				Name:           "test",
+				OriginalOffset: 1 * time.Hour,
+				LabelMatchers: []*labels.Matcher{
+					MustLabelMatcher(labels.MatchEqual, "a", "b"),
+					MustLabelMatcher(labels.MatchEqual, model.MetricNameLabel, "test"),
+				},
+				PosRange: posrange.PositionRange{
+					Start: 0,
+					End:   11,
+				},
+			},
+			Range:  5 * time.Minute,
+			EndPos: 27,
+		},
+	},
+	{
+		input: `foo[3ms] @ 2.345`,
+		expected: &MatrixSelector{
+			VectorSelector: &VectorSelector{
+				Name:      "foo",
+				Timestamp: makeInt64Pointer(2345),
+				LabelMatchers: []*labels.Matcher{
+					MustLabelMatcher(labels.MatchEqual, model.MetricNameLabel, "foo"),
+				},
+				PosRange: posrange.PositionRange{
+					Start: 0,
+					End:   3,
+				},
+			},
+			Range:  3 * time.Millisecond,
+			EndPos: 16,
+		},
+	},
+	{
+		input: `foo[4s180ms] @ 2.345`,
+		expected: &MatrixSelector{
+			VectorSelector: &VectorSelector{
+				Name:      "foo",
+				Timestamp: makeInt64Pointer(2345),
+				LabelMatchers: []*labels.Matcher{
+					MustLabelMatcher(labels.MatchEqual, model.MetricNameLabel, "foo"),
+				},
+				PosRange: posrange.PositionRange{
+					Start: 0,
+					End:   3,
+				},
+			},
+			Range:  4*time.Second + 180*time.Millisecond,
+			EndPos: 20,
+		},
+	},
+	{
+		input: `foo[4.18] @ 2.345`,
+		expected: &MatrixSelector{
+			VectorSelector: &VectorSelector{
+				Name:      "foo",
+				Timestamp: makeInt64Pointer(2345),
+				LabelMatchers: []*labels.Matcher{
+					MustLabelMatcher(labels.MatchEqual, model.MetricNameLabel, "foo"),
+				},
+				PosRange: posrange.PositionRange{
+					Start: 0,
+					End:   3,
+				},
+			},
+			Range:  4*time.Second + 180*time.Millisecond,
+			EndPos: 17,
+		},
+	},
+	{
+		input: `foo[4s18ms] @ 2.345`,
+		expected: &MatrixSelector{
+			VectorSelector: &VectorSelector{
+				Name:      "foo",
+				Timestamp: makeInt64Pointer(2345),
+				LabelMatchers: []*labels.Matcher{
+					MustLabelMatcher(labels.MatchEqual, model.MetricNameLabel, "foo"),
+				},
+				PosRange: posrange.PositionRange{
+					Start: 0,
+					End:   3,
+				},
+			},
+			Range:  4*time.Second + 18*time.Millisecond,
+			EndPos: 19,
+		},
+	},
+	{
+		input: `foo[4.018] @ 2.345`,
+		expected: &MatrixSelector{
+			VectorSelector: &VectorSelector{
+				Name:      "foo",
+				Timestamp: makeInt64Pointer(2345),
+				LabelMatchers: []*labels.Matcher{
+					MustLabelMatcher(labels.MatchEqual, model.MetricNameLabel, "foo"),
+				},
+				PosRange: posrange.PositionRange{
+					Start: 0,
+					End:   3,
+				},
+			},
+			Range:  4*time.Second + 18*time.Millisecond,
+			EndPos: 18,
+		},
+	},
 	{
 		input: `test{a="b"}[5y] @ 1603774699`,
 		expected: &MatrixSelector{
@@ -2152,15 +2261,50 @@ var testExpr = []struct {
 			EndPos: 28,
 		},
 	},
+	{
+		input: "test[5]",
+		expected: &MatrixSelector{
+			VectorSelector: &VectorSelector{
+				Name: "test",
+				LabelMatchers: []*labels.Matcher{
+					MustLabelMatcher(labels.MatchEqual, model.MetricNameLabel, "test"),
+				},
+				PosRange: posrange.PositionRange{
+					Start: 0,
+					End:   4,
+				},
+			},
+			Range:  5 * time.Second,
+			EndPos: 7,
+		},
+	},
+	{
+		input: `some_metric[5m] @ 1m`,
+		expected: &MatrixSelector{
+			VectorSelector: &VectorSelector{
+				Name:      "some_metric",
+				Timestamp: makeInt64Pointer(60000),
+				LabelMatchers: []*labels.Matcher{
+					MustLabelMatcher(labels.MatchEqual, model.MetricNameLabel, "some_metric"),
+				},
+				PosRange: posrange.PositionRange{
+					Start: 0,
+					End:   11,
+				},
+			},
+			Range:  5 * time.Minute,
+			EndPos: 20,
+		},
+	},
 	{
 		input:  `foo[5mm]`,
 		fail:   true,
-		errMsg: "bad duration syntax: \"5mm\"",
+		errMsg: "bad number or duration syntax: \"5mm\"",
 	},
 	{
 		input:  `foo[5m1]`,
 		fail:   true,
-		errMsg: "bad duration syntax: \"5m1\"",
+		errMsg: "bad number or duration syntax: \"5m1\"",
 	},
 	{
 		input:  `foo[5m:1m1]`,
@@ -2194,17 +2338,12 @@ var testExpr = []struct {
 	{
 		input:  `foo[]`,
 		fail:   true,
-		errMsg: "missing unit character in duration",
+		errMsg: "bad number or duration syntax: \"\"",
 	},
 	{
-		input:  `foo[1]`,
+		input:  `foo[-1]`,
 		fail:   true,
-		errMsg: "missing unit character in duration",
-	},
-	{
-		input:  `some_metric[5m] OFFSET 1`,
-		fail:   true,
-		errMsg: "unexpected number \"1\" in offset, expected duration",
+		errMsg: "bad number or duration syntax: \"\"",
 	},
 	{
 		input:  `some_metric[5m] OFFSET 1mm`,
@@ -2214,18 +2353,13 @@ var testExpr = []struct {
 	{
 		input:  `some_metric[5m] OFFSET`,
 		fail:   true,
-		errMsg: "unexpected end of input in offset, expected duration",
+		errMsg: "unexpected end of input in offset, expected number or duration",
 	},
 	{
 		input:  `some_metric OFFSET 1m[5m]`,
 		fail:   true,
 		errMsg: "1:22: parse error: no offset modifiers allowed before range",
 	},
-	{
-		input:  `some_metric[5m] @ 1m`,
-		fail:   true,
-		errMsg: "1:19: parse error: unexpected duration \"1m\" in @, expected timestamp",
-	},
 	{
 		input:  `some_metric[5m] @`,
 		fail:   true,
@@ -2910,6 +3044,11 @@ var testExpr = []struct {
 		errMsg: "illegal character U+002E '.' in escape sequence",
 	},
 	// Subquery.
+	{
+		input:  `foo{bar="baz"}[`,
+		fail:   true,
+		errMsg: `1:16: parse error: bad number or duration syntax: ""`,
+	},
 	{
 		input: `foo{bar="baz"}[10m:6s]`,
 		expected: &SubqueryExpr{
@@ -3899,7 +4038,7 @@ func TestParseHistogramSeries(t *testing.T) {
 		},
 		{
 			name:  "all properties used",
-			input: `{} {{schema:1 sum:-0.3 count:3.1 z_bucket:7.1 z_bucket_w:0.05 buckets:[5.1 10 7] offset:-3 n_buckets:[4.1 5] n_offset:-5}}`,
+			input: `{} {{schema:1 sum:-0.3 count:3.1 z_bucket:7.1 z_bucket_w:0.05 buckets:[5.1 10 7] offset:-3 n_buckets:[4.1 5] n_offset:-5 counter_reset_hint:gauge}}`,
 			expected: []histogram.FloatHistogram{{
 				Schema:           1,
 				Sum:              -0.3,
@@ -3910,11 +4049,12 @@ func TestParseHistogramSeries(t *testing.T) {
 				PositiveSpans:    []histogram.Span{{Offset: -3, Length: 3}},
 				NegativeBuckets:  []float64{4.1, 5},
 				NegativeSpans:    []histogram.Span{{Offset: -5, Length: 2}},
+				CounterResetHint: histogram.GaugeType,
 			}},
 		},
 		{
 			name:  "all properties used - with spaces",
-			input: `{} {{schema:1  sum:0.3  count:3  z_bucket:7 z_bucket_w:5 buckets:[5 10  7  ] offset:-3  n_buckets:[4 5]  n_offset:5  }}`,
+			input: `{} {{schema:1  sum:0.3  count:3  z_bucket:7 z_bucket_w:5 buckets:[5 10  7  ] offset:-3  n_buckets:[4 5]  n_offset:5  counter_reset_hint:gauge  }}`,
 			expected: []histogram.FloatHistogram{{
 				Schema:           1,
 				Sum:              0.3,
@@ -3925,6 +4065,7 @@ func TestParseHistogramSeries(t *testing.T) {
 				PositiveSpans:    []histogram.Span{{Offset: -3, Length: 3}},
 				NegativeBuckets:  []float64{4, 5},
 				NegativeSpans:    []histogram.Span{{Offset: 5, Length: 2}},
+				CounterResetHint: histogram.GaugeType,
 			}},
 		},
 		{
@@ -4111,6 +4252,39 @@ func TestParseHistogramSeries(t *testing.T) {
 			input:         `{} {{ schema:1}}`,
 			expectedError: `1:7: parse error: unexpected "<Item 57372>" "schema" in series values`,
 		},
+		{
+			name:          "invalid counter reset hint value",
+			input:         `{} {{counter_reset_hint:foo}}`,
+			expectedError: `1:25: parse error: bad histogram descriptor found: "foo"`,
+		},
+		{
+			name:  "'unknown' counter reset hint value",
+			input: `{} {{counter_reset_hint:unknown}}`,
+			expected: []histogram.FloatHistogram{{
+				CounterResetHint: histogram.UnknownCounterReset,
+			}},
+		},
+		{
+			name:  "'reset' counter reset hint value",
+			input: `{} {{counter_reset_hint:reset}}`,
+			expected: []histogram.FloatHistogram{{
+				CounterResetHint: histogram.CounterReset,
+			}},
+		},
+		{
+			name:  "'not_reset' counter reset hint value",
+			input: `{} {{counter_reset_hint:not_reset}}`,
+			expected: []histogram.FloatHistogram{{
+				CounterResetHint: histogram.NotCounterReset,
+			}},
+		},
+		{
+			name:  "'gauge' counter reset hint value",
+			input: `{} {{counter_reset_hint:gauge}}`,
+			expected: []histogram.FloatHistogram{{
+				CounterResetHint: histogram.GaugeType,
+			}},
+		},
 	} {
 		t.Run(test.name, func(t *testing.T) {
 			_, vals, err := ParseSeriesDesc(test.input)

promql/promqltest/test.go

@@ -55,6 +55,11 @@ const (
 	DefaultMaxSamplesPerQuery = 10000
 )
 
+type TBRun interface {
+	testing.TB
+	Run(string, func(*testing.T)) bool
+}
+
 var testStartTime = time.Unix(0, 0).UTC()
 
 // LoadedStorage returns storage with generated data using the provided load statements.
@@ -89,7 +94,7 @@ func NewTestEngine(enablePerStepStats bool, lookbackDelta time.Duration, maxSamp
 }
 
 // RunBuiltinTests runs an acceptance test suite against the provided engine.
-func RunBuiltinTests(t *testing.T, engine promql.QueryEngine) {
+func RunBuiltinTests(t TBRun, engine promql.QueryEngine) {
 	t.Cleanup(func() { parser.EnableExperimentalFunctions = false })
 	parser.EnableExperimentalFunctions = true
 

promql/promqltest/testdata/at_modifier.test

@@ -10,22 +10,54 @@ eval instant at 10s metric @ 100
   metric{job="1"} 10
   metric{job="2"} 20
 
+eval instant at 10s metric @ 100s
+  metric{job="1"} 10
+  metric{job="2"} 20
+
+eval instant at 10s metric @ 1m40s
+  metric{job="1"} 10
+  metric{job="2"} 20
+
 eval instant at 10s metric @ 100 offset 50s
   metric{job="1"} 5
   metric{job="2"} 10
 
+eval instant at 10s metric @ 100 offset 50
+  metric{job="1"} 5
+  metric{job="2"} 10
+
 eval instant at 10s metric offset 50s @ 100
   metric{job="1"} 5
   metric{job="2"} 10
 
+eval instant at 10s metric offset 50 @ 100
+  metric{job="1"} 5
+  metric{job="2"} 10
+
 eval instant at 10s metric @ 0 offset -50s
   metric{job="1"} 5
   metric{job="2"} 10
 
+eval instant at 10s metric @ 0 offset -50
+  metric{job="1"} 5
+  metric{job="2"} 10
+
 eval instant at 10s metric offset -50s @ 0
   metric{job="1"} 5
   metric{job="2"} 10
 
+eval instant at 10s metric offset -50 @ 0
+  metric{job="1"} 5
+  metric{job="2"} 10
+
+eval instant at 10s metric @ 0 offset -50s
+  metric{job="1"} 5
+  metric{job="2"} 10
+
+eval instant at 10s metric @ 0 offset -50
+  metric{job="1"} 5
+  metric{job="2"} 10
+
 eval instant at 10s -metric @ 100
   {job="1"} -10
   {job="2"} -20
@@ -48,6 +80,12 @@ eval instant at 25s sum_over_time(metric{job="1"}[100s] @ 100 offset 50s)
 eval instant at 25s sum_over_time(metric{job="1"}[100s] offset 50s @ 100)
   {job="1"} 15
 
+eval instant at 25s sum_over_time(metric{job="1"}[100] @ 100 offset 50)
+  {job="1"} 15
+
+eval instant at 25s sum_over_time(metric{job="1"}[100] offset 50s @ 100)
+  {job="1"} 15
+
 # Different timestamps.
 eval instant at 25s metric{job="1"} @ 50 + metric{job="1"} @ 100
   {job="1"} 15
@@ -58,6 +96,9 @@ eval instant at 25s rate(metric{job="1"}[100s] @ 100) + label_replace(rate(metri
 eval instant at 25s sum_over_time(metric{job="1"}[100s] @ 100) + label_replace(sum_over_time(metric{job="2"}[100s] @ 100), "job", "1", "", "")
   {job="1"} 165
 
+eval instant at 25s sum_over_time(metric{job="1"}[100] @ 100) + label_replace(sum_over_time(metric{job="2"}[100] @ 100), "job", "1", "", "")
+  {job="1"} 165
+
 # Subqueries.
 
 # 10*(1+2+...+9) + 10.
@@ -72,6 +113,10 @@ eval instant at 25s sum_over_time(metric{job="1"}[100s:1s] @ 100 offset 20s)
 eval instant at 25s sum_over_time(metric{job="1"}[100s:1s] offset 20s @ 100)
   {job="1"} 288
 
+# 10*(1+2+...+7) + 8.
+eval instant at 25s sum_over_time(metric{job="1"}[100:1] offset 20 @ 100)
+  {job="1"} 288
+
 # Subquery with different timestamps.
 
 # Since vector selector has timestamp, the result value does not depend on the timestamp of subqueries.

promql/promqltest/testdata/functions.test

@@ -10,6 +10,11 @@ eval instant at 50m resets(http_requests[5m])
 	{path="/bar"} 0
 	{path="/biz"} 0
 
+eval instant at 50m resets(http_requests[300])
+	{path="/foo"} 0
+	{path="/bar"} 0
+	{path="/biz"} 0
+
 eval instant at 50m resets(http_requests[20m])
 	{path="/foo"} 1
 	{path="/bar"} 0
@@ -239,10 +244,16 @@ eval instant at 50m deriv(testcounter_reset_middle[100m])
 eval instant at 50m predict_linear(testcounter_reset_middle[50m], 3600)
 	{} 76.81818181818181
 
+eval instant at 50m predict_linear(testcounter_reset_middle[50m], 1h)
+	{} 76.81818181818181
+
 # intercept at t = 3000+3600 = 6600
 eval instant at 50m predict_linear(testcounter_reset_middle[50m] @ 3000, 3600)
 	{} 76.81818181818181
 
+eval instant at 50m predict_linear(testcounter_reset_middle[50m] @ 3000, 1h)
+	{} 76.81818181818181
+
 # intercept at t = 600+3600 = 4200
 eval instant at 10m predict_linear(testcounter_reset_middle[50m] @ 3000, 3600)
 	{} 51.36363636363637

promql/promqltest/testdata/histograms.test

@@ -73,22 +73,32 @@ eval instant at 50m histogram_count(testhistogram3)
 	{start="positive"} 110
 	{start="negative"} 20
 
+# Classic way of accessing the count still works.
+eval instant at 50m testhistogram3_count
+	testhistogram3_count{start="positive"} 110
+	testhistogram3_count{start="negative"} 20
+
 # Test histogram_sum.
 eval instant at 50m histogram_sum(testhistogram3)
 	{start="positive"} 330
 	{start="negative"} 80
 
-# Test histogram_avg.
+# Classic way of accessing the sum still works.
+eval instant at 50m testhistogram3_sum
+	testhistogram3_sum{start="positive"} 330
+	testhistogram3_sum{start="negative"} 80
+
+# Test histogram_avg. This has no classic equivalent.
 eval instant at 50m histogram_avg(testhistogram3)
 	{start="positive"} 3
 	{start="negative"} 4
 
-# Test histogram_stddev.
+# Test histogram_stddev. This has no classic equivalent.
 eval instant at 50m histogram_stddev(testhistogram3)
 	{start="positive"} 2.8189265757336734
 	{start="negative"} 4.182715937754936
 
-# Test histogram_stdvar.
+# Test histogram_stdvar. This has no classic equivalent.
 eval instant at 50m histogram_stdvar(testhistogram3)
 	{start="positive"} 7.946347039377573
 	{start="negative"} 17.495112615949154
@@ -103,137 +113,282 @@ eval instant at 50m histogram_fraction(0, 0.2, rate(testhistogram3[5m]))
 	{start="positive"} 0.6363636363636364
 	{start="negative"} 0
 
-# Test histogram_quantile.
+# In the classic histogram, we can access the corresponding bucket (if
+# it exists) and divide by the count to get the same result.
+
+eval instant at 50m testhistogram3_bucket{le=".2"} / ignoring(le) testhistogram3_count
+	{start="positive"} 0.6363636363636364
+	
+eval instant at 50m rate(testhistogram3_bucket{le=".2"}[5m]) / ignoring(le) rate(testhistogram3_count[5m])
+	{start="positive"} 0.6363636363636364
+
+# Test histogram_quantile, native and classic.
+
+eval instant at 50m histogram_quantile(0, testhistogram3)
+	{start="positive"} 0
+	{start="negative"} -0.25
 
 eval instant at 50m histogram_quantile(0, testhistogram3_bucket)
 	{start="positive"} 0
 	{start="negative"} -0.25
 
+eval instant at 50m histogram_quantile(0.25, testhistogram3)
+	{start="positive"} 0.055
+	{start="negative"} -0.225
+
 eval instant at 50m histogram_quantile(0.25, testhistogram3_bucket)
 	{start="positive"} 0.055
 	{start="negative"} -0.225
 
+eval instant at 50m histogram_quantile(0.5, testhistogram3)
+	{start="positive"} 0.125
+	{start="negative"} -0.2
+
 eval instant at 50m histogram_quantile(0.5, testhistogram3_bucket)
 	{start="positive"} 0.125
 	{start="negative"} -0.2
 
+eval instant at 50m histogram_quantile(0.75, testhistogram3)
+	{start="positive"} 0.45
+	{start="negative"} -0.15
+
 eval instant at 50m histogram_quantile(0.75, testhistogram3_bucket)
 	{start="positive"} 0.45
 	{start="negative"} -0.15
 
+eval instant at 50m histogram_quantile(1, testhistogram3)
+	{start="positive"} 1
+	{start="negative"} -0.1
+
 eval instant at 50m histogram_quantile(1, testhistogram3_bucket)
 	{start="positive"} 1
 	{start="negative"} -0.1
 
 # Quantile too low.
+
+eval_warn instant at 50m histogram_quantile(-0.1, testhistogram)
+	{start="positive"} -Inf
+	{start="negative"} -Inf
+
 eval_warn instant at 50m histogram_quantile(-0.1, testhistogram_bucket)
 	{start="positive"} -Inf
 	{start="negative"} -Inf
 
 # Quantile too high.
+
+eval_warn instant at 50m histogram_quantile(1.01, testhistogram)
+	{start="positive"} +Inf
+	{start="negative"} +Inf
+
 eval_warn instant at 50m histogram_quantile(1.01, testhistogram_bucket)
 	{start="positive"} +Inf
 	{start="negative"} +Inf
 
 # Quantile invalid.
+
+eval_warn instant at 50m histogram_quantile(NaN, testhistogram)
+	{start="positive"} NaN
+	{start="negative"} NaN
+
 eval_warn instant at 50m histogram_quantile(NaN, testhistogram_bucket)
 	{start="positive"} NaN
 	{start="negative"} NaN
 
 # Quantile value in lowest bucket.
+
+eval instant at 50m histogram_quantile(0, testhistogram)
+	{start="positive"} 0
+	{start="negative"} -0.2
+
 eval instant at 50m histogram_quantile(0, testhistogram_bucket)
 	{start="positive"} 0
 	{start="negative"} -0.2
 
 # Quantile value in highest bucket.
+
+eval instant at 50m histogram_quantile(1, testhistogram)
+	{start="positive"} 1
+	{start="negative"} 0.3
+
 eval instant at 50m histogram_quantile(1, testhistogram_bucket)
 	{start="positive"} 1
 	{start="negative"} 0.3
 
 # Finally some useful quantiles.
+
+eval instant at 50m histogram_quantile(0.2, testhistogram)
+	{start="positive"} 0.048
+	{start="negative"} -0.2
+
 eval instant at 50m histogram_quantile(0.2, testhistogram_bucket)
 	{start="positive"} 0.048
 	{start="negative"} -0.2
 
+eval instant at 50m histogram_quantile(0.5, testhistogram)
+	{start="positive"} 0.15
+	{start="negative"} -0.15
+
 eval instant at 50m histogram_quantile(0.5, testhistogram_bucket)
 	{start="positive"} 0.15
 	{start="negative"} -0.15
 
+eval instant at 50m histogram_quantile(0.8, testhistogram)
+	{start="positive"} 0.72
+	{start="negative"} 0.3
+
 eval instant at 50m histogram_quantile(0.8, testhistogram_bucket)
 	{start="positive"} 0.72
 	{start="negative"} 0.3
 
 # More realistic with rates.
+
+eval instant at 50m histogram_quantile(0.2, rate(testhistogram[5m]))
+	{start="positive"} 0.048
+	{start="negative"} -0.2
+
 eval instant at 50m histogram_quantile(0.2, rate(testhistogram_bucket[5m]))
 	{start="positive"} 0.048
 	{start="negative"} -0.2
 
+eval instant at 50m histogram_quantile(0.5, rate(testhistogram[5m]))
+	{start="positive"} 0.15
+	{start="negative"} -0.15
+
 eval instant at 50m histogram_quantile(0.5, rate(testhistogram_bucket[5m]))
 	{start="positive"} 0.15
 	{start="negative"} -0.15
 
+eval instant at 50m histogram_quantile(0.8, rate(testhistogram[5m]))
+	{start="positive"} 0.72
+	{start="negative"} 0.3
+
 eval instant at 50m histogram_quantile(0.8, rate(testhistogram_bucket[5m]))
 	{start="positive"} 0.72
 	{start="negative"} 0.3
 
 # Want results exactly in the middle of the bucket.
+
+eval instant at 7m histogram_quantile(1./6., testhistogram2)
+	{} 1
+
 eval instant at 7m histogram_quantile(1./6., testhistogram2_bucket)
 	{} 1
 
+eval instant at 7m histogram_quantile(0.5, testhistogram2)
+	{} 3
+
 eval instant at 7m histogram_quantile(0.5, testhistogram2_bucket)
 	{} 3
 
+eval instant at 7m histogram_quantile(5./6., testhistogram2)
+	{} 5
+
 eval instant at 7m histogram_quantile(5./6., testhistogram2_bucket)
 	{} 5
 
+eval instant at 47m histogram_quantile(1./6., rate(testhistogram2[15m]))
+	{} 1
+
 eval instant at 47m histogram_quantile(1./6., rate(testhistogram2_bucket[15m]))
 	{} 1
 
+eval instant at 47m histogram_quantile(0.5, rate(testhistogram2[15m]))
+	{} 3
+
 eval instant at 47m histogram_quantile(0.5, rate(testhistogram2_bucket[15m]))
 	{} 3
 
+eval instant at 47m histogram_quantile(5./6., rate(testhistogram2[15m]))
+	{} 5
+
 eval instant at 47m histogram_quantile(5./6., rate(testhistogram2_bucket[15m]))
 	{} 5
 
-# Aggregated histogram: Everything in one.
+# Aggregated histogram: Everything in one. Note how native histograms
+# don't require aggregation by le.
+
+eval instant at 50m histogram_quantile(0.3, sum(rate(request_duration_seconds[5m])))
+	{} 0.075
+
 eval instant at 50m histogram_quantile(0.3, sum(rate(request_duration_seconds_bucket[5m])) by (le))
 	{} 0.075
 
+eval instant at 50m histogram_quantile(0.5, sum(rate(request_duration_seconds[5m])))
+	{} 0.1277777777777778
+
 eval instant at 50m histogram_quantile(0.5, sum(rate(request_duration_seconds_bucket[5m])) by (le))
 	{} 0.1277777777777778
 
 # Aggregated histogram: Everything in one. Now with avg, which does not change anything.
+
+eval instant at 50m histogram_quantile(0.3, avg(rate(request_duration_seconds[5m])))
+	{} 0.075
+
 eval instant at 50m histogram_quantile(0.3, avg(rate(request_duration_seconds_bucket[5m])) by (le))
 	{} 0.075
 
+eval instant at 50m histogram_quantile(0.5, avg(rate(request_duration_seconds[5m])))
+	{} 0.12777777777777778
+
 eval instant at 50m histogram_quantile(0.5, avg(rate(request_duration_seconds_bucket[5m])) by (le))
 	{} 0.12777777777777778
 
 # Aggregated histogram: By instance.
+
+eval instant at 50m histogram_quantile(0.3, sum(rate(request_duration_seconds[5m])) by (instance))
+	{instance="ins1"} 0.075
+	{instance="ins2"} 0.075
+
 eval instant at 50m histogram_quantile(0.3, sum(rate(request_duration_seconds_bucket[5m])) by (le, instance))
 	{instance="ins1"} 0.075
 	{instance="ins2"} 0.075
 
+eval instant at 50m histogram_quantile(0.5, sum(rate(request_duration_seconds[5m])) by (instance))
+	{instance="ins1"} 0.1333333333
+	{instance="ins2"} 0.125
+
 eval instant at 50m histogram_quantile(0.5, sum(rate(request_duration_seconds_bucket[5m])) by (le, instance))
 	{instance="ins1"} 0.1333333333
 	{instance="ins2"} 0.125
 
 # Aggregated histogram: By job.
+
+eval instant at 50m histogram_quantile(0.3, sum(rate(request_duration_seconds[5m])) by (job))
+	{job="job1"} 0.1
+	{job="job2"} 0.0642857142857143
+
 eval instant at 50m histogram_quantile(0.3, sum(rate(request_duration_seconds_bucket[5m])) by (le, job))
 	{job="job1"} 0.1
 	{job="job2"} 0.0642857142857143
 
+eval instant at 50m histogram_quantile(0.5, sum(rate(request_duration_seconds[5m])) by (job))
+	{job="job1"} 0.14
+	{job="job2"} 0.1125
+
 eval instant at 50m histogram_quantile(0.5, sum(rate(request_duration_seconds_bucket[5m])) by (le, job))
 	{job="job1"} 0.14
 	{job="job2"} 0.1125
 
 # Aggregated histogram: By job and instance.
+
+eval instant at 50m histogram_quantile(0.3, sum(rate(request_duration_seconds[5m])) by (job, instance))
+	{instance="ins1", job="job1"} 0.11
+	{instance="ins2", job="job1"} 0.09
+	{instance="ins1", job="job2"} 0.06
+	{instance="ins2", job="job2"} 0.0675
+
 eval instant at 50m histogram_quantile(0.3, sum(rate(request_duration_seconds_bucket[5m])) by (le, job, instance))
 	{instance="ins1", job="job1"} 0.11
 	{instance="ins2", job="job1"} 0.09
 	{instance="ins1", job="job2"} 0.06
 	{instance="ins2", job="job2"} 0.0675
 
+eval instant at 50m histogram_quantile(0.5, sum(rate(request_duration_seconds[5m])) by (job, instance))
+	{instance="ins1", job="job1"} 0.15
+	{instance="ins2", job="job1"} 0.1333333333333333
+	{instance="ins1", job="job2"} 0.1
+	{instance="ins2", job="job2"} 0.1166666666666667
+
 eval instant at 50m histogram_quantile(0.5, sum(rate(request_duration_seconds_bucket[5m])) by (le, job, instance))
 	{instance="ins1", job="job1"} 0.15
 	{instance="ins2", job="job1"} 0.1333333333333333
@@ -241,18 +396,32 @@ eval instant at 50m histogram_quantile(0.5, sum(rate(request_duration_seconds_bu
 	{instance="ins2", job="job2"} 0.1166666666666667
 
 # The unaggregated histogram for comparison. Same result as the previous one.
+
+eval instant at 50m histogram_quantile(0.3, rate(request_duration_seconds[5m]))
+	{instance="ins1", job="job1"} 0.11
+	{instance="ins2", job="job1"} 0.09
+	{instance="ins1", job="job2"} 0.06
+	{instance="ins2", job="job2"} 0.0675
+
 eval instant at 50m histogram_quantile(0.3, rate(request_duration_seconds_bucket[5m]))
 	{instance="ins1", job="job1"} 0.11
 	{instance="ins2", job="job1"} 0.09
 	{instance="ins1", job="job2"} 0.06
 	{instance="ins2", job="job2"} 0.0675
 
+eval instant at 50m histogram_quantile(0.5, rate(request_duration_seconds[5m]))
+	{instance="ins1", job="job1"} 0.15
+	{instance="ins2", job="job1"} 0.13333333333333333
+	{instance="ins1", job="job2"} 0.1
+	{instance="ins2", job="job2"} 0.11666666666666667
+
 eval instant at 50m histogram_quantile(0.5, rate(request_duration_seconds_bucket[5m]))
 	{instance="ins1", job="job1"} 0.15
 	{instance="ins2", job="job1"} 0.13333333333333333
 	{instance="ins1", job="job2"} 0.1
 	{instance="ins2", job="job2"} 0.11666666666666667
 
+# All NHCBs summed into one.
 eval instant at 50m sum(request_duration_seconds)
 	{} {{schema:-53 count:250 custom_values:[0.1 0.2] buckets:[100 90 60]}}
 
@@ -303,11 +472,13 @@ load_with_nhcb 5m
 eval instant at 50m histogram_quantile(0.2, rate(empty_bucket[5m]))
 	{instance="ins1", job="job1"} NaN
 
-# Load a duplicate histogram with a different name to test failure scenario on multiple histograms with the same label set
+# Load a duplicate histogram with a different name to test failure scenario on multiple histograms with the same label set.
 # https://github.com/prometheus/prometheus/issues/9910
 load_with_nhcb 5m
 	request_duration_seconds2_bucket{job="job1", instance="ins1", le="0.1"}	 0+1x10
 	request_duration_seconds2_bucket{job="job1", instance="ins1", le="0.2"}	 0+3x10
 	request_duration_seconds2_bucket{job="job1", instance="ins1", le="+Inf"} 0+4x10
 
-eval_fail instant at 50m histogram_quantile(0.99, {__name__=~"request_duration_seconds\\d*_bucket$"})
+eval_fail instant at 50m histogram_quantile(0.99, {__name__=~"request_duration_seconds\\d*_bucket"})
+
+eval_fail instant at 50m histogram_quantile(0.99, {__name__=~"request_duration_seconds\\d*"})

promql/promqltest/testdata/staleness.test

@@ -32,6 +32,9 @@ eval instant at 20s count_over_time(metric[1s])
 eval instant at 20s count_over_time(metric[10s])
   {} 1
 
+eval instant at 20s count_over_time(metric[10])
+  {} 1
+
 
 clear
 

promql/promqltest/testdata/subquery.test

@@ -76,6 +76,21 @@ eval instant at 1010s sum_over_time(metric1[30s:10s] offset 3s)
 eval instant at 1010s sum_over_time((metric1)[30s:10s] offset 3s)
   {} 297
 
+eval instant at 1010s sum_over_time(metric1[30:10] offset 3)
+  {} 297
+
+eval instant at 1010s sum_over_time((metric1)[30:10s] offset 3s)
+  {} 297
+
+eval instant at 1010s sum_over_time((metric1)[30:10s] offset 3s)
+  {} 297
+
+eval instant at 1010s sum_over_time((metric1)[30:10] offset 3s)
+  {} 297
+
+eval instant at 1010s sum_over_time((metric1)[30:10] offset 3)
+  {} 297
+
 # Nested subqueries
 eval instant at 1000s rate(sum_over_time(metric1[30s:10s])[50s:10s])
   {} 0.4

rules/group.go

@@ -621,14 +621,12 @@ func (g *Group) Eval(ctx context.Context, ts time.Time) {
 			}
 		}
 
-		// If the rule has no dependencies, it can run concurrently because no other rules in this group depend on its output.
-		// Try run concurrently if there are slots available.
-		if ctrl := g.concurrencyController; isRuleEligibleForConcurrentExecution(rule) && ctrl.Allow() {
+		if ctrl := g.concurrencyController; ctrl.Allow(ctx, g, rule) {
 			wg.Add(1)
 
 			go eval(i, rule, func() {
 				wg.Done()
-				ctrl.Done()
+				ctrl.Done(ctx)
 			})
 		} else {
 			eval(i, rule, nil)
@@ -1094,7 +1092,3 @@ func buildDependencyMap(rules []Rule) dependencyMap {
 
 	return dependencies
 }
-
-func isRuleEligibleForConcurrentExecution(rule Rule) bool {
-	return rule.NoDependentRules() && rule.NoDependencyRules()
-}

rules/manager.go

@@ -457,67 +457,47 @@ func (c ruleDependencyController) AnalyseRules(rules []Rule) {
 // Its purpose is to bound the amount of concurrency in rule evaluations to avoid overwhelming the Prometheus
 // server with additional query load. Concurrency is controlled globally, not on a per-group basis.
 type RuleConcurrencyController interface {
-	// Allow determines whether any concurrent evaluation slots are available.
-	// If Allow() returns true, then Done() must be called to release the acquired slot.
-	Allow() bool
+	// Allow determines if the given rule is allowed to be evaluated concurrently.
+	// If Allow() returns true, then Done() must be called to release the acquired slot and corresponding cleanup is done.
+	// It is important that both *Group and Rule are not retained and only be used for the duration of the call.
+	Allow(ctx context.Context, group *Group, rule Rule) bool
 
 	// Done releases a concurrent evaluation slot.
-	Done()
+	Done(ctx context.Context)
 }
 
 // concurrentRuleEvalController holds a weighted semaphore which controls the concurrent evaluation of rules.
 type concurrentRuleEvalController struct {
 	sema *semaphore.Weighted
-	depMapsMu sync.Mutex
-	depMaps   map[*Group]dependencyMap
 }
 
 func newRuleConcurrencyController(maxConcurrency int64) RuleConcurrencyController {
 	return &concurrentRuleEvalController{
 		sema: semaphore.NewWeighted(maxConcurrency),
-		depMaps: map[*Group]dependencyMap{},
 	}
 }
 
-func (c *concurrentRuleEvalController) RuleEligible(g *Group, r Rule) bool {
-	c.depMapsMu.Lock()
-	defer c.depMapsMu.Unlock()
-
-	depMap, found := c.depMaps[g]
-	if !found {
-		depMap = buildDependencyMap(g.rules)
-		c.depMaps[g] = depMap
-	}
-
-	return depMap.isIndependent(r)
-}
-
-func (c *concurrentRuleEvalController) Allow() bool {
+func (c *concurrentRuleEvalController) Allow(_ context.Context, _ *Group, rule Rule) bool {
+	// To allow a rule to be executed concurrently, we need 3 conditions:
+	// 1. The rule must not have any rules that depend on it.
+	// 2. The rule itself must not depend on any other rules.
+	// 3. If 1 & 2 are true, then and only then we should try to acquire the concurrency slot.
+	if rule.NoDependentRules() && rule.NoDependencyRules() {
 		return c.sema.TryAcquire(1)
+	}
+
+	return false
 }
 
-func (c *concurrentRuleEvalController) Done() {
+func (c *concurrentRuleEvalController) Done(_ context.Context) {
 	c.sema.Release(1)
 }
 
-func (c *concurrentRuleEvalController) Invalidate() {
-	c.depMapsMu.Lock()
-	defer c.depMapsMu.Unlock()
-
-	// Clear out the memoized dependency maps because some or all groups may have been updated.
-	c.depMaps = map[*Group]dependencyMap{}
-}
-
 // sequentialRuleEvalController is a RuleConcurrencyController that runs every rule sequentially.
 type sequentialRuleEvalController struct{}
 
-func (c sequentialRuleEvalController) RuleEligible(_ *Group, _ Rule) bool {
+func (c sequentialRuleEvalController) Allow(_ context.Context, _ *Group, _ Rule) bool {
 	return false
 }
 
-func (c sequentialRuleEvalController) Allow() bool {
-	return false
-}
-
-func (c sequentialRuleEvalController) Done()       {}
-func (c sequentialRuleEvalController) Invalidate() {}
+func (c sequentialRuleEvalController) Done(_ context.Context) {}

rules/manager_test.go

@@ -32,7 +32,6 @@ import (
 	"github.com/prometheus/common/model"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/atomic"
-	"go.uber.org/goleak"
 	"gopkg.in/yaml.v2"
 
 	"github.com/prometheus/prometheus/model/labels"
@@ -50,7 +49,7 @@ import (
 )
 
 func TestMain(m *testing.M) {
-	goleak.VerifyTestMain(m)
+	prom_testutil.TolerantVerifyLeak(m)
 }
 
 func TestAlertingRule(t *testing.T) {

scripts/golangci-lint.yml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
       - name: Install Go
         uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
         with:

storage/fanout_test.go

@@ -238,11 +238,11 @@ func (errQuerier) Select(context.Context, bool, *storage.SelectHints, ...*labels
 	return storage.ErrSeriesSet(errSelect)
 }
 
-func (errQuerier) LabelValues(context.Context, string, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (errQuerier) LabelValues(context.Context, string, *storage.LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, errors.New("label values error")
 }
 
-func (errQuerier) LabelNames(context.Context, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (errQuerier) LabelNames(context.Context, *storage.LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, errors.New("label names error")
 }
 

storage/interface.go

@@ -122,11 +122,11 @@ type MockQuerier struct {
 	SelectMockFunction func(sortSeries bool, hints *SelectHints, matchers ...*labels.Matcher) SeriesSet
 }
 
-func (q *MockQuerier) LabelValues(context.Context, string, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (q *MockQuerier) LabelValues(context.Context, string, *LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, nil
 }
 
-func (q *MockQuerier) LabelNames(context.Context, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (q *MockQuerier) LabelNames(context.Context, *LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, nil
 }
 
@@ -161,12 +161,12 @@ type LabelQuerier interface {
 	// It is not safe to use the strings beyond the lifetime of the querier.
 	// If matchers are specified the returned result set is reduced
 	// to label values of metrics matching the matchers.
-	LabelValues(ctx context.Context, name string, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error)
+	LabelValues(ctx context.Context, name string, hints *LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error)
 
 	// LabelNames returns all the unique label names present in the block in sorted order.
 	// If matchers are specified the returned result set is reduced
 	// to label names of metrics matching the matchers.
-	LabelNames(ctx context.Context, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error)
+	LabelNames(ctx context.Context, hints *LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error)
 
 	// Close releases the resources of the Querier.
 	Close() error
@@ -190,6 +190,9 @@ type SelectHints struct {
 	Start int64 // Start time in milliseconds for this select.
 	End   int64 // End time in milliseconds for this select.
 
+	// Maximum number of results returned. Use a value of 0 to disable.
+	Limit int
+
 	Step int64  // Query step size in milliseconds.
 	Func string // String representation of surrounding function or aggregation.
 
@@ -217,6 +220,13 @@ type SelectHints struct {
 	DisableTrimming bool
 }
 
+// LabelHints specifies hints passed for label reads.
+// This is used only as an option for implementation to use.
+type LabelHints struct {
+	// Maximum number of results returned. Use a value of 0 to disable.
+	Limit int
+}
+
 // TODO(bwplotka): Move to promql/engine_test.go?
 // QueryableFunc is an adapter to allow the use of ordinary functions as
 // Queryables. It follows the idea of http.HandlerFunc.

storage/memoized_iterator.go

@@ -136,6 +136,11 @@ func (b *MemoizedSeriesIterator) AtFloatHistogram() (int64, *histogram.FloatHist
 	return b.it.AtFloatHistogram(nil)
 }
 
+// AtT returns the timestamp of the current element of the iterator.
+func (b *MemoizedSeriesIterator) AtT() int64 {
+	return b.it.AtT()
+}
+
 // Err returns the last encountered error.
 func (b *MemoizedSeriesIterator) Err() error {
 	return b.it.Err()

storage/memoized_iterator_test.go

@@ -29,13 +29,15 @@ func TestMemoizedSeriesIterator(t *testing.T) {
 	sampleEq := func(ets int64, ev float64, efh *histogram.FloatHistogram) {
 		if efh == nil {
 			ts, v := it.At()
-			require.Equal(t, ets, ts, "timestamp mismatch")
-			require.Equal(t, ev, v, "value mismatch")
+			require.Equal(t, ets, ts, "At() timestamp mismatch")
+			require.Equal(t, ev, v, "At() value mismatch")
 		} else {
 			ts, fh := it.AtFloatHistogram()
-			require.Equal(t, ets, ts, "timestamp mismatch")
-			require.Equal(t, efh, fh, "histogram mismatch")
+			require.Equal(t, ets, ts, "AtFloatHistogram() timestamp mismatch")
+			require.Equal(t, efh, fh, "AtFloatHistogram() histogram mismatch")
 		}
+
+		require.Equal(t, ets, it.AtT(), "AtT() timestamp mismatch")
 	}
 	prevSampleEq := func(ets int64, ev float64, efh *histogram.FloatHistogram, eok bool) {
 		ts, v, fh, ok := it.PeekPrev()

storage/merge.go

@@ -45,26 +45,25 @@ type mergeGenericQuerier struct {
 //
 // In case of overlaps between the data given by primaries' and secondaries' Selects, merge function will be used.
 func NewMergeQuerier(primaries, secondaries []Querier, mergeFn VerticalSeriesMergeFunc) Querier {
+	primaries = filterQueriers(primaries)
+	secondaries = filterQueriers(secondaries)
+
 	switch {
-	case len(primaries)+len(secondaries) == 0:
+	case len(primaries) == 0 && len(secondaries) == 0:
 		return noopQuerier{}
 	case len(primaries) == 1 && len(secondaries) == 0:
 		return primaries[0]
 	case len(primaries) == 0 && len(secondaries) == 1:
-		return secondaries[0]
+		return &querierAdapter{newSecondaryQuerierFrom(secondaries[0])}
 	}
 
 	queriers := make([]genericQuerier, 0, len(primaries)+len(secondaries))
 	for _, q := range primaries {
-		if _, ok := q.(noopQuerier); !ok && q != nil {
 		queriers = append(queriers, newGenericQuerierFrom(q))
 	}
-	}
 	for _, q := range secondaries {
-		if _, ok := q.(noopQuerier); !ok && q != nil {
 		queriers = append(queriers, newSecondaryQuerierFrom(q))
 	}
-	}
 
 	concurrentSelect := false
 	if len(secondaries) > 0 {
@@ -77,31 +76,40 @@ func NewMergeQuerier(primaries, secondaries []Querier, mergeFn VerticalSeriesMer
 	}}
 }
 
+func filterQueriers(qs []Querier) []Querier {
+	ret := make([]Querier, 0, len(qs))
+	for _, q := range qs {
+		if _, ok := q.(noopQuerier); !ok && q != nil {
+			ret = append(ret, q)
+		}
+	}
+	return ret
+}
+
 // NewMergeChunkQuerier returns a new Chunk Querier that merges results of given primary and secondary chunk queriers.
 // See NewFanout commentary to learn more about primary vs secondary differences.
 //
 // In case of overlaps between the data given by primaries' and secondaries' Selects, merge function will be used.
 // TODO(bwplotka): Currently merge will compact overlapping chunks with bigger chunk, without limit. Split it: https://github.com/prometheus/tsdb/issues/670
 func NewMergeChunkQuerier(primaries, secondaries []ChunkQuerier, mergeFn VerticalChunkSeriesMergeFunc) ChunkQuerier {
+	primaries = filterChunkQueriers(primaries)
+	secondaries = filterChunkQueriers(secondaries)
+
 	switch {
 	case len(primaries) == 0 && len(secondaries) == 0:
 		return noopChunkQuerier{}
 	case len(primaries) == 1 && len(secondaries) == 0:
 		return primaries[0]
 	case len(primaries) == 0 && len(secondaries) == 1:
-		return secondaries[0]
+		return &chunkQuerierAdapter{newSecondaryQuerierFromChunk(secondaries[0])}
 	}
 
 	queriers := make([]genericQuerier, 0, len(primaries)+len(secondaries))
 	for _, q := range primaries {
-		if _, ok := q.(noopChunkQuerier); !ok && q != nil {
 		queriers = append(queriers, newGenericQuerierFromChunk(q))
 	}
-	}
-	for _, querier := range secondaries {
-		if _, ok := querier.(noopChunkQuerier); !ok && querier != nil {
-			queriers = append(queriers, newSecondaryQuerierFromChunk(querier))
-		}
+	for _, q := range secondaries {
+		queriers = append(queriers, newSecondaryQuerierFromChunk(q))
 	}
 
 	concurrentSelect := false
@@ -115,6 +123,16 @@ func NewMergeChunkQuerier(primaries, secondaries []ChunkQuerier, mergeFn Vertica
 	}}
 }
 
+func filterChunkQueriers(qs []ChunkQuerier) []ChunkQuerier {
+	ret := make([]ChunkQuerier, 0, len(qs))
+	for _, q := range qs {
+		if _, ok := q.(noopChunkQuerier); !ok && q != nil {
+			ret = append(ret, q)
+		}
+	}
+	return ret
+}
+
 // Select returns a set of series that matches the given label matchers.
 func (q *mergeGenericQuerier) Select(ctx context.Context, sortSeries bool, hints *SelectHints, matchers ...*labels.Matcher) genericSeriesSet {
 	seriesSets := make([]genericSeriesSet, 0, len(q.queriers))
@@ -169,8 +187,8 @@ func (l labelGenericQueriers) SplitByHalf() (labelGenericQueriers, labelGenericQ
 // LabelValues returns all potential values for a label name.
 // If matchers are specified the returned result set is reduced
 // to label values of metrics matching the matchers.
-func (q *mergeGenericQuerier) LabelValues(ctx context.Context, name string, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
-	res, ws, err := q.lvals(ctx, q.queriers, name, matchers...)
+func (q *mergeGenericQuerier) LabelValues(ctx context.Context, name string, hints *LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+	res, ws, err := q.lvals(ctx, q.queriers, name, hints, matchers...)
 	if err != nil {
 		return nil, nil, fmt.Errorf("LabelValues() from merge generic querier for label %s: %w", name, err)
 	}
@@ -178,22 +196,22 @@ func (q *mergeGenericQuerier) LabelValues(ctx context.Context, name string, matc
 }
 
 // lvals performs merge sort for LabelValues from multiple queriers.
-func (q *mergeGenericQuerier) lvals(ctx context.Context, lq labelGenericQueriers, n string, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (q *mergeGenericQuerier) lvals(ctx context.Context, lq labelGenericQueriers, n string, hints *LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	if lq.Len() == 0 {
 		return nil, nil, nil
 	}
 	if lq.Len() == 1 {
-		return lq.Get(0).LabelValues(ctx, n, matchers...)
+		return lq.Get(0).LabelValues(ctx, n, hints, matchers...)
 	}
 	a, b := lq.SplitByHalf()
 
 	var ws annotations.Annotations
-	s1, w, err := q.lvals(ctx, a, n, matchers...)
+	s1, w, err := q.lvals(ctx, a, n, hints, matchers...)
 	ws.Merge(w)
 	if err != nil {
 		return nil, ws, err
 	}
-	s2, ws, err := q.lvals(ctx, b, n, matchers...)
+	s2, ws, err := q.lvals(ctx, b, n, hints, matchers...)
 	ws.Merge(w)
 	if err != nil {
 		return nil, ws, err
@@ -229,13 +247,13 @@ func mergeStrings(a, b []string) []string {
 }
 
 // LabelNames returns all the unique label names present in all queriers in sorted order.
-func (q *mergeGenericQuerier) LabelNames(ctx context.Context, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (q *mergeGenericQuerier) LabelNames(ctx context.Context, hints *LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	var (
 		labelNamesMap = make(map[string]struct{})
 		warnings      annotations.Annotations
 	)
 	for _, querier := range q.queriers {
-		names, wrn, err := querier.LabelNames(ctx, matchers...)
+		names, wrn, err := querier.LabelNames(ctx, hints, matchers...)
 		if wrn != nil {
 			// TODO(bwplotka): We could potentially wrap warnings.
 			warnings.Merge(wrn)

storage/merge_test.go

@@ -912,9 +912,23 @@ func TestConcatenatingChunkIterator(t *testing.T) {
 }
 
 type mockQuerier struct {
-	LabelQuerier
+	mtx sync.Mutex
 
-	toReturn []Series
+	toReturn []Series // Response for Select.
+
+	closed                bool
+	labelNamesCalls       int
+	labelNamesRequested   []labelNameRequest
+	sortedSeriesRequested []bool
+
+	resp     []string // Response for LabelNames and LabelValues; turned into Select response if toReturn is not supplied.
+	warnings annotations.Annotations
+	err      error
+}
+
+type labelNameRequest struct {
+	name     string
+	matchers []*labels.Matcher
 }
 
 type seriesByLabel []Series
@@ -924,13 +938,47 @@ func (a seriesByLabel) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
 func (a seriesByLabel) Less(i, j int) bool { return labels.Compare(a[i].Labels(), a[j].Labels()) < 0 }
 
 func (m *mockQuerier) Select(_ context.Context, sortSeries bool, _ *SelectHints, _ ...*labels.Matcher) SeriesSet {
-	cpy := make([]Series, len(m.toReturn))
-	copy(cpy, m.toReturn)
+	m.mtx.Lock()
+	defer m.mtx.Unlock()
+	m.sortedSeriesRequested = append(m.sortedSeriesRequested, sortSeries)
+
+	var ret []Series
+	if len(m.toReturn) > 0 {
+		ret = make([]Series, len(m.toReturn))
+		copy(ret, m.toReturn)
+	} else if len(m.resp) > 0 {
+		ret = make([]Series, 0, len(m.resp))
+		for _, l := range m.resp {
+			ret = append(ret, NewListSeries(labels.FromStrings("test", l), nil))
+		}
+	}
 	if sortSeries {
-		sort.Sort(seriesByLabel(cpy))
+		sort.Sort(seriesByLabel(ret))
 	}
 
-	return NewMockSeriesSet(cpy...)
+	return &mockSeriesSet{idx: -1, series: ret, warnings: m.warnings, err: m.err}
+}
+
+func (m *mockQuerier) LabelValues(_ context.Context, name string, hints *LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+	m.mtx.Lock()
+	m.labelNamesRequested = append(m.labelNamesRequested, labelNameRequest{
+		name:     name,
+		matchers: matchers,
+	})
+	m.mtx.Unlock()
+	return m.resp, m.warnings, m.err
+}
+
+func (m *mockQuerier) LabelNames(context.Context, *LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+	m.mtx.Lock()
+	m.labelNamesCalls++
+	m.mtx.Unlock()
+	return m.resp, m.warnings, m.err
+}
+
+func (m *mockQuerier) Close() error {
+	m.closed = true
+	return nil
 }
 
 type mockChunkQuerier struct {
@@ -960,6 +1008,9 @@ func (m *mockChunkQuerier) Select(_ context.Context, sortSeries bool, _ *SelectH
 type mockSeriesSet struct {
 	idx    int
 	series []Series
+
+	warnings annotations.Annotations
+	err      error
 }
 
 func NewMockSeriesSet(series ...Series) SeriesSet {
@@ -970,15 +1021,18 @@ func NewMockSeriesSet(series ...Series) SeriesSet {
 }
 
 func (m *mockSeriesSet) Next() bool {
+	if m.err != nil {
+		return false
+	}
 	m.idx++
 	return m.idx < len(m.series)
 }
 
 func (m *mockSeriesSet) At() Series { return m.series[m.idx] }
 
-func (m *mockSeriesSet) Err() error { return nil }
+func (m *mockSeriesSet) Err() error { return m.err }
 
-func (m *mockSeriesSet) Warnings() annotations.Annotations { return nil }
+func (m *mockSeriesSet) Warnings() annotations.Annotations { return m.warnings }
 
 type mockChunkSeriesSet struct {
 	idx    int
@@ -1336,97 +1390,35 @@ func BenchmarkMergeSeriesSet(b *testing.B) {
 	}
 }
 
-type mockGenericQuerier struct {
-	mtx sync.Mutex
-
-	closed                bool
-	labelNamesCalls       int
-	labelNamesRequested   []labelNameRequest
-	sortedSeriesRequested []bool
-
-	resp     []string
-	warnings annotations.Annotations
-	err      error
-}
-
-type labelNameRequest struct {
-	name     string
-	matchers []*labels.Matcher
-}
-
-func (m *mockGenericQuerier) Select(_ context.Context, b bool, _ *SelectHints, _ ...*labels.Matcher) genericSeriesSet {
-	m.mtx.Lock()
-	m.sortedSeriesRequested = append(m.sortedSeriesRequested, b)
-	m.mtx.Unlock()
-	return &mockGenericSeriesSet{resp: m.resp, warnings: m.warnings, err: m.err}
-}
-
-func (m *mockGenericQuerier) LabelValues(_ context.Context, name string, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
-	m.mtx.Lock()
-	m.labelNamesRequested = append(m.labelNamesRequested, labelNameRequest{
-		name:     name,
-		matchers: matchers,
-	})
-	m.mtx.Unlock()
-	return m.resp, m.warnings, m.err
-}
-
-func (m *mockGenericQuerier) LabelNames(context.Context, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
-	m.mtx.Lock()
-	m.labelNamesCalls++
-	m.mtx.Unlock()
-	return m.resp, m.warnings, m.err
-}
-
-func (m *mockGenericQuerier) Close() error {
-	m.closed = true
-	return nil
-}
-
-type mockGenericSeriesSet struct {
-	resp     []string
-	warnings annotations.Annotations
-	err      error
-
-	curr int
-}
-
-func (m *mockGenericSeriesSet) Next() bool {
-	if m.err != nil {
-		return false
+func visitMockQueriers(t *testing.T, qr Querier, f func(t *testing.T, q *mockQuerier)) int {
+	count := 0
+	switch x := qr.(type) {
+	case *mockQuerier:
+		count++
+		f(t, x)
+	case *querierAdapter:
+		count += visitMockQueriersInGenericQuerier(t, x.genericQuerier, f)
 	}
-	if m.curr >= len(m.resp) {
-		return false
+	return count
+}
+
+func visitMockQueriersInGenericQuerier(t *testing.T, g genericQuerier, f func(t *testing.T, q *mockQuerier)) int {
+	count := 0
+	switch x := g.(type) {
+	case *mergeGenericQuerier:
+		for _, q := range x.queriers {
+			count += visitMockQueriersInGenericQuerier(t, q, f)
 		}
-	m.curr++
-	return true
-}
-
-func (m *mockGenericSeriesSet) Err() error                        { return m.err }
-func (m *mockGenericSeriesSet) Warnings() annotations.Annotations { return m.warnings }
-
-func (m *mockGenericSeriesSet) At() Labels {
-	return mockLabels(m.resp[m.curr-1])
-}
-
-type mockLabels string
-
-func (l mockLabels) Labels() labels.Labels {
-	return labels.FromStrings("test", string(l))
-}
-
-func unwrapMockGenericQuerier(t *testing.T, qr genericQuerier) *mockGenericQuerier {
-	m, ok := qr.(*mockGenericQuerier)
-	if !ok {
-		s, ok := qr.(*secondaryQuerier)
-		require.True(t, ok, "expected secondaryQuerier got something else")
-		m, ok = s.genericQuerier.(*mockGenericQuerier)
-		require.True(t, ok, "expected mockGenericQuerier got something else")
+	case *genericQuerierAdapter:
+		// Visitor for chunkQuerier not implemented.
+		count += visitMockQueriers(t, x.q, f)
+	case *secondaryQuerier:
+		count += visitMockQueriersInGenericQuerier(t, x.genericQuerier, f)
 	}
-	return m
+	return count
 }
 
-func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
+func TestMergeQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 	var (
 		errStorage  = errors.New("storage error")
 		warnStorage = errors.New("storage warning")
@@ -1434,7 +1426,8 @@ func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 	)
 	for _, tcase := range []struct {
 		name        string
-		queriers []genericQuerier
+		primaries   []Querier
+		secondaries []Querier
 
 		expectedSelectsSeries []labels.Labels
 		expectedLabels        []string
@@ -1443,10 +1436,8 @@ func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 		expectedErrs     [4]error
 	}{
 		{
-			// NewMergeQuerier will not create a mergeGenericQuerier
-			// with just one querier inside, but we can test it anyway.
 			name:      "one successful primary querier",
-			queriers: []genericQuerier{&mockGenericQuerier{resp: []string{"a", "b"}, warnings: nil, err: nil}},
+			primaries: []Querier{&mockQuerier{resp: []string{"a", "b"}, warnings: nil, err: nil}},
 			expectedSelectsSeries: []labels.Labels{
 				labels.FromStrings("test", "a"),
 				labels.FromStrings("test", "b"),
@@ -1455,9 +1446,9 @@ func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 		},
 		{
 			name: "multiple successful primary queriers",
-			queriers: []genericQuerier{
-				&mockGenericQuerier{resp: []string{"a", "b"}, warnings: nil, err: nil},
-				&mockGenericQuerier{resp: []string{"b", "c"}, warnings: nil, err: nil},
+			primaries: []Querier{
+				&mockQuerier{resp: []string{"a", "b"}, warnings: nil, err: nil},
+				&mockQuerier{resp: []string{"b", "c"}, warnings: nil, err: nil},
 			},
 			expectedSelectsSeries: []labels.Labels{
 				labels.FromStrings("test", "a"),
@@ -1468,15 +1459,17 @@ func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 		},
 		{
 			name:         "one failed primary querier",
-			queriers:     []genericQuerier{&mockGenericQuerier{warnings: nil, err: errStorage}},
+			primaries:    []Querier{&mockQuerier{warnings: nil, err: errStorage}},
 			expectedErrs: [4]error{errStorage, errStorage, errStorage, errStorage},
 		},
 		{
 			name: "one successful primary querier with successful secondaries",
-			queriers: []genericQuerier{
-				&mockGenericQuerier{resp: []string{"a", "b"}, warnings: nil, err: nil},
-				&secondaryQuerier{genericQuerier: &mockGenericQuerier{resp: []string{"b"}, warnings: nil, err: nil}},
-				&secondaryQuerier{genericQuerier: &mockGenericQuerier{resp: []string{"c"}, warnings: nil, err: nil}},
+			primaries: []Querier{
+				&mockQuerier{resp: []string{"a", "b"}, warnings: nil, err: nil},
+			},
+			secondaries: []Querier{
+				&mockQuerier{resp: []string{"b"}, warnings: nil, err: nil},
+				&mockQuerier{resp: []string{"c"}, warnings: nil, err: nil},
 			},
 			expectedSelectsSeries: []labels.Labels{
 				labels.FromStrings("test", "a"),
@@ -1487,10 +1480,12 @@ func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 		},
 		{
 			name: "one successful primary querier with empty response and successful secondaries",
-			queriers: []genericQuerier{
-				&mockGenericQuerier{resp: []string{}, warnings: nil, err: nil},
-				&secondaryQuerier{genericQuerier: &mockGenericQuerier{resp: []string{"b"}, warnings: nil, err: nil}},
-				&secondaryQuerier{genericQuerier: &mockGenericQuerier{resp: []string{"c"}, warnings: nil, err: nil}},
+			primaries: []Querier{
+				&mockQuerier{resp: []string{}, warnings: nil, err: nil},
+			},
+			secondaries: []Querier{
+				&mockQuerier{resp: []string{"b"}, warnings: nil, err: nil},
+				&mockQuerier{resp: []string{"c"}, warnings: nil, err: nil},
 			},
 			expectedSelectsSeries: []labels.Labels{
 				labels.FromStrings("test", "b"),
@@ -1500,19 +1495,42 @@ func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 		},
 		{
 			name: "one failed primary querier with successful secondaries",
-			queriers: []genericQuerier{
-				&mockGenericQuerier{warnings: nil, err: errStorage},
-				&secondaryQuerier{genericQuerier: &mockGenericQuerier{resp: []string{"b"}, warnings: nil, err: nil}},
-				&secondaryQuerier{genericQuerier: &mockGenericQuerier{resp: []string{"c"}, warnings: nil, err: nil}},
+			primaries: []Querier{
+				&mockQuerier{warnings: nil, err: errStorage},
+			},
+			secondaries: []Querier{
+				&mockQuerier{resp: []string{"b"}, warnings: nil, err: nil},
+				&mockQuerier{resp: []string{"c"}, warnings: nil, err: nil},
 			},
 			expectedErrs: [4]error{errStorage, errStorage, errStorage, errStorage},
 		},
+		{
+			name:      "nil primary querier with failed secondary",
+			primaries: nil,
+			secondaries: []Querier{
+				&mockQuerier{resp: []string{"b"}, warnings: nil, err: errStorage},
+			},
+			expectedLabels:   []string{},
+			expectedWarnings: annotations.New().Add(errStorage),
+		},
+		{
+			name:      "nil primary querier with two failed secondaries",
+			primaries: nil,
+			secondaries: []Querier{
+				&mockQuerier{resp: []string{"b"}, warnings: nil, err: errStorage},
+				&mockQuerier{resp: []string{"c"}, warnings: nil, err: errStorage},
+			},
+			expectedLabels:   []string{},
+			expectedWarnings: annotations.New().Add(errStorage),
+		},
 		{
 			name: "one successful primary querier with failed secondaries",
-			queriers: []genericQuerier{
-				&mockGenericQuerier{resp: []string{"a"}, warnings: nil, err: nil},
-				&secondaryQuerier{genericQuerier: &mockGenericQuerier{resp: []string{"b"}, warnings: nil, err: errStorage}},
-				&secondaryQuerier{genericQuerier: &mockGenericQuerier{resp: []string{"c"}, warnings: nil, err: errStorage}},
+			primaries: []Querier{
+				&mockQuerier{resp: []string{"a"}, warnings: nil, err: nil},
+			},
+			secondaries: []Querier{
+				&mockQuerier{resp: []string{"b"}, warnings: nil, err: errStorage},
+				&mockQuerier{resp: []string{"c"}, warnings: nil, err: errStorage},
 			},
 			expectedSelectsSeries: []labels.Labels{
 				labels.FromStrings("test", "a"),
@@ -1522,9 +1540,11 @@ func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 		},
 		{
 			name: "successful queriers with warnings",
-			queriers: []genericQuerier{
-				&mockGenericQuerier{resp: []string{"a"}, warnings: annotations.New().Add(warnStorage), err: nil},
-				&secondaryQuerier{genericQuerier: &mockGenericQuerier{resp: []string{"b"}, warnings: annotations.New().Add(warnStorage), err: nil}},
+			primaries: []Querier{
+				&mockQuerier{resp: []string{"a"}, warnings: annotations.New().Add(warnStorage), err: nil},
+			},
+			secondaries: []Querier{
+				&mockQuerier{resp: []string{"b"}, warnings: annotations.New().Add(warnStorage), err: nil},
 			},
 			expectedSelectsSeries: []labels.Labels{
 				labels.FromStrings("test", "a"),
@@ -1535,10 +1555,7 @@ func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 		},
 	} {
 		t.Run(tcase.name, func(t *testing.T) {
-			q := &mergeGenericQuerier{
-				queriers: tcase.queriers,
-				mergeFn:  func(l ...Labels) Labels { return l[0] },
-			}
+			q := NewMergeQuerier(tcase.primaries, tcase.secondaries, func(s ...Series) Series { return s[0] })
 
 			t.Run("Select", func(t *testing.T) {
 				res := q.Select(context.Background(), false, nil)
@@ -1551,62 +1568,67 @@ func TestMergeGenericQuerierWithSecondaries_ErrorHandling(t *testing.T) {
 				require.ErrorIs(t, res.Err(), tcase.expectedErrs[0], "expected error doesn't match")
 				require.Equal(t, tcase.expectedSelectsSeries, lbls)
 
-				for _, qr := range q.queriers {
-					m := unwrapMockGenericQuerier(t, qr)
-					// mergeGenericQuerier forces all Selects to be sorted.
-					require.Equal(t, []bool{true}, m.sortedSeriesRequested)
-				}
+				n := visitMockQueriers(t, q, func(t *testing.T, m *mockQuerier) {
+					// Single queries should be unsorted; merged queries sorted.
+					exp := len(tcase.primaries)+len(tcase.secondaries) > 1
+					require.Equal(t, []bool{exp}, m.sortedSeriesRequested)
+				})
+				// Check we visited all queriers.
+				require.Equal(t, len(tcase.primaries)+len(tcase.secondaries), n)
 			})
 			t.Run("LabelNames", func(t *testing.T) {
-				res, w, err := q.LabelNames(ctx)
+				res, w, err := q.LabelNames(ctx, nil)
 				require.Subset(t, tcase.expectedWarnings, w)
 				require.ErrorIs(t, err, tcase.expectedErrs[1], "expected error doesn't match")
-				require.Equal(t, tcase.expectedLabels, res)
+				requireEqualSlice(t, tcase.expectedLabels, res)
 
 				if err != nil {
 					return
 				}
-				for _, qr := range q.queriers {
-					m := unwrapMockGenericQuerier(t, qr)
-
+				visitMockQueriers(t, q, func(t *testing.T, m *mockQuerier) {
 					require.Equal(t, 1, m.labelNamesCalls)
-				}
+				})
 			})
 			t.Run("LabelValues", func(t *testing.T) {
-				res, w, err := q.LabelValues(ctx, "test")
+				res, w, err := q.LabelValues(ctx, "test", nil)
 				require.Subset(t, tcase.expectedWarnings, w)
 				require.ErrorIs(t, err, tcase.expectedErrs[2], "expected error doesn't match")
-				require.Equal(t, tcase.expectedLabels, res)
+				requireEqualSlice(t, tcase.expectedLabels, res)
 
 				if err != nil {
 					return
 				}
-				for _, qr := range q.queriers {
-					m := unwrapMockGenericQuerier(t, qr)
-
+				visitMockQueriers(t, q, func(t *testing.T, m *mockQuerier) {
 					require.Equal(t, []labelNameRequest{{name: "test"}}, m.labelNamesRequested)
-				}
+				})
 			})
 			t.Run("LabelValuesWithMatchers", func(t *testing.T) {
 				matcher := labels.MustNewMatcher(labels.MatchEqual, "otherLabel", "someValue")
-				res, w, err := q.LabelValues(ctx, "test2", matcher)
+				res, w, err := q.LabelValues(ctx, "test2", nil, matcher)
 				require.Subset(t, tcase.expectedWarnings, w)
 				require.ErrorIs(t, err, tcase.expectedErrs[3], "expected error doesn't match")
-				require.Equal(t, tcase.expectedLabels, res)
+				requireEqualSlice(t, tcase.expectedLabels, res)
 
 				if err != nil {
 					return
 				}
-				for _, qr := range q.queriers {
-					m := unwrapMockGenericQuerier(t, qr)
-
+				visitMockQueriers(t, q, func(t *testing.T, m *mockQuerier) {
 					require.Equal(t, []labelNameRequest{
 						{name: "test"},
 						{name: "test2", matchers: []*labels.Matcher{matcher}},
 					}, m.labelNamesRequested)
+				})
+			})
+		})
 	}
-			})
-		})
+}
+
+// Check slice but ignore difference between nil and empty.
+func requireEqualSlice[T any](t require.TestingT, a, b []T, msgAndArgs ...interface{}) {
+	if len(a) == 0 {
+		require.Empty(t, b, msgAndArgs...)
+	} else {
+		require.Equal(t, a, b, msgAndArgs...)
 	}
 }
 

storage/noop.go

@@ -31,11 +31,11 @@ func (noopQuerier) Select(context.Context, bool, *SelectHints, ...*labels.Matche
 	return NoopSeriesSet()
 }
 
-func (noopQuerier) LabelValues(context.Context, string, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (noopQuerier) LabelValues(context.Context, string, *LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, nil
 }
 
-func (noopQuerier) LabelNames(context.Context, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (noopQuerier) LabelNames(context.Context, *LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, nil
 }
 
@@ -54,11 +54,11 @@ func (noopChunkQuerier) Select(context.Context, bool, *SelectHints, ...*labels.M
 	return NoopChunkedSeriesSet()
 }
 
-func (noopChunkQuerier) LabelValues(context.Context, string, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (noopChunkQuerier) LabelValues(context.Context, string, *LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, nil
 }
 
-func (noopChunkQuerier) LabelNames(context.Context, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (noopChunkQuerier) LabelNames(context.Context, *LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	return nil, nil, nil
 }
 

storage/remote/client.go

@@ -14,7 +14,6 @@
 package remote
 
 import (
-	"bufio"
 	"bytes"
 	"context"
 	"fmt"
@@ -38,6 +37,7 @@ import (
 	"github.com/prometheus/prometheus/config"
 	"github.com/prometheus/prometheus/prompb"
 	"github.com/prometheus/prometheus/storage/remote/azuread"
+	"github.com/prometheus/prometheus/storage/remote/googleiam"
 )
 
 const maxErrMsgLen = 1024
@@ -132,6 +132,7 @@ type ClientConfig struct {
 	HTTPClientConfig config_util.HTTPClientConfig
 	SigV4Config      *sigv4.SigV4Config
 	AzureADConfig    *azuread.AzureADConfig
+	GoogleIAMConfig  *googleiam.Config
 	Headers          map[string]string
 	RetryOnRateLimit bool
 	WriteProtoMsg    config.RemoteWriteProtoMsg
@@ -193,6 +194,13 @@ func NewWriteClient(name string, conf *ClientConfig) (WriteClient, error) {
 		}
 	}
 
+	if conf.GoogleIAMConfig != nil {
+		t, err = googleiam.NewRoundTripper(conf.GoogleIAMConfig, t)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	writeProtoMsg := config.RemoteWriteProtoMsgV1
 	if conf.WriteProtoMsg != "" {
 		writeProtoMsg = conf.WriteProtoMsg
@@ -235,12 +243,12 @@ type RecoverableError struct {
 
 // Store sends a batch of samples to the HTTP endpoint, the request is the proto marshalled
 // and encoded bytes from codec.go.
-func (c *Client) Store(ctx context.Context, req []byte, attempt int) error {
+func (c *Client) Store(ctx context.Context, req []byte, attempt int) (WriteResponseStats, error) {
 	httpReq, err := http.NewRequest(http.MethodPost, c.urlString, bytes.NewReader(req))
 	if err != nil {
 		// Errors from NewRequest are from unparsable URLs, so are not
 		// recoverable.
-		return err
+		return WriteResponseStats{}, err
 	}
 
 	httpReq.Header.Add("Content-Encoding", string(c.writeCompression))
@@ -267,28 +275,34 @@ func (c *Client) Store(ctx context.Context, req []byte, attempt int) error {
 	if err != nil {
 		// Errors from Client.Do are from (for example) network errors, so are
 		// recoverable.
-		return RecoverableError{err, defaultBackoff}
+		return WriteResponseStats{}, RecoverableError{err, defaultBackoff}
 	}
 	defer func() {
 		io.Copy(io.Discard, httpResp.Body)
 		httpResp.Body.Close()
 	}()
 
+	// TODO(bwplotka): Pass logger and emit debug on error?
+	// Parsing error means there were some response header values we can't parse,
+	// we can continue handling.
+	rs, _ := ParseWriteResponseStats(httpResp)
+
 	//nolint:usestdlibvars
-	if httpResp.StatusCode/100 != 2 {
-		scanner := bufio.NewScanner(io.LimitReader(httpResp.Body, maxErrMsgLen))
-		line := ""
-		if scanner.Scan() {
-			line = scanner.Text()
-		}
-		err = fmt.Errorf("server returned HTTP status %s: %s", httpResp.Status, line)
+	if httpResp.StatusCode/100 == 2 {
+		return rs, nil
 	}
+
+	// Handling errors e.g. read potential error in the body.
+	// TODO(bwplotka): Pass logger and emit debug on error?
+	body, _ := io.ReadAll(io.LimitReader(httpResp.Body, maxErrMsgLen))
+	err = fmt.Errorf("server returned HTTP status %s: %s", httpResp.Status, body)
+
 	//nolint:usestdlibvars
 	if httpResp.StatusCode/100 == 5 ||
 		(c.retryOnRateLimit && httpResp.StatusCode == http.StatusTooManyRequests) {
-		return RecoverableError{err, retryAfterDuration(httpResp.Header.Get("Retry-After"))}
+		return rs, RecoverableError{err, retryAfterDuration(httpResp.Header.Get("Retry-After"))}
 	}
-	return err
+	return rs, err
 }
 
 // retryAfterDuration returns the duration for the Retry-After header. In case of any errors, it

storage/remote/client_test.go

@@ -73,7 +73,7 @@ func TestStoreHTTPErrorHandling(t *testing.T) {
 		c, err := NewWriteClient(hash, conf)
 		require.NoError(t, err)
 
-		err = c.Store(context.Background(), []byte{}, 0)
+		_, err = c.Store(context.Background(), []byte{}, 0)
 		if test.err != nil {
 			require.EqualError(t, err, test.err.Error())
 		} else {
@@ -133,7 +133,7 @@ func TestClientRetryAfter(t *testing.T) {
 			c := getClient(getClientConfig(serverURL, tc.retryOnRateLimit))
 
 			var recErr RecoverableError
-			err = c.Store(context.Background(), []byte{}, 0)
+			_, err = c.Store(context.Background(), []byte{}, 0)
 			require.Equal(t, tc.expectedRecoverable, errors.As(err, &recErr), "Mismatch in expected recoverable error status.")
 			if tc.expectedRecoverable {
 				require.Equal(t, tc.expectedRetryAfter, recErr.retryAfter)
@@ -169,7 +169,7 @@ func TestRetryAfterDuration(t *testing.T) {
 	}
 }
 
-func TestClientHeaders(t *testing.T) {
+func TestClientCustomHeaders(t *testing.T) {
 	headersToSend := map[string]string{"Foo": "Bar", "Baz": "qux"}
 
 	var called bool
@@ -203,7 +203,7 @@ func TestClientHeaders(t *testing.T) {
 	c, err := NewWriteClient("c", conf)
 	require.NoError(t, err)
 
-	err = c.Store(context.Background(), []byte{}, 0)
+	_, err = c.Store(context.Background(), []byte{}, 0)
 	require.NoError(t, err)
 
 	require.True(t, called, "The remote server wasn't called")

storage/remote/codec_test.go

@@ -36,7 +36,8 @@ import (
 	"github.com/prometheus/prometheus/util/annotations"
 )
 
-var testHistogram = histogram.Histogram{
+var (
+	testHistogram = histogram.Histogram{
 		Schema:          2,
 		ZeroThreshold:   1e-128,
 		ZeroCount:       0,
@@ -46,9 +47,9 @@ var testHistogram = histogram.Histogram{
 		PositiveBuckets: []int64{1},
 		NegativeSpans:   []histogram.Span{{Offset: 0, Length: 1}},
 		NegativeBuckets: []int64{-1},
-}
+	}
 
-var writeRequestFixture = &prompb.WriteRequest{
+	writeRequestFixture = &prompb.WriteRequest{
 		Timeseries: []prompb.TimeSeries{
 			{
 				Labels: []prompb.Label{
@@ -58,9 +59,9 @@ var writeRequestFixture = &prompb.WriteRequest{
 					{Name: "d", Value: "e"},
 					{Name: "foo", Value: "bar"},
 				},
-			Samples:    []prompb.Sample{{Value: 1, Timestamp: 0}},
-			Exemplars:  []prompb.Exemplar{{Labels: []prompb.Label{{Name: "f", Value: "g"}}, Value: 1, Timestamp: 0}},
-			Histograms: []prompb.Histogram{prompb.FromIntHistogram(0, &testHistogram), prompb.FromFloatHistogram(1, testHistogram.ToFloat(nil))},
+				Samples:    []prompb.Sample{{Value: 1, Timestamp: 1}},
+				Exemplars:  []prompb.Exemplar{{Labels: []prompb.Label{{Name: "f", Value: "g"}}, Value: 1, Timestamp: 1}},
+				Histograms: []prompb.Histogram{prompb.FromIntHistogram(1, &testHistogram), prompb.FromFloatHistogram(2, testHistogram.ToFloat(nil))},
 			},
 			{
 				Labels: []prompb.Label{
@@ -70,14 +71,13 @@ var writeRequestFixture = &prompb.WriteRequest{
 					{Name: "d", Value: "e"},
 					{Name: "foo", Value: "bar"},
 				},
-			Samples:    []prompb.Sample{{Value: 2, Timestamp: 1}},
-			Exemplars:  []prompb.Exemplar{{Labels: []prompb.Label{{Name: "h", Value: "i"}}, Value: 2, Timestamp: 1}},
-			Histograms: []prompb.Histogram{prompb.FromIntHistogram(2, &testHistogram), prompb.FromFloatHistogram(3, testHistogram.ToFloat(nil))},
+				Samples:    []prompb.Sample{{Value: 2, Timestamp: 2}},
+				Exemplars:  []prompb.Exemplar{{Labels: []prompb.Label{{Name: "h", Value: "i"}}, Value: 2, Timestamp: 2}},
+				Histograms: []prompb.Histogram{prompb.FromIntHistogram(3, &testHistogram), prompb.FromFloatHistogram(4, testHistogram.ToFloat(nil))},
 			},
 		},
-}
+	}
 
-var (
 	writeV2RequestSeries1Metadata = metadata.Metadata{
 		Type: model.MetricTypeGauge,
 		Help: "Test gauge for test purposes",
@@ -88,42 +88,77 @@ var (
 		Help: "Test counter for test purposes",
 	}
 
-	// writeV2RequestFixture represents the same request as writeRequestFixture, but using the v2 representation.
-	writeV2RequestFixture = func() *writev2.Request {
+	// writeV2RequestFixture represents the same request as writeRequestFixture,
+	// but using the v2 representation, plus includes writeV2RequestSeries1Metadata and writeV2RequestSeries2Metadata.
+	// NOTE: Use TestWriteV2RequestFixture and copy the diff to regenerate if needed.
+	writeV2RequestFixture = &writev2.Request{
+		Symbols: []string{"", "__name__", "test_metric1", "b", "c", "baz", "qux", "d", "e", "foo", "bar", "f", "g", "h", "i", "Test gauge for test purposes", "Maybe op/sec who knows (:", "Test counter for test purposes"},
+		Timeseries: []writev2.TimeSeries{
+			{
+				LabelsRefs: []uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, // Symbolized writeRequestFixture.Timeseries[0].Labels
+				Metadata: writev2.Metadata{
+					Type: writev2.Metadata_METRIC_TYPE_GAUGE, // writeV2RequestSeries1Metadata.Type.
+
+					HelpRef: 15, // Symbolized writeV2RequestSeries1Metadata.Help.
+					UnitRef: 16, // Symbolized writeV2RequestSeries1Metadata.Unit.
+				},
+				Samples:    []writev2.Sample{{Value: 1, Timestamp: 1}},
+				Exemplars:  []writev2.Exemplar{{LabelsRefs: []uint32{11, 12}, Value: 1, Timestamp: 1}},
+				Histograms: []writev2.Histogram{writev2.FromIntHistogram(1, &testHistogram), writev2.FromFloatHistogram(2, testHistogram.ToFloat(nil))},
+			},
+			{
+				LabelsRefs: []uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, // Same series as first.
+				Metadata: writev2.Metadata{
+					Type: writev2.Metadata_METRIC_TYPE_COUNTER, // writeV2RequestSeries2Metadata.Type.
+
+					HelpRef: 17, // Symbolized writeV2RequestSeries2Metadata.Help.
+					// No unit.
+				},
+				Samples:    []writev2.Sample{{Value: 2, Timestamp: 2}},
+				Exemplars:  []writev2.Exemplar{{LabelsRefs: []uint32{13, 14}, Value: 2, Timestamp: 2}},
+				Histograms: []writev2.Histogram{writev2.FromIntHistogram(3, &testHistogram), writev2.FromFloatHistogram(4, testHistogram.ToFloat(nil))},
+			},
+		},
+	}
+)
+
+func TestWriteV2RequestFixture(t *testing.T) {
+	// Generate dynamically writeV2RequestFixture, reusing v1 fixture elements.
 	st := writev2.NewSymbolTable()
 	b := labels.NewScratchBuilder(0)
 	labelRefs := st.SymbolizeLabels(writeRequestFixture.Timeseries[0].ToLabels(&b, nil), nil)
 	exemplar1LabelRefs := st.SymbolizeLabels(writeRequestFixture.Timeseries[0].Exemplars[0].ToExemplar(&b, nil).Labels, nil)
-		exemplar2LabelRefs := st.SymbolizeLabels(writeRequestFixture.Timeseries[0].Exemplars[0].ToExemplar(&b, nil).Labels, nil)
-		return &writev2.Request{
+	exemplar2LabelRefs := st.SymbolizeLabels(writeRequestFixture.Timeseries[1].Exemplars[0].ToExemplar(&b, nil).Labels, nil)
+	expected := &writev2.Request{
 		Timeseries: []writev2.TimeSeries{
 			{
 				LabelsRefs: labelRefs,
 				Metadata: writev2.Metadata{
-						Type:    writev2.Metadata_METRIC_TYPE_GAUGE, // Same as writeV2RequestSeries1Metadata.Type, but in writev2.
+					Type:    writev2.Metadata_METRIC_TYPE_GAUGE,
 					HelpRef: st.Symbolize(writeV2RequestSeries1Metadata.Help),
 					UnitRef: st.Symbolize(writeV2RequestSeries1Metadata.Unit),
 				},
-					Samples:    []writev2.Sample{{Value: 1, Timestamp: 0}},
-					Exemplars:  []writev2.Exemplar{{LabelsRefs: exemplar1LabelRefs, Value: 1, Timestamp: 0}},
-					Histograms: []writev2.Histogram{writev2.FromIntHistogram(0, &testHistogram), writev2.FromFloatHistogram(1, testHistogram.ToFloat(nil))},
+				Samples:    []writev2.Sample{{Value: 1, Timestamp: 1}},
+				Exemplars:  []writev2.Exemplar{{LabelsRefs: exemplar1LabelRefs, Value: 1, Timestamp: 1}},
+				Histograms: []writev2.Histogram{writev2.FromIntHistogram(1, &testHistogram), writev2.FromFloatHistogram(2, testHistogram.ToFloat(nil))},
 			},
 			{
 				LabelsRefs: labelRefs,
 				Metadata: writev2.Metadata{
-						Type:    writev2.Metadata_METRIC_TYPE_COUNTER, // Same as writeV2RequestSeries2Metadata.Type, but in writev2.
+					Type:    writev2.Metadata_METRIC_TYPE_COUNTER,
 					HelpRef: st.Symbolize(writeV2RequestSeries2Metadata.Help),
 					// No unit.
 				},
-					Samples:    []writev2.Sample{{Value: 2, Timestamp: 1}},
-					Exemplars:  []writev2.Exemplar{{LabelsRefs: exemplar2LabelRefs, Value: 2, Timestamp: 1}},
-					Histograms: []writev2.Histogram{writev2.FromIntHistogram(2, &testHistogram), writev2.FromFloatHistogram(3, testHistogram.ToFloat(nil))},
+				Samples:    []writev2.Sample{{Value: 2, Timestamp: 2}},
+				Exemplars:  []writev2.Exemplar{{LabelsRefs: exemplar2LabelRefs, Value: 2, Timestamp: 2}},
+				Histograms: []writev2.Histogram{writev2.FromIntHistogram(3, &testHistogram), writev2.FromFloatHistogram(4, testHistogram.ToFloat(nil))},
 			},
 		},
 		Symbols: st.Symbols(),
 	}
-	}()
-)
+	// Check if it matches static writeV2RequestFixture.
+	require.Equal(t, expected, writeV2RequestFixture)
+}
 
 func TestValidateLabelsAndMetricName(t *testing.T) {
 	tests := []struct {

storage/remote/googleiam/googleiam.go

@@ -0,0 +1,54 @@
+// Copyright 2024 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 googleiam provides an http.RoundTripper that attaches an Google Cloud accessToken
+// to remote write requests.
+package googleiam
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"golang.org/x/oauth2/google"
+	"google.golang.org/api/option"
+	apihttp "google.golang.org/api/transport/http"
+)
+
+type Config struct {
+	CredentialsFile string `yaml:"credentials_file,omitempty"`
+}
+
+// NewRoundTripper creates a round tripper that adds Google Cloud Monitoring authorization to calls
+// using either a credentials file or the default credentials.
+func NewRoundTripper(cfg *Config, next http.RoundTripper) (http.RoundTripper, error) {
+	if next == nil {
+		next = http.DefaultTransport
+	}
+	const scopes = "https://www.googleapis.com/auth/monitoring.write"
+	ctx := context.Background()
+	opts := []option.ClientOption{
+		option.WithScopes(scopes),
+	}
+	if cfg.CredentialsFile != "" {
+		opts = append(opts, option.WithCredentialsFile(cfg.CredentialsFile))
+	} else {
+		creds, err := google.FindDefaultCredentials(ctx, scopes)
+		if err != nil {
+			return nil, fmt.Errorf("error finding default Google credentials: %w", err)
+		}
+		opts = append(opts, option.WithCredentials(creds))
+	}
+
+	return apihttp.NewTransport(ctx, next, opts...)
+}

storage/remote/max_timestamp.go

@@ -39,9 +39,3 @@ func (m *maxTimestamp) Get() float64 {
 	defer m.mtx.Unlock()
 	return m.value
 }
-
-func (m *maxTimestamp) Collect(c chan<- prometheus.Metric) {
-	if m.Get() > 0 {
-		m.Gauge.Collect(c)
-	}
-}

storage/remote/otlptranslator/prometheusremotewrite/helper.go

@@ -65,14 +65,14 @@ type bucketBoundsData struct {
 	bound float64
 }
 
-// byBucketBoundsData enables the usage of sort.Sort() with a slice of bucket bounds
+// byBucketBoundsData enables the usage of sort.Sort() with a slice of bucket bounds.
 type byBucketBoundsData []bucketBoundsData
 
 func (m byBucketBoundsData) Len() int           { return len(m) }
 func (m byBucketBoundsData) Less(i, j int) bool { return m[i].bound < m[j].bound }
 func (m byBucketBoundsData) Swap(i, j int)      { m[i], m[j] = m[j], m[i] }
 
-// ByLabelName enables the usage of sort.Sort() with a slice of labels
+// ByLabelName enables the usage of sort.Sort() with a slice of labels.
 type ByLabelName []prompb.Label
 
 func (a ByLabelName) Len() int           { return len(a) }
@@ -115,14 +115,23 @@ var seps = []byte{'\xff'}
 // createAttributes creates a slice of Prometheus Labels with OTLP attributes and pairs of string values.
 // Unpaired string values are ignored. String pairs overwrite OTLP labels if collisions happen and
 // if logOnOverwrite is true, the overwrite is logged. Resulting label names are sanitized.
-func createAttributes(resource pcommon.Resource, attributes pcommon.Map, externalLabels map[string]string,
+// If settings.PromoteResourceAttributes is not empty, it's a set of resource attributes that should be promoted to labels.
+func createAttributes(resource pcommon.Resource, attributes pcommon.Map, settings Settings,
 	ignoreAttrs []string, logOnOverwrite bool, extras ...string) []prompb.Label {
 	resourceAttrs := resource.Attributes()
 	serviceName, haveServiceName := resourceAttrs.Get(conventions.AttributeServiceName)
 	instance, haveInstanceID := resourceAttrs.Get(conventions.AttributeServiceInstanceID)
 
+	promotedAttrs := make([]prompb.Label, 0, len(settings.PromoteResourceAttributes))
+	for _, name := range settings.PromoteResourceAttributes {
+		if value, exists := resourceAttrs.Get(name); exists {
+			promotedAttrs = append(promotedAttrs, prompb.Label{Name: name, Value: value.AsString()})
+		}
+	}
+	sort.Stable(ByLabelName(promotedAttrs))
+
 	// Calculate the maximum possible number of labels we could return so we can preallocate l
-	maxLabelCount := attributes.Len() + len(externalLabels) + len(extras)/2
+	maxLabelCount := attributes.Len() + len(settings.ExternalLabels) + len(promotedAttrs) + len(extras)/2
 
 	if haveServiceName {
 		maxLabelCount++
@@ -132,9 +141,6 @@ func createAttributes(resource pcommon.Resource, attributes pcommon.Map, externa
 		maxLabelCount++
 	}
 
-	// map ensures no duplicate label name
-	l := make(map[string]string, maxLabelCount)
-
 	// Ensure attributes are sorted by key for consistent merging of keys which
 	// collide when sanitized.
 	labels := make([]prompb.Label, 0, maxLabelCount)
@@ -148,6 +154,8 @@ func createAttributes(resource pcommon.Resource, attributes pcommon.Map, externa
 	})
 	sort.Stable(ByLabelName(labels))
 
+	// map ensures no duplicate label names.
+	l := make(map[string]string, maxLabelCount)
 	for _, label := range labels {
 		var finalKey = prometheustranslator.NormalizeLabel(label.Name)
 		if existingValue, alreadyExists := l[finalKey]; alreadyExists {
@@ -157,6 +165,13 @@ func createAttributes(resource pcommon.Resource, attributes pcommon.Map, externa
 		}
 	}
 
+	for _, lbl := range promotedAttrs {
+		normalized := prometheustranslator.NormalizeLabel(lbl.Name)
+		if _, exists := l[normalized]; !exists {
+			l[normalized] = lbl.Value
+		}
+	}
+
 	// Map service.name + service.namespace to job
 	if haveServiceName {
 		val := serviceName.AsString()
@@ -169,7 +184,7 @@ func createAttributes(resource pcommon.Resource, attributes pcommon.Map, externa
 	if haveInstanceID {
 		l[model.InstanceLabel] = instance.AsString()
 	}
-	for key, value := range externalLabels {
+	for key, value := range settings.ExternalLabels {
 		// External labels have already been sanitized
 		if _, alreadyExists := l[key]; alreadyExists {
 			// Skip external labels if they are overridden by metric attributes
@@ -232,7 +247,7 @@ func (c *PrometheusConverter) addHistogramDataPoints(dataPoints pmetric.Histogra
 	for x := 0; x < dataPoints.Len(); x++ {
 		pt := dataPoints.At(x)
 		timestamp := convertTimeStamp(pt.Timestamp())
-		baseLabels := createAttributes(resource, pt.Attributes(), settings.ExternalLabels, nil, false)
+		baseLabels := createAttributes(resource, pt.Attributes(), settings, nil, false)
 
 		// If the sum is unset, it indicates the _sum metric point should be
 		// omitted
@@ -408,7 +423,7 @@ func (c *PrometheusConverter) addSummaryDataPoints(dataPoints pmetric.SummaryDat
 	for x := 0; x < dataPoints.Len(); x++ {
 		pt := dataPoints.At(x)
 		timestamp := convertTimeStamp(pt.Timestamp())
-		baseLabels := createAttributes(resource, pt.Attributes(), settings.ExternalLabels, nil, false)
+		baseLabels := createAttributes(resource, pt.Attributes(), settings, nil, false)
 
 		// treat sum as a sample in an individual TimeSeries
 		sum := &prompb.Sample{
@@ -554,7 +569,8 @@ func addResourceTargetInfo(resource pcommon.Resource, settings Settings, timesta
 		name = settings.Namespace + "_" + name
 	}
 
-	labels := createAttributes(resource, attributes, settings.ExternalLabels, identifyingAttrs, false, model.MetricNameLabel, name)
+	settings.PromoteResourceAttributes = nil
+	labels := createAttributes(resource, attributes, settings, identifyingAttrs, false, model.MetricNameLabel, name)
 	haveIdentifier := false
 	for _, l := range labels {
 		if l.Name == model.JobLabel || l.Name == model.InstanceLabel {

storage/remote/otlptranslator/prometheusremotewrite/helper_test.go

@@ -0,0 +1,161 @@
+// Copyright 2024 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 prometheusremotewrite
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.opentelemetry.io/collector/pdata/pcommon"
+
+	"github.com/prometheus/prometheus/prompb"
+)
+
+func TestCreateAttributes(t *testing.T) {
+	resourceAttrs := map[string]string{
+		"service.name":        "service name",
+		"service.instance.id": "service ID",
+		"existent-attr":       "resource value",
+		// This one is for testing conflict with metric attribute.
+		"metric-attr": "resource value",
+		// This one is for testing conflict with auto-generated job attribute.
+		"job": "resource value",
+		// This one is for testing conflict with auto-generated instance attribute.
+		"instance": "resource value",
+	}
+
+	resource := pcommon.NewResource()
+	for k, v := range resourceAttrs {
+		resource.Attributes().PutStr(k, v)
+	}
+	attrs := pcommon.NewMap()
+	attrs.PutStr("__name__", "test_metric")
+	attrs.PutStr("metric-attr", "metric value")
+
+	testCases := []struct {
+		name                      string
+		promoteResourceAttributes []string
+		expectedLabels            []prompb.Label
+	}{
+		{
+			name:                      "Successful conversion without resource attribute promotion",
+			promoteResourceAttributes: nil,
+			expectedLabels: []prompb.Label{
+				{
+					Name:  "__name__",
+					Value: "test_metric",
+				},
+				{
+					Name:  "instance",
+					Value: "service ID",
+				},
+				{
+					Name:  "job",
+					Value: "service name",
+				},
+				{
+					Name:  "metric_attr",
+					Value: "metric value",
+				},
+			},
+		},
+		{
+			name:                      "Successful conversion with resource attribute promotion",
+			promoteResourceAttributes: []string{"non-existent-attr", "existent-attr"},
+			expectedLabels: []prompb.Label{
+				{
+					Name:  "__name__",
+					Value: "test_metric",
+				},
+				{
+					Name:  "instance",
+					Value: "service ID",
+				},
+				{
+					Name:  "job",
+					Value: "service name",
+				},
+				{
+					Name:  "metric_attr",
+					Value: "metric value",
+				},
+				{
+					Name:  "existent_attr",
+					Value: "resource value",
+				},
+			},
+		},
+		{
+			name:                      "Successful conversion with resource attribute promotion, conflicting resource attributes are ignored",
+			promoteResourceAttributes: []string{"non-existent-attr", "existent-attr", "metric-attr", "job", "instance"},
+			expectedLabels: []prompb.Label{
+				{
+					Name:  "__name__",
+					Value: "test_metric",
+				},
+				{
+					Name:  "instance",
+					Value: "service ID",
+				},
+				{
+					Name:  "job",
+					Value: "service name",
+				},
+				{
+					Name:  "existent_attr",
+					Value: "resource value",
+				},
+				{
+					Name:  "metric_attr",
+					Value: "metric value",
+				},
+			},
+		},
+		{
+			name:                      "Successful conversion with resource attribute promotion, attributes are only promoted once",
+			promoteResourceAttributes: []string{"existent-attr", "existent-attr"},
+			expectedLabels: []prompb.Label{
+				{
+					Name:  "__name__",
+					Value: "test_metric",
+				},
+				{
+					Name:  "instance",
+					Value: "service ID",
+				},
+				{
+					Name:  "job",
+					Value: "service name",
+				},
+				{
+					Name:  "existent_attr",
+					Value: "resource value",
+				},
+				{
+					Name:  "metric_attr",
+					Value: "metric value",
+				},
+			},
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			settings := Settings{
+				PromoteResourceAttributes: tc.promoteResourceAttributes,
+			}
+			lbls := createAttributes(resource, attrs, settings, nil, false)
+
+			assert.ElementsMatch(t, lbls, tc.expectedLabels)
+		})
+	}
+}

storage/remote/otlptranslator/prometheusremotewrite/histograms.go

@@ -45,7 +45,7 @@ func (c *PrometheusConverter) addExponentialHistogramDataPoints(dataPoints pmetr
 		lbls := createAttributes(
 			resource,
 			pt.Attributes(),
-			settings.ExternalLabels,
+			settings,
 			nil,
 			true,
 			model.MetricNameLabel,

storage/remote/otlptranslator/prometheusremotewrite/metrics_to_prw.go

@@ -36,6 +36,7 @@ type Settings struct {
 	ExportCreatedMetric       bool
 	AddMetricSuffixes         bool
 	SendMetadata              bool
+	PromoteResourceAttributes []string
 }
 
 // PrometheusConverter converts from OTel write format to Prometheus remote write format.

storage/remote/otlptranslator/prometheusremotewrite/number_data_points.go

@@ -34,7 +34,7 @@ func (c *PrometheusConverter) addGaugeNumberDataPoints(dataPoints pmetric.Number
 		labels := createAttributes(
 			resource,
 			pt.Attributes(),
-			settings.ExternalLabels,
+			settings,
 			nil,
 			true,
 			model.MetricNameLabel,
@@ -64,7 +64,7 @@ func (c *PrometheusConverter) addSumNumberDataPoints(dataPoints pmetric.NumberDa
 		lbls := createAttributes(
 			resource,
 			pt.Attributes(),
-			settings.ExternalLabels,
+			settings,
 			nil,
 			true,
 			model.MetricNameLabel,

storage/remote/queue_manager.go

@@ -232,7 +232,7 @@ func newQueueManagerMetrics(r prometheus.Registerer, rn, e string) *queueManager
 			Namespace:   namespace,
 			Subsystem:   subsystem,
 			Name:        "queue_highest_sent_timestamp_seconds",
-			Help:        "Timestamp from a WAL sample, the highest timestamp successfully sent by this queue, in seconds since epoch.",
+			Help:        "Timestamp from a WAL sample, the highest timestamp successfully sent by this queue, in seconds since epoch. Initialized to 0 when no data has been sent yet.",
 			ConstLabels: constLabels,
 		}),
 	}
@@ -391,7 +391,7 @@ func (m *queueManagerMetrics) unregister() {
 // external timeseries database.
 type WriteClient interface {
 	// Store stores the given samples in the remote storage.
-	Store(ctx context.Context, req []byte, retryAttempt int) error
+	Store(ctx context.Context, req []byte, retryAttempt int) (WriteResponseStats, error)
 	// Name uniquely identifies the remote storage.
 	Name() string
 	// Endpoint is the remote read or write endpoint for the storage client.
@@ -597,14 +597,15 @@ func (t *QueueManager) sendMetadataWithBackoff(ctx context.Context, metadata []p
 		}
 
 		begin := time.Now()
-		err := t.storeClient.Store(ctx, req, try)
+		// Ignoring WriteResponseStats, because there is nothing for metadata, since it's
+		// embedded in v2 calls now, and we do v1 here.
+		_, err := t.storeClient.Store(ctx, req, try)
 		t.metrics.sentBatchDuration.Observe(time.Since(begin).Seconds())
 
 		if err != nil {
 			span.RecordError(err)
 			return err
 		}
-
 		return nil
 	}
 
@@ -1108,9 +1109,9 @@ func (t *QueueManager) shouldReshard(desiredShards int) bool {
 	if desiredShards == t.numShards {
 		return false
 	}
-	// We shouldn't reshard if Prometheus hasn't been able to send to the
-	// remote endpoint successfully within some period of time.
-	minSendTimestamp := time.Now().Add(-2 * time.Duration(t.cfg.BatchSendDeadline)).Unix()
+	// We shouldn't reshard if Prometheus hasn't been able to send
+	// since the last time it checked if it should reshard.
+	minSendTimestamp := time.Now().Add(-1 * shardUpdateDuration).Unix()
 	lsts := t.lastSendTimestamp.Load()
 	if lsts < minSendTimestamp {
 		level.Warn(t.logger).Log("msg", "Skipping resharding, last successful send was beyond threshold", "lastSendTimestamp", lsts, "minSendTimestamp", minSendTimestamp)
@@ -1468,6 +1469,8 @@ func (q *queue) FlushAndShutdown(done <-chan struct{}) {
 	for q.tryEnqueueingBatch(done) {
 		time.Sleep(time.Second)
 	}
+	q.batchMtx.Lock()
+	defer q.batchMtx.Unlock()
 	q.batch = nil
 	close(q.batchQueue)
 }
@@ -1659,8 +1662,8 @@ func populateTimeSeries(batch []timeSeries, pendingData []prompb.TimeSeries, sen
 
 func (s *shards) sendSamples(ctx context.Context, samples []prompb.TimeSeries, sampleCount, exemplarCount, histogramCount int, pBuf *proto.Buffer, buf *[]byte, enc Compression) error {
 	begin := time.Now()
-	err := s.sendSamplesWithBackoff(ctx, samples, sampleCount, exemplarCount, histogramCount, 0, pBuf, buf, enc)
-	s.updateMetrics(ctx, err, sampleCount, exemplarCount, histogramCount, 0, time.Since(begin))
+	rs, err := s.sendSamplesWithBackoff(ctx, samples, sampleCount, exemplarCount, histogramCount, 0, pBuf, buf, enc)
+	s.updateMetrics(ctx, err, sampleCount, exemplarCount, histogramCount, 0, rs, time.Since(begin))
 	return err
 }
 
@@ -1668,17 +1671,29 @@ func (s *shards) sendSamples(ctx context.Context, samples []prompb.TimeSeries, s
 // See https://github.com/prometheus/prometheus/issues/14409
 func (s *shards) sendV2Samples(ctx context.Context, samples []writev2.TimeSeries, labels []string, sampleCount, exemplarCount, histogramCount, metadataCount int, pBuf, buf *[]byte, enc Compression) error {
 	begin := time.Now()
-	err := s.sendV2SamplesWithBackoff(ctx, samples, labels, sampleCount, exemplarCount, histogramCount, metadataCount, pBuf, buf, enc)
-	s.updateMetrics(ctx, err, sampleCount, exemplarCount, histogramCount, metadataCount, time.Since(begin))
+	rs, err := s.sendV2SamplesWithBackoff(ctx, samples, labels, sampleCount, exemplarCount, histogramCount, metadataCount, pBuf, buf, enc)
+	s.updateMetrics(ctx, err, sampleCount, exemplarCount, histogramCount, metadataCount, rs, time.Since(begin))
 	return err
 }
 
-func (s *shards) updateMetrics(_ context.Context, err error, sampleCount, exemplarCount, histogramCount, metadataCount int, duration time.Duration) {
+func (s *shards) updateMetrics(_ context.Context, err error, sampleCount, exemplarCount, histogramCount, metadataCount int, rs WriteResponseStats, duration time.Duration) {
+	// Partial errors may happen -- account for that.
+	sampleDiff := sampleCount - rs.Samples
+	if sampleDiff > 0 {
+		s.qm.metrics.failedSamplesTotal.Add(float64(sampleDiff))
+	}
+	histogramDiff := histogramCount - rs.Histograms
+	if histogramDiff > 0 {
+		s.qm.metrics.failedHistogramsTotal.Add(float64(histogramDiff))
+	}
+	exemplarDiff := exemplarCount - rs.Exemplars
+	if exemplarDiff > 0 {
+		s.qm.metrics.failedExemplarsTotal.Add(float64(exemplarDiff))
+	}
 	if err != nil {
-		level.Error(s.qm.logger).Log("msg", "non-recoverable error", "count", sampleCount, "exemplarCount", exemplarCount, "histogramCount", histogramCount, "err", err)
-		s.qm.metrics.failedSamplesTotal.Add(float64(sampleCount))
-		s.qm.metrics.failedExemplarsTotal.Add(float64(exemplarCount))
-		s.qm.metrics.failedHistogramsTotal.Add(float64(histogramCount))
+		level.Error(s.qm.logger).Log("msg", "non-recoverable error", "failedSampleCount", sampleDiff, "failedHistogramCount", histogramDiff, "failedExemplarCount", exemplarDiff, "err", err)
+	} else if sampleDiff+exemplarDiff+histogramDiff > 0 {
+		level.Error(s.qm.logger).Log("msg", "we got 2xx status code from the Receiver yet statistics indicate some dat was not written; investigation needed", "failedSampleCount", sampleDiff, "failedHistogramCount", histogramDiff, "failedExemplarCount", exemplarDiff)
 	}
 
 	// These counters are used to calculate the dynamic sharding, and as such
@@ -1686,6 +1701,7 @@ func (s *shards) updateMetrics(_ context.Context, err error, sampleCount, exempl
 	s.qm.dataOut.incr(int64(sampleCount + exemplarCount + histogramCount + metadataCount))
 	s.qm.dataOutDuration.incr(int64(duration))
 	s.qm.lastSendTimestamp.Store(time.Now().Unix())
+
 	// Pending samples/exemplars/histograms also should be subtracted, as an error means
 	// they will not be retried.
 	s.qm.metrics.pendingSamples.Sub(float64(sampleCount))
@@ -1697,19 +1713,29 @@ func (s *shards) updateMetrics(_ context.Context, err error, sampleCount, exempl
 }
 
 // sendSamples to the remote storage with backoff for recoverable errors.
-func (s *shards) sendSamplesWithBackoff(ctx context.Context, samples []prompb.TimeSeries, sampleCount, exemplarCount, histogramCount, metadataCount int, pBuf *proto.Buffer, buf *[]byte, enc Compression) error {
+func (s *shards) sendSamplesWithBackoff(ctx context.Context, samples []prompb.TimeSeries, sampleCount, exemplarCount, histogramCount, metadataCount int, pBuf *proto.Buffer, buf *[]byte, enc Compression) (WriteResponseStats, error) {
 	// Build the WriteRequest with no metadata.
 	req, highest, lowest, err := buildWriteRequest(s.qm.logger, samples, nil, pBuf, buf, nil, enc)
 	s.qm.buildRequestLimitTimestamp.Store(lowest)
 	if err != nil {
 		// Failing to build the write request is non-recoverable, since it will
 		// only error if marshaling the proto to bytes fails.
-		return err
+		return WriteResponseStats{}, err
 	}
 
 	reqSize := len(req)
 	*buf = req
 
+	// Since we retry writes via attemptStore and sendWriteRequestWithBackoff we need
+	// to track the total amount of accepted data across the various attempts.
+	accumulatedStats := WriteResponseStats{}
+	var accumulatedStatsMu sync.Mutex
+	addStats := func(rs WriteResponseStats) {
+		accumulatedStatsMu.Lock()
+		accumulatedStats = accumulatedStats.Add(rs)
+		accumulatedStatsMu.Unlock()
+	}
+
 	// An anonymous function allows us to defer the completion of our per-try spans
 	// without causing a memory leak, and it has the nice effect of not propagating any
 	// parameters for sendSamplesWithBackoff/3.
@@ -1757,17 +1783,21 @@ func (s *shards) sendSamplesWithBackoff(ctx context.Context, samples []prompb.Ti
 		s.qm.metrics.exemplarsTotal.Add(float64(exemplarCount))
 		s.qm.metrics.histogramsTotal.Add(float64(histogramCount))
 		s.qm.metrics.metadataTotal.Add(float64(metadataCount))
-		err := s.qm.client().Store(ctx, *buf, try)
+		// Technically for v1, we will likely have empty response stats, but for
+		// newer Receivers this might be not, so used it in a best effort.
+		rs, err := s.qm.client().Store(ctx, *buf, try)
 		s.qm.metrics.sentBatchDuration.Observe(time.Since(begin).Seconds())
+		// TODO(bwplotka): Revisit this once we have Receivers doing retriable partial error
+		// so far we don't have those, so it's ok to potentially skew statistics.
+		addStats(rs)
 
-		if err != nil {
+		if err == nil {
+			return nil
+		}
 		span.RecordError(err)
 		return err
 	}
 
-		return nil
-	}
-
 	onRetry := func() {
 		s.qm.metrics.retriedSamplesTotal.Add(float64(sampleCount))
 		s.qm.metrics.retriedExemplarsTotal.Add(float64(exemplarCount))
@@ -1778,29 +1808,48 @@ func (s *shards) sendSamplesWithBackoff(ctx context.Context, samples []prompb.Ti
 	if errors.Is(err, context.Canceled) {
 		// When there is resharding, we cancel the context for this queue, which means the data is not sent.
 		// So we exit early to not update the metrics.
-		return err
+		return accumulatedStats, err
 	}
 
 	s.qm.metrics.sentBytesTotal.Add(float64(reqSize))
 	s.qm.metrics.highestSentTimestamp.Set(float64(highest / 1000))
 
-	return err
+	if err == nil && !accumulatedStats.Confirmed {
+		// No 2.0 response headers, and we sent v1 message, so likely it's 1.0 Receiver.
+		// Assume success, don't rely on headers.
+		return WriteResponseStats{
+			Samples:    sampleCount,
+			Histograms: histogramCount,
+			Exemplars:  exemplarCount,
+		}, nil
+	}
+	return accumulatedStats, err
 }
 
 // sendV2Samples to the remote storage with backoff for recoverable errors.
-func (s *shards) sendV2SamplesWithBackoff(ctx context.Context, samples []writev2.TimeSeries, labels []string, sampleCount, exemplarCount, histogramCount, metadataCount int, pBuf, buf *[]byte, enc Compression) error {
+func (s *shards) sendV2SamplesWithBackoff(ctx context.Context, samples []writev2.TimeSeries, labels []string, sampleCount, exemplarCount, histogramCount, metadataCount int, pBuf, buf *[]byte, enc Compression) (WriteResponseStats, error) {
 	// Build the WriteRequest with no metadata.
 	req, highest, lowest, err := buildV2WriteRequest(s.qm.logger, samples, labels, pBuf, buf, nil, enc)
 	s.qm.buildRequestLimitTimestamp.Store(lowest)
 	if err != nil {
 		// Failing to build the write request is non-recoverable, since it will
 		// only error if marshaling the proto to bytes fails.
-		return err
+		return WriteResponseStats{}, err
 	}
 
 	reqSize := len(req)
 	*buf = req
 
+	// Since we retry writes via attemptStore and sendWriteRequestWithBackoff we need
+	// to track the total amount of accepted data across the various attempts.
+	accumulatedStats := WriteResponseStats{}
+	var accumulatedStatsMu sync.Mutex
+	addStats := func(rs WriteResponseStats) {
+		accumulatedStatsMu.Lock()
+		accumulatedStats = accumulatedStats.Add(rs)
+		accumulatedStatsMu.Unlock()
+	}
+
 	// An anonymous function allows us to defer the completion of our per-try spans
 	// without causing a memory leak, and it has the nice effect of not propagating any
 	// parameters for sendSamplesWithBackoff/3.
@@ -1848,16 +1897,29 @@ func (s *shards) sendV2SamplesWithBackoff(ctx context.Context, samples []writev2
 		s.qm.metrics.exemplarsTotal.Add(float64(exemplarCount))
 		s.qm.metrics.histogramsTotal.Add(float64(histogramCount))
 		s.qm.metrics.metadataTotal.Add(float64(metadataCount))
-		err := s.qm.client().Store(ctx, *buf, try)
+		rs, err := s.qm.client().Store(ctx, *buf, try)
 		s.qm.metrics.sentBatchDuration.Observe(time.Since(begin).Seconds())
+		// TODO(bwplotka): Revisit this once we have Receivers doing retriable partial error
+		// so far we don't have those, so it's ok to potentially skew statistics.
+		addStats(rs)
 
-		if err != nil {
+		if err == nil {
+			// Check the case mentioned in PRW 2.0
+			// https://prometheus.io/docs/specs/remote_write_spec_2_0/#required-written-response-headers.
+			if sampleCount+histogramCount+exemplarCount > 0 && rs.NoDataWritten() {
+				err = fmt.Errorf("sent v2 request with %v samples, %v histograms and %v exemplars; got 2xx, but PRW 2.0 response header statistics indicate %v samples, %v histograms and %v exemplars were accepted;"+
+					" assumining failure e.g. the target only supports PRW 1.0 prometheus.WriteRequest, but does not check the Content-Type header correctly",
+					sampleCount, histogramCount, exemplarCount,
+					rs.Samples, rs.Histograms, rs.Exemplars,
+				)
 				span.RecordError(err)
 				return err
 			}
-
 			return nil
 		}
+		span.RecordError(err)
+		return err
+	}
 
 	onRetry := func() {
 		s.qm.metrics.retriedSamplesTotal.Add(float64(sampleCount))
@@ -1869,13 +1931,12 @@ func (s *shards) sendV2SamplesWithBackoff(ctx context.Context, samples []writev2
 	if errors.Is(err, context.Canceled) {
 		// When there is resharding, we cancel the context for this queue, which means the data is not sent.
 		// So we exit early to not update the metrics.
-		return err
+		return accumulatedStats, err
 	}
 
 	s.qm.metrics.sentBytesTotal.Add(float64(reqSize))
 	s.qm.metrics.highestSentTimestamp.Set(float64(highest / 1000))
-
-	return err
+	return accumulatedStats, err
 }
 
 func populateV2TimeSeries(symbolTable *writev2.SymbolsTable, batch []timeSeries, pendingData []writev2.TimeSeries, sendExemplars, sendNativeHistograms bool) (int, int, int, int) {

storage/remote/queue_manager_test.go

@@ -60,7 +60,7 @@ func newHighestTimestampMetric() *maxTimestamp {
 			Namespace: namespace,
 			Subsystem: subsystem,
 			Name:      "highest_timestamp_in_seconds",
-			Help:      "Highest timestamp that has come into the remote storage via the Appender interface, in seconds since epoch.",
+			Help:      "Highest timestamp that has come into the remote storage via the Appender interface, in seconds since epoch. Initialized to 0 when no data has been received yet",
 		}),
 	}
 }
@@ -118,10 +118,10 @@ func TestBasicContentNegotiation(t *testing.T) {
 			expectFail: true,
 		},
 		{
-			name:           "v2 talks to v1 that tries to unmarshal v2 payload with v1 proto",
+			name:           "v2 talks to (broken) v1 that tries to unmarshal v2 payload with v1 proto",
 			senderProtoMsg: config.RemoteWriteProtoMsgV2, receiverProtoMsg: config.RemoteWriteProtoMsgV1,
 			injectErrs: []error{nil},
-			expectFail: true, // invalid request, no timeseries
+			expectFail: true, // We detect this thanks to https://github.com/prometheus/prometheus/issues/14359
 		},
 		// Opposite, v1 talking to v2 only server.
 		{
@@ -130,12 +130,6 @@ func TestBasicContentNegotiation(t *testing.T) {
 			injectErrs: []error{errors.New("pretend unrecoverable err")},
 			expectFail: true,
 		},
-		{
-			name:           "v1 talks to (broken) v2 that tries to unmarshal v1 payload with v2 proto",
-			senderProtoMsg: config.RemoteWriteProtoMsgV1, receiverProtoMsg: config.RemoteWriteProtoMsgV2,
-			injectErrs: []error{nil},
-			expectFail: true, // invalid request, no timeseries
-		},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
 			dir := t.TempDir()
@@ -182,7 +176,6 @@ func TestBasicContentNegotiation(t *testing.T) {
 			if !tc.expectFail {
 				// No error expected, so wait for data.
 				c.waitForExpectedData(t, 5*time.Second)
-				require.Equal(t, 1, c.writesReceived)
 				require.Equal(t, 0.0, client_testutil.ToFloat64(qm.metrics.failedSamplesTotal))
 			} else {
 				// Wait for failure to be recorded in metrics.
@@ -190,11 +183,10 @@ func TestBasicContentNegotiation(t *testing.T) {
 				defer cancel()
 				require.NoError(t, runutil.Retry(500*time.Millisecond, ctx.Done(), func() error {
 					if client_testutil.ToFloat64(qm.metrics.failedSamplesTotal) != 1.0 {
-						return errors.New("expected one sample failed in qm metrics")
+						return fmt.Errorf("expected one sample failed in qm metrics; got %v", client_testutil.ToFloat64(qm.metrics.failedSamplesTotal))
 					}
 					return nil
 				}))
-				require.Equal(t, 0, c.writesReceived)
 			}
 
 			// samplesTotal means attempts.
@@ -711,32 +703,35 @@ func TestShouldReshard(t *testing.T) {
 		startingShards                           int
 		samplesIn, samplesOut, lastSendTimestamp int64
 		expectedToReshard                        bool
+		sendDeadline                             model.Duration
 	}
 	cases := []testcase{
 		{
-			// Resharding shouldn't take place if the last successful send was > batch send deadline*2 seconds ago.
+			// resharding shouldn't take place if we haven't successfully sent
+			// since the last shardUpdateDuration, even if the send deadline is very low
 			startingShards:    10,
 			samplesIn:         1000,
 			samplesOut:        10,
-			lastSendTimestamp: time.Now().Unix() - int64(3*time.Duration(config.DefaultQueueConfig.BatchSendDeadline)/time.Second),
+			lastSendTimestamp: time.Now().Unix() - int64(shardUpdateDuration),
 			expectedToReshard: false,
+			sendDeadline:      model.Duration(100 * time.Millisecond),
 		},
 		{
-			startingShards:    5,
+			startingShards:    10,
 			samplesIn:         1000,
 			samplesOut:        10,
 			lastSendTimestamp: time.Now().Unix(),
 			expectedToReshard: true,
+			sendDeadline:      config.DefaultQueueConfig.BatchSendDeadline,
 		},
 	}
 
 	for _, c := range cases {
-		_, m := newTestClientAndQueueManager(t, defaultFlushDeadline, config.RemoteWriteProtoMsgV1)
+		_, m := newTestClientAndQueueManager(t, time.Duration(c.sendDeadline), config.RemoteWriteProtoMsgV1)
 		m.numShards = c.startingShards
 		m.dataIn.incr(c.samplesIn)
 		m.dataOut.incr(c.samplesOut)
 		m.lastSendTimestamp.Store(c.lastSendTimestamp)
-
 		m.Start()
 
 		desiredShards := m.calculateDesiredShards()
@@ -764,10 +759,10 @@ func TestDisableReshardOnRetry(t *testing.T) {
 		metrics = newQueueManagerMetrics(nil, "", "")
 
 		client = &MockWriteClient{
-			StoreFunc: func(ctx context.Context, b []byte, i int) error {
+			StoreFunc: func(ctx context.Context, b []byte, i int) (WriteResponseStats, error) {
 				onStoreCalled()
 
-				return RecoverableError{
+				return WriteResponseStats{}, RecoverableError{
 					error:      fmt.Errorf("fake error"),
 					retryAfter: model.Duration(retryAfter),
 				}
@@ -1113,14 +1108,14 @@ func (c *TestWriteClient) SetReturnError(err error) {
 	c.returnError = err
 }
 
-func (c *TestWriteClient) Store(_ context.Context, req []byte, _ int) error {
+func (c *TestWriteClient) Store(_ context.Context, req []byte, _ int) (WriteResponseStats, error) {
 	c.mtx.Lock()
 	defer c.mtx.Unlock()
 	if c.storeWait > 0 {
 		time.Sleep(c.storeWait)
 	}
 	if c.returnError != nil {
-		return c.returnError
+		return WriteResponseStats{}, c.returnError
 	}
 	// nil buffers are ok for snappy, ignore cast error.
 	if c.buf != nil {
@@ -1130,14 +1125,14 @@ func (c *TestWriteClient) Store(_ context.Context, req []byte, _ int) error {
 	reqBuf, err := snappy.Decode(c.buf, req)
 	c.buf = reqBuf
 	if err != nil {
-		return err
+		return WriteResponseStats{}, err
 	}
 
 	// Check if we've been told to inject err for this call.
 	if len(c.injectedErrs) > 0 {
 		c.currErr++
 		if err = c.injectedErrs[c.currErr]; err != nil {
-			return err
+			return WriteResponseStats{}, err
 		}
 	}
 
@@ -1156,13 +1151,10 @@ func (c *TestWriteClient) Store(_ context.Context, req []byte, _ int) error {
 		}
 	}
 	if err != nil {
-		return err
-	}
-
-	if len(reqProto.Timeseries) == 0 && len(reqProto.Metadata) == 0 {
-		return errors.New("invalid request, no timeseries")
+		return WriteResponseStats{}, err
 	}
 
+	rs := WriteResponseStats{}
 	b := labels.NewScratchBuilder(0)
 	for _, ts := range reqProto.Timeseries {
 		labels := ts.ToLabels(&b, nil)
@@ -1170,10 +1162,12 @@ func (c *TestWriteClient) Store(_ context.Context, req []byte, _ int) error {
 		if len(ts.Samples) > 0 {
 			c.receivedSamples[tsID] = append(c.receivedSamples[tsID], ts.Samples...)
 		}
+		rs.Samples += len(ts.Samples)
 
 		if len(ts.Exemplars) > 0 {
 			c.receivedExemplars[tsID] = append(c.receivedExemplars[tsID], ts.Exemplars...)
 		}
+		rs.Exemplars += len(ts.Exemplars)
 
 		for _, h := range ts.Histograms {
 			if h.IsFloatHistogram() {
@@ -1182,13 +1176,14 @@ func (c *TestWriteClient) Store(_ context.Context, req []byte, _ int) error {
 				c.receivedHistograms[tsID] = append(c.receivedHistograms[tsID], h)
 			}
 		}
+		rs.Histograms += len(ts.Histograms)
 	}
 	for _, m := range reqProto.Metadata {
 		c.receivedMetadata[m.MetricFamilyName] = append(c.receivedMetadata[m.MetricFamilyName], m)
 	}
 
 	c.writesReceived++
-	return nil
+	return rs, nil
 }
 
 func (c *TestWriteClient) Name() string {
@@ -1256,10 +1251,10 @@ func NewTestBlockedWriteClient() *TestBlockingWriteClient {
 	return &TestBlockingWriteClient{}
 }
 
-func (c *TestBlockingWriteClient) Store(ctx context.Context, _ []byte, _ int) error {
+func (c *TestBlockingWriteClient) Store(ctx context.Context, _ []byte, _ int) (WriteResponseStats, error) {
 	c.numCalls.Inc()
 	<-ctx.Done()
-	return nil
+	return WriteResponseStats{}, nil
 }
 
 func (c *TestBlockingWriteClient) NumCalls() uint64 {
@@ -1278,19 +1273,19 @@ func (c *TestBlockingWriteClient) Endpoint() string {
 type NopWriteClient struct{}
 
 func NewNopWriteClient() *NopWriteClient { return &NopWriteClient{} }
-func (c *NopWriteClient) Store(context.Context, []byte, int) error {
-	return nil
+func (c *NopWriteClient) Store(context.Context, []byte, int) (WriteResponseStats, error) {
+	return WriteResponseStats{}, nil
 }
 func (c *NopWriteClient) Name() string     { return "nopwriteclient" }
 func (c *NopWriteClient) Endpoint() string { return "http://test-remote.com/1234" }
 
 type MockWriteClient struct {
-	StoreFunc    func(context.Context, []byte, int) error
+	StoreFunc    func(context.Context, []byte, int) (WriteResponseStats, error)
 	NameFunc     func() string
 	EndpointFunc func() string
 }
 
-func (c *MockWriteClient) Store(ctx context.Context, bb []byte, n int) error {
+func (c *MockWriteClient) Store(ctx context.Context, bb []byte, n int) (WriteResponseStats, error) {
 	return c.StoreFunc(ctx, bb, n)
 }
 func (c *MockWriteClient) Name() string     { return c.NameFunc() }

storage/remote/read.go

@@ -210,13 +210,13 @@ func (q querier) addExternalLabels(ms []*labels.Matcher) ([]*labels.Matcher, []s
 }
 
 // LabelValues implements storage.Querier and is a noop.
-func (q *querier) LabelValues(context.Context, string, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (q *querier) LabelValues(context.Context, string, *storage.LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	// TODO: Implement: https://github.com/prometheus/prometheus/issues/3351
 	return nil, nil, errors.New("not implemented")
 }
 
 // LabelNames implements storage.Querier and is a noop.
-func (q *querier) LabelNames(context.Context, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (q *querier) LabelNames(context.Context, *storage.LabelHints, ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	// TODO: Implement: https://github.com/prometheus/prometheus/issues/3351
 	return nil, nil, errors.New("not implemented")
 }

storage/remote/read_handler.go

@@ -202,16 +202,34 @@ func (h *readHandler) remoteReadStreamedXORChunks(ctx context.Context, w http.Re
 				return err
 			}
 
-			chunks := h.getChunkSeriesSet(ctx, query, filteredMatchers)
-			if err := chunks.Err(); err != nil {
+			querier, err := h.queryable.ChunkQuerier(query.StartTimestampMs, query.EndTimestampMs)
+			if err != nil {
 				return err
 			}
+			defer func() {
+				if err := querier.Close(); err != nil {
+					level.Warn(h.logger).Log("msg", "Error on chunk querier close", "err", err.Error())
+				}
+			}()
+
+			var hints *storage.SelectHints
+			if query.Hints != nil {
+				hints = &storage.SelectHints{
+					Start:    query.Hints.StartMs,
+					End:      query.Hints.EndMs,
+					Step:     query.Hints.StepMs,
+					Func:     query.Hints.Func,
+					Grouping: query.Hints.Grouping,
+					Range:    query.Hints.RangeMs,
+					By:       query.Hints.By,
+				}
+			}
 
 			ws, err := StreamChunkedReadResponses(
 				NewChunkedWriter(w, f),
 				int64(i),
 				// The streaming API has to provide the series sorted.
-				chunks,
+				querier.Select(ctx, true, hints, filteredMatchers...),
 				sortedExternalLabels,
 				h.remoteReadMaxBytesInFrame,
 				h.marshalPool,
@@ -236,35 +254,6 @@ func (h *readHandler) remoteReadStreamedXORChunks(ctx context.Context, w http.Re
 	}
 }
 
-// getChunkSeriesSet executes a query to retrieve a ChunkSeriesSet,
-// encapsulating the operation in its own function to ensure timely release of
-// the querier resources.
-func (h *readHandler) getChunkSeriesSet(ctx context.Context, query *prompb.Query, filteredMatchers []*labels.Matcher) storage.ChunkSeriesSet {
-	querier, err := h.queryable.ChunkQuerier(query.StartTimestampMs, query.EndTimestampMs)
-	if err != nil {
-		return storage.ErrChunkSeriesSet(err)
-	}
-	defer func() {
-		if err := querier.Close(); err != nil {
-			level.Warn(h.logger).Log("msg", "Error on chunk querier close", "err", err.Error())
-		}
-	}()
-
-	var hints *storage.SelectHints
-	if query.Hints != nil {
-		hints = &storage.SelectHints{
-			Start:    query.Hints.StartMs,
-			End:      query.Hints.EndMs,
-			Step:     query.Hints.StepMs,
-			Func:     query.Hints.Func,
-			Grouping: query.Hints.Grouping,
-			Range:    query.Hints.RangeMs,
-			By:       query.Hints.By,
-		}
-	}
-	return querier.Select(ctx, true, hints, filteredMatchers...)
-}
-
 // filterExtLabelsFromMatchers change equality matchers which match external labels
 // to a matcher that looks for an empty label,
 // as that label should not be present in the storage.

storage/remote/stats.go

@@ -0,0 +1,107 @@
+// Copyright 2024 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 remote
+
+import (
+	"errors"
+	"net/http"
+	"strconv"
+)
+
+const (
+	rw20WrittenSamplesHeader    = "X-Prometheus-Remote-Write-Samples-Written"
+	rw20WrittenHistogramsHeader = "X-Prometheus-Remote-Write-Histograms-Written"
+	rw20WrittenExemplarsHeader  = "X-Prometheus-Remote-Write-Exemplars-Written"
+)
+
+// WriteResponseStats represents the response write statistics specified in https://github.com/prometheus/docs/pull/2486
+type WriteResponseStats struct {
+	// Samples represents X-Prometheus-Remote-Write-Written-Samples
+	Samples int
+	// Histograms represents X-Prometheus-Remote-Write-Written-Histograms
+	Histograms int
+	// Exemplars represents X-Prometheus-Remote-Write-Written-Exemplars
+	Exemplars int
+
+	// Confirmed means we can trust those statistics from the point of view
+	// of the PRW 2.0 spec. When parsed from headers, it means we got at least one
+	// response header from the Receiver to confirm those numbers, meaning it must
+	// be a at least 2.0 Receiver. See ParseWriteResponseStats for details.
+	Confirmed bool
+}
+
+// NoDataWritten returns true if statistics indicate no data was written.
+func (s WriteResponseStats) NoDataWritten() bool {
+	return (s.Samples + s.Histograms + s.Exemplars) == 0
+}
+
+// AllSamples returns both float and histogram sample numbers.
+func (s WriteResponseStats) AllSamples() int {
+	return s.Samples + s.Histograms
+}
+
+// Add returns the sum of this WriteResponseStats plus the given WriteResponseStats.
+func (s WriteResponseStats) Add(rs WriteResponseStats) WriteResponseStats {
+	s.Confirmed = rs.Confirmed
+	s.Samples += rs.Samples
+	s.Histograms += rs.Histograms
+	s.Exemplars += rs.Exemplars
+	return s
+}
+
+// SetHeaders sets response headers in a given response writer.
+// Make sure to use it before http.ResponseWriter.WriteHeader and .Write.
+func (s WriteResponseStats) SetHeaders(w http.ResponseWriter) {
+	h := w.Header()
+	h.Set(rw20WrittenSamplesHeader, strconv.Itoa(s.Samples))
+	h.Set(rw20WrittenHistogramsHeader, strconv.Itoa(s.Histograms))
+	h.Set(rw20WrittenExemplarsHeader, strconv.Itoa(s.Exemplars))
+}
+
+// ParseWriteResponseStats returns WriteResponseStats parsed from the response headers.
+//
+// As per 2.0 spec, missing header means 0. However, abrupt HTTP errors, 1.0 Receivers
+// or buggy 2.0 Receivers might result in no response headers specified and that
+// might NOT necessarily mean nothing was written. To represent that we set
+// s.Confirmed = true only when see at least on response header.
+//
+// Error is returned when any of the header fails to parse as int64.
+func ParseWriteResponseStats(r *http.Response) (s WriteResponseStats, err error) {
+	var (
+		errs []error
+		h    = r.Header
+	)
+	if v := h.Get(rw20WrittenSamplesHeader); v != "" { // Empty means zero.
+		s.Confirmed = true
+		if s.Samples, err = strconv.Atoi(v); err != nil {
+			s.Samples = 0
+			errs = append(errs, err)
+		}
+	}
+	if v := h.Get(rw20WrittenHistogramsHeader); v != "" { // Empty means zero.
+		s.Confirmed = true
+		if s.Histograms, err = strconv.Atoi(v); err != nil {
+			s.Histograms = 0
+			errs = append(errs, err)
+		}
+	}
+	if v := h.Get(rw20WrittenExemplarsHeader); v != "" { // Empty means zero.
+		s.Confirmed = true
+		if s.Exemplars, err = strconv.Atoi(v); err != nil {
+			s.Exemplars = 0
+			errs = append(errs, err)
+		}
+	}
+	return s, errors.Join(errs...)
+}

storage/remote/write.go

@@ -100,7 +100,7 @@ func NewWriteStorage(logger log.Logger, reg prometheus.Registerer, dir string, f
 				Namespace: namespace,
 				Subsystem: subsystem,
 				Name:      "highest_timestamp_in_seconds",
-				Help:      "Highest timestamp that has come into the remote storage via the Appender interface, in seconds since epoch.",
+				Help:      "Highest timestamp that has come into the remote storage via the Appender interface, in seconds since epoch. Initialized to 0 when no data has been received yet.",
 			}),
 		},
 	}
@@ -176,6 +176,7 @@ func (rws *WriteStorage) ApplyConfig(conf *config.Config) error {
 			HTTPClientConfig: rwConf.HTTPClientConfig,
 			SigV4Config:      rwConf.SigV4Config,
 			AzureADConfig:    rwConf.AzureADConfig,
+			GoogleIAMConfig:  rwConf.GoogleIAMConfig,
 			Headers:          rwConf.Headers,
 			RetryOnRateLimit: rwConf.QueueConfig.RetryOnRateLimit,
 		})

storage/remote/write_handler.go

@@ -27,6 +27,7 @@ import (
 	"github.com/gogo/protobuf/proto"
 	"github.com/golang/snappy"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
 
 	"github.com/prometheus/prometheus/config"
 	"github.com/prometheus/prometheus/model/exemplar"
@@ -44,6 +45,7 @@ type writeHandler struct {
 	appendable storage.Appendable
 
 	samplesWithInvalidLabelsTotal  prometheus.Counter
+	samplesAppendedWithoutMetadata prometheus.Counter
 
 	acceptedProtoMsgs map[config.RemoteWriteProtoMsg]struct{}
 }
@@ -52,6 +54,9 @@ const maxAheadTime = 10 * time.Minute
 
 // NewWriteHandler creates a http.Handler that accepts remote write requests with
 // the given message in acceptedProtoMsgs and writes them to the provided appendable.
+//
+// NOTE(bwplotka): When accepting v2 proto and spec, partial writes are possible
+// as per https://prometheus.io/docs/specs/remote_write_spec_2_0/#partial-write.
 func NewWriteHandler(logger log.Logger, reg prometheus.Registerer, appendable storage.Appendable, acceptedProtoMsgs []config.RemoteWriteProtoMsg) http.Handler {
 	protoMsgs := map[config.RemoteWriteProtoMsg]struct{}{}
 	for _, acc := range acceptedProtoMsgs {
@@ -61,15 +66,18 @@ func NewWriteHandler(logger log.Logger, reg prometheus.Registerer, appendable st
 		logger:            logger,
 		appendable:        appendable,
 		acceptedProtoMsgs: protoMsgs,
-		samplesWithInvalidLabelsTotal: prometheus.NewCounter(prometheus.CounterOpts{
+		samplesWithInvalidLabelsTotal: promauto.With(reg).NewCounter(prometheus.CounterOpts{
 			Namespace: "prometheus",
 			Subsystem: "api",
 			Name:      "remote_write_invalid_labels_samples_total",
-			Help:      "The total number of remote write samples which contains invalid labels.",
+			Help:      "The total number of received remote write samples and histogram samples which were rejected due to invalid labels.",
+		}),
+		samplesAppendedWithoutMetadata: promauto.With(reg).NewCounter(prometheus.CounterOpts{
+			Namespace: "prometheus",
+			Subsystem: "api",
+			Name:      "remote_write_without_metadata_appended_samples_total",
+			Help:      "The total number of received remote write samples (and histogram samples) which were ingested without corresponding metadata.",
 		}),
-	}
-	if reg != nil {
-		reg.MustRegister(h.samplesWithInvalidLabelsTotal)
 	}
 	return h
 }
@@ -108,15 +116,15 @@ func (h *writeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		contentType = appProtoContentType
 	}
 
-	msg, err := h.parseProtoMsg(contentType)
+	msgType, err := h.parseProtoMsg(contentType)
 	if err != nil {
 		level.Error(h.logger).Log("msg", "Error decoding remote write request", "err", err)
 		http.Error(w, err.Error(), http.StatusUnsupportedMediaType)
 		return
 	}
 
-	if _, ok := h.acceptedProtoMsgs[msg]; !ok {
-		err := fmt.Errorf("%v protobuf message is not accepted by this server; accepted %v", msg, func() (ret []string) {
+	if _, ok := h.acceptedProtoMsgs[msgType]; !ok {
+		err := fmt.Errorf("%v protobuf message is not accepted by this server; accepted %v", msgType, func() (ret []string) {
 			for k := range h.acceptedProtoMsgs {
 				ret = append(ret, string(k))
 			}
@@ -154,100 +162,111 @@ func (h *writeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Now we have a decompressed buffer we can unmarshal it.
-	switch msg {
-	case config.RemoteWriteProtoMsgV1:
+
+	if msgType == config.RemoteWriteProtoMsgV1 {
+		// PRW 1.0 flow has different proto message and no partial write handling.
 		var req prompb.WriteRequest
 		if err := proto.Unmarshal(decompressed, &req); err != nil {
 			// TODO(bwplotka): Add more context to responded error?
-			level.Error(h.logger).Log("msg", "Error decoding v1 remote write request", "protobuf_message", msg, "err", err.Error())
+			level.Error(h.logger).Log("msg", "Error decoding v1 remote write request", "protobuf_message", msgType, "err", err.Error())
 			http.Error(w, err.Error(), http.StatusBadRequest)
 			return
 		}
-		err = h.write(r.Context(), &req)
-	case config.RemoteWriteProtoMsgV2:
-		var req writev2.Request
-		if err := proto.Unmarshal(decompressed, &req); err != nil {
-			// TODO(bwplotka): Add more context to responded error?
-			level.Error(h.logger).Log("msg", "Error decoding v2 remote write request", "protobuf_message", msg, "err", err.Error())
-			http.Error(w, err.Error(), http.StatusBadRequest)
-			return
-		}
-		err = h.writeV2(r.Context(), &req)
-	}
-
+		if err = h.write(r.Context(), &req); err != nil {
 			switch {
-	case err == nil:
 			case errors.Is(err, storage.ErrOutOfOrderSample), errors.Is(err, storage.ErrOutOfBounds), errors.Is(err, storage.ErrDuplicateSampleForTimestamp), errors.Is(err, storage.ErrTooOldSample):
-		// Indicated an out of order sample is a bad request to prevent retries.
+				// Indicated an out-of-order sample is a bad request to prevent retries.
 				http.Error(w, err.Error(), http.StatusBadRequest)
 				return
 			default:
-		level.Error(h.logger).Log("msg", "Error appending remote write", "err", err.Error())
+				level.Error(h.logger).Log("msg", "Error while remote writing the v1 request", "err", err.Error())
 				http.Error(w, err.Error(), http.StatusInternalServerError)
 				return
 			}
-
+		}
 		w.WriteHeader(http.StatusNoContent)
-}
+		return
+	}
 
-// checkAppendExemplarError modifies the AppendExemplar's returned error based on the error cause.
-func (h *writeHandler) checkAppendExemplarError(err error, e exemplar.Exemplar, outOfOrderErrs *int) error {
-	unwrappedErr := errors.Unwrap(err)
-	if unwrappedErr == nil {
-		unwrappedErr = err
+	// Remote Write 2.x proto message handling.
+	var req writev2.Request
+	if err := proto.Unmarshal(decompressed, &req); err != nil {
+		// TODO(bwplotka): Add more context to responded error?
+		level.Error(h.logger).Log("msg", "Error decoding v2 remote write request", "protobuf_message", msgType, "err", err.Error())
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
 	}
-	switch {
-	case errors.Is(unwrappedErr, storage.ErrNotFound):
-		return storage.ErrNotFound
-	case errors.Is(unwrappedErr, storage.ErrOutOfOrderExemplar):
-		*outOfOrderErrs++
-		level.Debug(h.logger).Log("msg", "Out of order exemplar", "exemplar", fmt.Sprintf("%+v", e))
-		return nil
-	default:
-		return err
+
+	respStats, errHTTPCode, err := h.writeV2(r.Context(), &req)
+
+	// Set required X-Prometheus-Remote-Write-Written-* response headers, in all cases.
+	respStats.SetHeaders(w)
+
+	if err != nil {
+		if errHTTPCode/5 == 100 { // 5xx
+			level.Error(h.logger).Log("msg", "Error while remote writing the v2 request", "err", err.Error())
 		}
+		http.Error(w, err.Error(), errHTTPCode)
+		return
+	}
+	w.WriteHeader(http.StatusNoContent)
 }
 
 func (h *writeHandler) write(ctx context.Context, req *prompb.WriteRequest) (err error) {
 	outOfOrderExemplarErrs := 0
 	samplesWithInvalidLabels := 0
+	samplesAppended := 0
 
-	timeLimitApp := &timeLimitAppender{
+	app := &timeLimitAppender{
 		Appender: h.appendable.Appender(ctx),
 		maxTime:  timestamp.FromTime(time.Now().Add(maxAheadTime)),
 	}
 
 	defer func() {
 		if err != nil {
-			_ = timeLimitApp.Rollback()
+			_ = app.Rollback()
 			return
 		}
-		err = timeLimitApp.Commit()
+		err = app.Commit()
+		if err != nil {
+			h.samplesAppendedWithoutMetadata.Add(float64(samplesAppended))
+		}
 	}()
 
 	b := labels.NewScratchBuilder(0)
 	for _, ts := range req.Timeseries {
 		ls := ts.ToLabels(&b, nil)
-		if !ls.IsValid() {
+		if !ls.Has(labels.MetricName) || !ls.IsValid() {
 			level.Warn(h.logger).Log("msg", "Invalid metric names or labels", "got", ls.String())
 			samplesWithInvalidLabels++
+			// TODO(bwplotka): Even as per 1.0 spec, this should be a 400 error, while other samples are
+			// potentially written. Perhaps unify with fixed writeV2 implementation a bit.
 			continue
 		}
 
-		err := h.appendSamples(timeLimitApp, ts.Samples, ls)
-		if err != nil {
+		if err := h.appendV1Samples(app, ts.Samples, ls); err != nil {
 			return err
 		}
+		samplesAppended += len(ts.Samples)
 
 		for _, ep := range ts.Exemplars {
 			e := ep.ToExemplar(&b, nil)
-			h.appendExemplar(timeLimitApp, e, ls, &outOfOrderExemplarErrs)
+			if _, err := app.AppendExemplar(0, ls, e); err != nil {
+				switch {
+				case errors.Is(err, storage.ErrOutOfOrderExemplar):
+					outOfOrderExemplarErrs++
+					level.Debug(h.logger).Log("msg", "Out of order exemplar", "series", ls.String(), "exemplar", fmt.Sprintf("%+v", e))
+				default:
+					// Since exemplar storage is still experimental, we don't fail the request on ingestion errors
+					level.Debug(h.logger).Log("msg", "Error while adding exemplar in AppendExemplar", "series", ls.String(), "exemplar", fmt.Sprintf("%+v", e), "err", err)
+				}
+			}
 		}
 
-		err = h.appendHistograms(timeLimitApp, ts.Histograms, ls)
-		if err != nil {
+		if err = h.appendV1Histograms(app, ts.Histograms, ls); err != nil {
 			return err
 		}
+		samplesAppended += len(ts.Histograms)
 	}
 
 	if outOfOrderExemplarErrs > 0 {
@@ -256,156 +275,204 @@ func (h *writeHandler) write(ctx context.Context, req *prompb.WriteRequest) (err
 	if samplesWithInvalidLabels > 0 {
 		h.samplesWithInvalidLabelsTotal.Add(float64(samplesWithInvalidLabels))
 	}
-
 	return nil
 }
 
-func (h *writeHandler) writeV2(ctx context.Context, req *writev2.Request) (err error) {
-	outOfOrderExemplarErrs := 0
+func (h *writeHandler) appendV1Samples(app storage.Appender, ss []prompb.Sample, labels labels.Labels) error {
+	var ref storage.SeriesRef
+	var err error
+	for _, s := range ss {
+		ref, err = app.Append(ref, labels, s.GetTimestamp(), s.GetValue())
+		if err != nil {
+			if errors.Is(err, storage.ErrOutOfOrderSample) ||
+				errors.Is(err, storage.ErrOutOfBounds) ||
+				errors.Is(err, storage.ErrDuplicateSampleForTimestamp) {
+				level.Error(h.logger).Log("msg", "Out of order sample from remote write", "err", err.Error(), "series", labels.String(), "timestamp", s.Timestamp)
+			}
+			return err
+		}
+	}
+	return nil
+}
 
-	timeLimitApp := &timeLimitAppender{
+func (h *writeHandler) appendV1Histograms(app storage.Appender, hh []prompb.Histogram, labels labels.Labels) error {
+	var err error
+	for _, hp := range hh {
+		if hp.IsFloatHistogram() {
+			_, err = app.AppendHistogram(0, labels, hp.Timestamp, nil, hp.ToFloatHistogram())
+		} else {
+			_, err = app.AppendHistogram(0, labels, hp.Timestamp, hp.ToIntHistogram(), nil)
+		}
+		if err != nil {
+			// Although AppendHistogram does not currently return ErrDuplicateSampleForTimestamp there is
+			// a note indicating its inclusion in the future.
+			if errors.Is(err, storage.ErrOutOfOrderSample) ||
+				errors.Is(err, storage.ErrOutOfBounds) ||
+				errors.Is(err, storage.ErrDuplicateSampleForTimestamp) {
+				level.Error(h.logger).Log("msg", "Out of order histogram from remote write", "err", err.Error(), "series", labels.String(), "timestamp", hp.Timestamp)
+			}
+			return err
+		}
+	}
+	return nil
+}
+
+// writeV2 is similar to write, but it works with v2 proto message,
+// allows partial 4xx writes and gathers statistics.
+//
+// writeV2 returns the statistics.
+// In error cases, writeV2, also returns statistics, but also the error that
+// should be propagated to the remote write sender and httpCode to use for status.
+//
+// NOTE(bwplotka): TSDB storage is NOT idempotent, so we don't allow "partial retry-able" errors.
+// Once we have 5xx type of error, we immediately stop and rollback all appends.
+func (h *writeHandler) writeV2(ctx context.Context, req *writev2.Request) (_ WriteResponseStats, errHTTPCode int, _ error) {
+	app := &timeLimitAppender{
 		Appender: h.appendable.Appender(ctx),
 		maxTime:  timestamp.FromTime(time.Now().Add(maxAheadTime)),
 	}
 
-	defer func() {
+	s := WriteResponseStats{}
+	samplesWithoutMetadata, errHTTPCode, err := h.appendV2(app, req, &s)
 	if err != nil {
-			_ = timeLimitApp.Rollback()
-			return
+		if errHTTPCode/5 == 100 {
+			// On 5xx, we always rollback, because we expect
+			// sender to retry and TSDB is not idempotent.
+			if rerr := app.Rollback(); rerr != nil {
+				level.Error(h.logger).Log("msg", "writev2 rollback failed on retry-able error", "err", rerr)
+			}
+			return WriteResponseStats{}, errHTTPCode, err
 		}
-		err = timeLimitApp.Commit()
-	}()
 
-	b := labels.NewScratchBuilder(0)
+		// Non-retriable (e.g. bad request error case). Can be partially written.
+		commitErr := app.Commit()
+		if commitErr != nil {
+			// Bad requests does not matter as we have internal error (retryable).
+			return WriteResponseStats{}, http.StatusInternalServerError, commitErr
+		}
+		// Bad request error happened, but rest of data (if any) was written.
+		h.samplesAppendedWithoutMetadata.Add(float64(samplesWithoutMetadata))
+		return s, errHTTPCode, err
+	}
+
+	// All good just commit.
+	if err := app.Commit(); err != nil {
+		return WriteResponseStats{}, http.StatusInternalServerError, err
+	}
+	h.samplesAppendedWithoutMetadata.Add(float64(samplesWithoutMetadata))
+	return s, 0, nil
+}
+
+func (h *writeHandler) appendV2(app storage.Appender, req *writev2.Request, rs *WriteResponseStats) (samplesWithoutMetadata, errHTTPCode int, err error) {
+	var (
+		badRequestErrs                                   []error
+		outOfOrderExemplarErrs, samplesWithInvalidLabels int
+
+		b = labels.NewScratchBuilder(0)
+	)
 	for _, ts := range req.Timeseries {
 		ls := ts.ToLabels(&b, req.Symbols)
-
-		err := h.appendSamplesV2(timeLimitApp, ts.Samples, ls)
-		if err != nil {
-			return err
+		// Validate series labels early.
+		// NOTE(bwplotka): While spec allows UTF-8, Prometheus Receiver may impose
+		// specific limits and follow https://prometheus.io/docs/specs/remote_write_spec_2_0/#invalid-samples case.
+		if !ls.Has(labels.MetricName) || !ls.IsValid() {
+			badRequestErrs = append(badRequestErrs, fmt.Errorf("invalid metric name or labels, got %v", ls.String()))
+			samplesWithInvalidLabels += len(ts.Samples) + len(ts.Histograms)
+			continue
 		}
 
+		allSamplesSoFar := rs.AllSamples()
+		var ref storage.SeriesRef
+
+		// Samples.
+		for _, s := range ts.Samples {
+			ref, err = app.Append(ref, ls, s.GetTimestamp(), s.GetValue())
+			if err == nil {
+				rs.Samples++
+				continue
+			}
+			// Handle append error.
+			if errors.Is(err, storage.ErrOutOfOrderSample) ||
+				errors.Is(err, storage.ErrOutOfBounds) ||
+				errors.Is(err, storage.ErrDuplicateSampleForTimestamp) ||
+				errors.Is(err, storage.ErrTooOldSample) {
+				// TODO(bwplotka): Not too spammy log?
+				level.Error(h.logger).Log("msg", "Out of order sample from remote write", "err", err.Error(), "series", ls.String(), "timestamp", s.Timestamp)
+				badRequestErrs = append(badRequestErrs, fmt.Errorf("%w for series %v", err, ls.String()))
+				continue
+			}
+			return 0, http.StatusInternalServerError, err
+		}
+
+		// Native Histograms.
+		for _, hp := range ts.Histograms {
+			if hp.IsFloatHistogram() {
+				ref, err = app.AppendHistogram(ref, ls, hp.Timestamp, nil, hp.ToFloatHistogram())
+			} else {
+				ref, err = app.AppendHistogram(ref, ls, hp.Timestamp, hp.ToIntHistogram(), nil)
+			}
+			if err == nil {
+				rs.Histograms++
+				continue
+			}
+			// Handle append error.
+			// Although AppendHistogram does not currently return ErrDuplicateSampleForTimestamp there is
+			// a note indicating its inclusion in the future.
+			if errors.Is(err, storage.ErrOutOfOrderSample) ||
+				errors.Is(err, storage.ErrOutOfBounds) ||
+				errors.Is(err, storage.ErrDuplicateSampleForTimestamp) {
+				// TODO(bwplotka): Not too spammy log?
+				level.Error(h.logger).Log("msg", "Out of order histogram from remote write", "err", err.Error(), "series", ls.String(), "timestamp", hp.Timestamp)
+				badRequestErrs = append(badRequestErrs, fmt.Errorf("%w for series %v", err, ls.String()))
+				continue
+			}
+			return 0, http.StatusInternalServerError, err
+		}
+
+		// Exemplars.
 		for _, ep := range ts.Exemplars {
 			e := ep.ToExemplar(&b, req.Symbols)
-			h.appendExemplar(timeLimitApp, e, ls, &outOfOrderExemplarErrs)
+			ref, err = app.AppendExemplar(ref, ls, e)
+			if err == nil {
+				rs.Exemplars++
+				continue
 			}
-
-		err = h.appendHistogramsV2(timeLimitApp, ts.Histograms, ls)
-		if err != nil {
-			return err
+			// Handle append error.
+			if errors.Is(err, storage.ErrOutOfOrderExemplar) {
+				outOfOrderExemplarErrs++ // Maintain old metrics, but technically not needed, given we fail here.
+				level.Error(h.logger).Log("msg", "Out of order exemplar", "err", err.Error(), "series", ls.String(), "exemplar", fmt.Sprintf("%+v", e))
+				badRequestErrs = append(badRequestErrs, fmt.Errorf("%w for series %v", err, ls.String()))
+				continue
+			}
+			// TODO(bwplotka): Add strict mode which would trigger rollback of everything if needed.
+			// For now we keep the previously released flow (just error not debug leve) of dropping them without rollback and 5xx.
+			level.Error(h.logger).Log("msg", "failed to ingest exemplar, emitting error log, but no error for PRW caller", "err", err.Error(), "series", ls.String(), "exemplar", fmt.Sprintf("%+v", e))
 		}
 
 		m := ts.ToMetadata(req.Symbols)
-		if _, err = timeLimitApp.UpdateMetadata(0, ls, m); err != nil {
+		if _, err = app.UpdateMetadata(ref, ls, m); err != nil {
 			level.Debug(h.logger).Log("msg", "error while updating metadata from remote write", "err", err)
+			// Metadata is attached to each series, so since Prometheus does not reject sample without metadata information,
+			// we don't report remote write error either. We increment metric instead.
+			samplesWithoutMetadata += rs.AllSamples() - allSamplesSoFar
 		}
 	}
 
 	if outOfOrderExemplarErrs > 0 {
-		_ = level.Warn(h.logger).Log("msg", "Error on ingesting out-of-order exemplars", "num_dropped", outOfOrderExemplarErrs)
+		level.Warn(h.logger).Log("msg", "Error on ingesting out-of-order exemplars", "num_dropped", outOfOrderExemplarErrs)
 	}
+	h.samplesWithInvalidLabelsTotal.Add(float64(samplesWithInvalidLabels))
 
-	return nil
-}
-
-func (h *writeHandler) appendExemplar(app storage.Appender, e exemplar.Exemplar, labels labels.Labels, outOfOrderExemplarErrs *int) {
-	_, err := app.AppendExemplar(0, labels, e)
-	err = h.checkAppendExemplarError(err, e, outOfOrderExemplarErrs)
-	if err != nil {
-		// Since exemplar storage is still experimental, we don't fail the request on ingestion errors
-		level.Debug(h.logger).Log("msg", "Error while adding exemplar in AddExemplar", "exemplar", fmt.Sprintf("%+v", e), "err", err)
+	if len(badRequestErrs) == 0 {
+		return samplesWithoutMetadata, 0, nil
 	}
-}
-
-func (h *writeHandler) appendSamples(app storage.Appender, ss []prompb.Sample, labels labels.Labels) error {
-	var ref storage.SeriesRef
-	var err error
-	for _, s := range ss {
-		ref, err = app.Append(ref, labels, s.GetTimestamp(), s.GetValue())
-		if err != nil {
-			unwrappedErr := errors.Unwrap(err)
-			if unwrappedErr == nil {
-				unwrappedErr = err
-			}
-			if errors.Is(err, storage.ErrOutOfOrderSample) || errors.Is(unwrappedErr, storage.ErrOutOfBounds) || errors.Is(unwrappedErr, storage.ErrDuplicateSampleForTimestamp) {
-				level.Error(h.logger).Log("msg", "Out of order sample from remote write", "err", err.Error(), "series", labels.String(), "timestamp", s.Timestamp)
-			}
-			return err
-		}
-	}
-	return nil
-}
-
-func (h *writeHandler) appendSamplesV2(app storage.Appender, ss []writev2.Sample, labels labels.Labels) error {
-	var ref storage.SeriesRef
-	var err error
-	for _, s := range ss {
-		ref, err = app.Append(ref, labels, s.GetTimestamp(), s.GetValue())
-		if err != nil {
-			unwrappedErr := errors.Unwrap(err)
-			if unwrappedErr == nil {
-				unwrappedErr = err
-			}
-			if errors.Is(err, storage.ErrOutOfOrderSample) || errors.Is(unwrappedErr, storage.ErrOutOfBounds) || errors.Is(unwrappedErr, storage.ErrDuplicateSampleForTimestamp) {
-				level.Error(h.logger).Log("msg", "Out of order sample from remote write", "err", err.Error(), "series", labels.String(), "timestamp", s.Timestamp)
-			}
-			return err
-		}
-	}
-	return nil
-}
-
-func (h *writeHandler) appendHistograms(app storage.Appender, hh []prompb.Histogram, labels labels.Labels) error {
-	var err error
-	for _, hp := range hh {
-		if hp.IsFloatHistogram() {
-			_, err = app.AppendHistogram(0, labels, hp.Timestamp, nil, hp.ToFloatHistogram())
-		} else {
-			_, err = app.AppendHistogram(0, labels, hp.Timestamp, hp.ToIntHistogram(), nil)
-		}
-		if err != nil {
-			unwrappedErr := errors.Unwrap(err)
-			if unwrappedErr == nil {
-				unwrappedErr = err
-			}
-			// Although AppendHistogram does not currently return ErrDuplicateSampleForTimestamp there is
-			// a note indicating its inclusion in the future.
-			if errors.Is(unwrappedErr, storage.ErrOutOfOrderSample) || errors.Is(unwrappedErr, storage.ErrOutOfBounds) || errors.Is(unwrappedErr, storage.ErrDuplicateSampleForTimestamp) {
-				level.Error(h.logger).Log("msg", "Out of order histogram from remote write", "err", err.Error(), "series", labels.String(), "timestamp", hp.Timestamp)
-			}
-			return err
-		}
-	}
-	return nil
-}
-
-func (h *writeHandler) appendHistogramsV2(app storage.Appender, hh []writev2.Histogram, labels labels.Labels) error {
-	var err error
-	for _, hp := range hh {
-		if hp.IsFloatHistogram() {
-			_, err = app.AppendHistogram(0, labels, hp.Timestamp, nil, hp.ToFloatHistogram())
-		} else {
-			_, err = app.AppendHistogram(0, labels, hp.Timestamp, hp.ToIntHistogram(), nil)
-		}
-		if err != nil {
-			unwrappedErr := errors.Unwrap(err)
-			if unwrappedErr == nil {
-				unwrappedErr = err
-			}
-			// Although AppendHistogram does not currently return ErrDuplicateSampleForTimestamp there is
-			// a note indicating its inclusion in the future.
-			if errors.Is(unwrappedErr, storage.ErrOutOfOrderSample) || errors.Is(unwrappedErr, storage.ErrOutOfBounds) || errors.Is(unwrappedErr, storage.ErrDuplicateSampleForTimestamp) {
-				level.Error(h.logger).Log("msg", "Out of order histogram from remote write", "err", err.Error(), "series", labels.String(), "timestamp", hp.Timestamp)
-			}
-			return err
-		}
-	}
-	return nil
+	// TODO(bwplotka): Better concat formatting? Perhaps add size limit?
+	return samplesWithoutMetadata, http.StatusBadRequest, errors.Join(badRequestErrs...)
 }
 
 // NewOTLPWriteHandler creates a http.Handler that accepts OTLP write requests and
 // writes them to the provided appendable.
-func NewOTLPWriteHandler(logger log.Logger, appendable storage.Appendable) http.Handler {
+func NewOTLPWriteHandler(logger log.Logger, appendable storage.Appendable, configFunc func() config.Config) http.Handler {
 	rwHandler := &writeHandler{
 		logger:     logger,
 		appendable: appendable,
@@ -414,12 +481,14 @@ func NewOTLPWriteHandler(logger log.Logger, appendable storage.Appendable) http.
 	return &otlpWriteHandler{
 		logger:     logger,
 		rwHandler:  rwHandler,
+		configFunc: configFunc,
 	}
 }
 
 type otlpWriteHandler struct {
 	logger     log.Logger
 	rwHandler  *writeHandler
+	configFunc func() config.Config
 }
 
 func (h *otlpWriteHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -430,9 +499,12 @@ func (h *otlpWriteHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	otlpCfg := h.configFunc().OTLPConfig
+
 	converter := otlptranslator.NewPrometheusConverter()
 	if err := converter.FromMetrics(req.Metrics(), otlptranslator.Settings{
 		AddMetricSuffixes:         true,
+		PromoteResourceAttributes: otlpCfg.PromoteResourceAttributes,
 	}); err != nil {
 		level.Warn(h.logger).Log("msg", "Error translating OTLP metrics to Prometheus write request", "err", err)
 	}

storage/remote/write_handler_test.go

@@ -16,6 +16,7 @@ package remote
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"math"
@@ -27,6 +28,7 @@ import (
 	"time"
 
 	"github.com/go-kit/log"
+	"github.com/gogo/protobuf/proto"
 	"github.com/google/go-cmp/cmp"
 	"github.com/stretchr/testify/require"
 
@@ -290,8 +292,134 @@ func TestRemoteWriteHandler_V1Message(t *testing.T) {
 	}
 }
 
+func expectHeaderValue(t testing.TB, expected int, got string) {
+	t.Helper()
+
+	require.NotEmpty(t, got)
+	i, err := strconv.Atoi(got)
+	require.NoError(t, err)
+	require.Equal(t, expected, i)
+}
+
 func TestRemoteWriteHandler_V2Message(t *testing.T) {
-	payload, _, _, err := buildV2WriteRequest(log.NewNopLogger(), writeV2RequestFixture.Timeseries, writeV2RequestFixture.Symbols, nil, nil, nil, "snappy")
+	// V2 supports partial writes for non-retriable errors, so test them.
+	for _, tc := range []struct {
+		desc             string
+		input            []writev2.TimeSeries
+		expectedCode     int
+		expectedRespBody string
+
+		commitErr          error
+		appendSampleErr    error
+		appendHistogramErr error
+		appendExemplarErr  error
+		updateMetadataErr  error
+	}{
+		{
+			desc:         "All timeseries accepted",
+			input:        writeV2RequestFixture.Timeseries,
+			expectedCode: http.StatusNoContent,
+		},
+		{
+			desc: "Partial write; first series with invalid labels (no metric name)",
+			input: append(
+				// Series with test_metric1="test_metric1" labels.
+				[]writev2.TimeSeries{{LabelsRefs: []uint32{2, 2}, Samples: []writev2.Sample{{Value: 1, Timestamp: 1}}}},
+				writeV2RequestFixture.Timeseries...),
+			expectedCode:     http.StatusBadRequest,
+			expectedRespBody: "invalid metric name or labels, got {test_metric1=\"test_metric1\"}\n",
+		},
+		{
+			desc: "Partial write; first series with invalid labels (empty metric name)",
+			input: append(
+				// Series with __name__="" labels.
+				[]writev2.TimeSeries{{LabelsRefs: []uint32{1, 0}, Samples: []writev2.Sample{{Value: 1, Timestamp: 1}}}},
+				writeV2RequestFixture.Timeseries...),
+			expectedCode:     http.StatusBadRequest,
+			expectedRespBody: "invalid metric name or labels, got {__name__=\"\"}\n",
+		},
+		{
+			desc: "Partial write; first series with one OOO sample",
+			input: func() []writev2.TimeSeries {
+				f := proto.Clone(writeV2RequestFixture).(*writev2.Request)
+				f.Timeseries[0].Samples = append(f.Timeseries[0].Samples, writev2.Sample{Value: 2, Timestamp: 0})
+				return f.Timeseries
+			}(),
+			expectedCode:     http.StatusBadRequest,
+			expectedRespBody: "out of order sample for series {__name__=\"test_metric1\", b=\"c\", baz=\"qux\", d=\"e\", foo=\"bar\"}\n",
+		},
+		{
+			desc: "Partial write; first series with one dup sample",
+			input: func() []writev2.TimeSeries {
+				f := proto.Clone(writeV2RequestFixture).(*writev2.Request)
+				f.Timeseries[0].Samples = append(f.Timeseries[0].Samples, f.Timeseries[0].Samples[0])
+				return f.Timeseries
+			}(),
+			expectedCode:     http.StatusBadRequest,
+			expectedRespBody: "duplicate sample for timestamp for series {__name__=\"test_metric1\", b=\"c\", baz=\"qux\", d=\"e\", foo=\"bar\"}\n",
+		},
+		{
+			desc: "Partial write; first series with one OOO histogram sample",
+			input: func() []writev2.TimeSeries {
+				f := proto.Clone(writeV2RequestFixture).(*writev2.Request)
+				f.Timeseries[0].Histograms = append(f.Timeseries[0].Histograms, writev2.FromFloatHistogram(1, testHistogram.ToFloat(nil)))
+				return f.Timeseries
+			}(),
+			expectedCode:     http.StatusBadRequest,
+			expectedRespBody: "out of order sample for series {__name__=\"test_metric1\", b=\"c\", baz=\"qux\", d=\"e\", foo=\"bar\"}\n",
+		},
+		{
+			desc: "Partial write; first series with one dup histogram sample",
+			input: func() []writev2.TimeSeries {
+				f := proto.Clone(writeV2RequestFixture).(*writev2.Request)
+				f.Timeseries[0].Histograms = append(f.Timeseries[0].Histograms, f.Timeseries[0].Histograms[1])
+				return f.Timeseries
+			}(),
+			expectedCode:     http.StatusBadRequest,
+			expectedRespBody: "duplicate sample for timestamp for series {__name__=\"test_metric1\", b=\"c\", baz=\"qux\", d=\"e\", foo=\"bar\"}\n",
+		},
+		// Non retriable errors from various parts.
+		{
+			desc:            "Internal sample append error; rollback triggered",
+			input:           writeV2RequestFixture.Timeseries,
+			appendSampleErr: errors.New("some sample internal append error"),
+
+			expectedCode:     http.StatusInternalServerError,
+			expectedRespBody: "some sample internal append error\n",
+		},
+		{
+			desc:               "Internal histogram sample append error; rollback triggered",
+			input:              writeV2RequestFixture.Timeseries,
+			appendHistogramErr: errors.New("some histogram sample internal append error"),
+
+			expectedCode:     http.StatusInternalServerError,
+			expectedRespBody: "some histogram sample internal append error\n",
+		},
+		{
+			desc:              "Partial write; skipped exemplar; exemplar storage errs are noop",
+			input:             writeV2RequestFixture.Timeseries,
+			appendExemplarErr: errors.New("some exemplar internal append error"),
+
+			expectedCode: http.StatusNoContent,
+		},
+		{
+			desc:              "Partial write; skipped metadata; metadata storage errs are noop",
+			input:             writeV2RequestFixture.Timeseries,
+			updateMetadataErr: errors.New("some metadata update error"),
+
+			expectedCode: http.StatusNoContent,
+		},
+		{
+			desc:      "Internal commit error; rollback triggered",
+			input:     writeV2RequestFixture.Timeseries,
+			commitErr: errors.New("storage error"),
+
+			expectedCode:     http.StatusInternalServerError,
+			expectedRespBody: "storage error\n",
+		},
+	} {
+		t.Run(tc.desc, func(t *testing.T) {
+			payload, _, _, err := buildV2WriteRequest(log.NewNopLogger(), tc.input, writeV2RequestFixture.Symbols, nil, nil, nil, "snappy")
 			require.NoError(t, err)
 
 			req, err := http.NewRequest("", "", bytes.NewReader(payload))
@@ -301,40 +429,59 @@ func TestRemoteWriteHandler_V2Message(t *testing.T) {
 			req.Header.Set("Content-Encoding", string(SnappyBlockCompression))
 			req.Header.Set(RemoteWriteVersionHeader, RemoteWriteVersion20HeaderValue)
 
-	appendable := &mockAppendable{}
+			appendable := &mockAppendable{
+				commitErr:          tc.commitErr,
+				appendSampleErr:    tc.appendSampleErr,
+				appendHistogramErr: tc.appendHistogramErr,
+				appendExemplarErr:  tc.appendExemplarErr,
+				updateMetadataErr:  tc.updateMetadataErr,
+			}
 			handler := NewWriteHandler(log.NewNopLogger(), nil, appendable, []config.RemoteWriteProtoMsg{config.RemoteWriteProtoMsgV2})
 
 			recorder := httptest.NewRecorder()
 			handler.ServeHTTP(recorder, req)
 
 			resp := recorder.Result()
-	require.Equal(t, http.StatusNoContent, resp.StatusCode)
+			require.Equal(t, tc.expectedCode, resp.StatusCode)
+			respBody, err := io.ReadAll(resp.Body)
+			require.NoError(t, err)
+			require.Equal(t, tc.expectedRespBody, string(respBody))
 
-	b := labels.NewScratchBuilder(0)
-	i := 0
-	j := 0
-	k := 0
+			if tc.expectedCode == http.StatusInternalServerError {
+				// We don't expect writes for partial writes with retry-able code.
+				expectHeaderValue(t, 0, resp.Header.Get(rw20WrittenSamplesHeader))
+				expectHeaderValue(t, 0, resp.Header.Get(rw20WrittenHistogramsHeader))
+				expectHeaderValue(t, 0, resp.Header.Get(rw20WrittenExemplarsHeader))
+
+				require.Empty(t, len(appendable.samples))
+				require.Empty(t, len(appendable.histograms))
+				require.Empty(t, len(appendable.exemplars))
+				require.Empty(t, len(appendable.metadata))
+				return
+			}
+
+			// Double check mandatory 2.0 stats.
+			// writeV2RequestFixture has 2 series with 1 sample, 2 histograms, 1 exemplar each.
+			expectHeaderValue(t, 2, resp.Header.Get(rw20WrittenSamplesHeader))
+			expectHeaderValue(t, 4, resp.Header.Get(rw20WrittenHistogramsHeader))
+			if tc.appendExemplarErr != nil {
+				expectHeaderValue(t, 0, resp.Header.Get(rw20WrittenExemplarsHeader))
+			} else {
+				expectHeaderValue(t, 2, resp.Header.Get(rw20WrittenExemplarsHeader))
+			}
+
+			// Double check what was actually appended.
+			var (
+				b          = labels.NewScratchBuilder(0)
+				i, j, k, m int
+			)
 			for _, ts := range writeV2RequestFixture.Timeseries {
 				ls := ts.ToLabels(&b, writeV2RequestFixture.Symbols)
 
 				for _, s := range ts.Samples {
 					requireEqual(t, mockSample{ls, s.Timestamp, s.Value}, appendable.samples[i])
-
-			switch i {
-			case 0:
-				requireEqual(t, mockMetadata{ls, writeV2RequestSeries1Metadata}, appendable.metadata[i])
-			case 1:
-				requireEqual(t, mockMetadata{ls, writeV2RequestSeries2Metadata}, appendable.metadata[i])
-			default:
-				t.Fatal("more series/samples then expected")
-			}
 					i++
 				}
-		for _, e := range ts.Exemplars {
-			exemplarLabels := e.ToExemplar(&b, writeV2RequestFixture.Symbols).Labels
-			requireEqual(t, mockExemplar{ls, exemplarLabels, e.Timestamp, e.Value}, appendable.exemplars[j])
-			j++
-		}
 				for _, hp := range ts.Histograms {
 					if hp.IsFloatHistogram() {
 						fh := hp.ToFloatHistogram()
@@ -345,9 +492,24 @@ func TestRemoteWriteHandler_V2Message(t *testing.T) {
 					}
 					k++
 				}
+				if tc.appendExemplarErr == nil {
+					for _, e := range ts.Exemplars {
+						exemplarLabels := e.ToExemplar(&b, writeV2RequestFixture.Symbols).Labels
+						requireEqual(t, mockExemplar{ls, exemplarLabels, e.Timestamp, e.Value}, appendable.exemplars[j])
+						j++
+					}
+				}
+				if tc.updateMetadataErr == nil {
+					expectedMeta := ts.ToMetadata(writeV2RequestFixture.Symbols)
+					requireEqual(t, mockMetadata{ls, expectedMeta}, appendable.metadata[m])
+					m++
+				}
+			}
+		})
 	}
 }
 
+// NOTE: V2 Message is tested in TestRemoteWriteHandler_V2Message.
 func TestOutOfOrderSample_V1Message(t *testing.T) {
 	for _, tc := range []struct {
 		Name      string
@@ -372,7 +534,7 @@ func TestOutOfOrderSample_V1Message(t *testing.T) {
 			req, err := http.NewRequest("", "", bytes.NewReader(payload))
 			require.NoError(t, err)
 
-			appendable := &mockAppendable{latestSample: 100}
+			appendable := &mockAppendable{latestSample: map[uint64]int64{labels.FromStrings("__name__", "test_metric").Hash(): 100}}
 			handler := NewWriteHandler(log.NewNopLogger(), nil, appendable, []config.RemoteWriteProtoMsg{config.RemoteWriteProtoMsgV1})
 
 			recorder := httptest.NewRecorder()
@@ -384,49 +546,10 @@ func TestOutOfOrderSample_V1Message(t *testing.T) {
 	}
 }
 
-func TestOutOfOrderSample_V2Message(t *testing.T) {
-	for _, tc := range []struct {
-		Name      string
-		Timestamp int64
-	}{
-		{
-			Name:      "historic",
-			Timestamp: 0,
-		},
-		{
-			Name:      "future",
-			Timestamp: math.MaxInt64,
-		},
-	} {
-		t.Run(tc.Name, func(t *testing.T) {
-			payload, _, _, err := buildV2WriteRequest(nil, []writev2.TimeSeries{{
-				LabelsRefs: []uint32{1, 2},
-				Samples:    []writev2.Sample{{Value: 1, Timestamp: tc.Timestamp}},
-			}}, []string{"", "__name__", "metric1"}, nil, nil, nil, "snappy")
-			require.NoError(t, err)
-
-			req, err := http.NewRequest("", "", bytes.NewReader(payload))
-			require.NoError(t, err)
-
-			req.Header.Set("Content-Type", remoteWriteContentTypeHeaders[config.RemoteWriteProtoMsgV2])
-			req.Header.Set("Content-Encoding", string(SnappyBlockCompression))
-			req.Header.Set(RemoteWriteVersionHeader, RemoteWriteVersion20HeaderValue)
-
-			appendable := &mockAppendable{latestSample: 100}
-			handler := NewWriteHandler(log.NewNopLogger(), nil, appendable, []config.RemoteWriteProtoMsg{config.RemoteWriteProtoMsgV2})
-
-			recorder := httptest.NewRecorder()
-			handler.ServeHTTP(recorder, req)
-
-			resp := recorder.Result()
-			require.Equal(t, http.StatusBadRequest, resp.StatusCode)
-		})
-	}
-}
-
 // This test case currently aims to verify that the WriteHandler endpoint
 // don't fail on exemplar ingestion errors since the exemplar storage is
 // still experimental.
+// NOTE: V2 Message is tested in TestRemoteWriteHandler_V2Message.
 func TestOutOfOrderExemplar_V1Message(t *testing.T) {
 	tests := []struct {
 		Name      string
@@ -453,7 +576,7 @@ func TestOutOfOrderExemplar_V1Message(t *testing.T) {
 			req, err := http.NewRequest("", "", bytes.NewReader(payload))
 			require.NoError(t, err)
 
-			appendable := &mockAppendable{latestExemplar: 100}
+			appendable := &mockAppendable{latestSample: map[uint64]int64{labels.FromStrings("__name__", "test_metric").Hash(): 100}}
 			handler := NewWriteHandler(log.NewNopLogger(), nil, appendable, []config.RemoteWriteProtoMsg{config.RemoteWriteProtoMsgV1})
 
 			recorder := httptest.NewRecorder()
@@ -466,49 +589,7 @@ func TestOutOfOrderExemplar_V1Message(t *testing.T) {
 	}
 }
 
-func TestOutOfOrderExemplar_V2Message(t *testing.T) {
-	tests := []struct {
-		Name      string
-		Timestamp int64
-	}{
-		{
-			Name:      "historic",
-			Timestamp: 0,
-		},
-		{
-			Name:      "future",
-			Timestamp: math.MaxInt64,
-		},
-	}
-
-	for _, tc := range tests {
-		t.Run(tc.Name, func(t *testing.T) {
-			payload, _, _, err := buildV2WriteRequest(nil, []writev2.TimeSeries{{
-				LabelsRefs: []uint32{1, 2},
-				Exemplars:  []writev2.Exemplar{{LabelsRefs: []uint32{3, 4}, Value: 1, Timestamp: tc.Timestamp}},
-			}}, []string{"", "__name__", "metric1", "foo", "bar"}, nil, nil, nil, "snappy")
-			require.NoError(t, err)
-
-			req, err := http.NewRequest("", "", bytes.NewReader(payload))
-			require.NoError(t, err)
-
-			req.Header.Set("Content-Type", remoteWriteContentTypeHeaders[config.RemoteWriteProtoMsgV2])
-			req.Header.Set("Content-Encoding", string(SnappyBlockCompression))
-			req.Header.Set(RemoteWriteVersionHeader, RemoteWriteVersion20HeaderValue)
-
-			appendable := &mockAppendable{latestExemplar: 100}
-			handler := NewWriteHandler(log.NewNopLogger(), nil, appendable, []config.RemoteWriteProtoMsg{config.RemoteWriteProtoMsgV2})
-
-			recorder := httptest.NewRecorder()
-			handler.ServeHTTP(recorder, req)
-
-			resp := recorder.Result()
-			// TODO: update to require.Equal(t, http.StatusConflict, resp.StatusCode) once exemplar storage is not experimental.
-			require.Equal(t, http.StatusNoContent, resp.StatusCode)
-		})
-	}
-}
-
+// NOTE: V2 Message is tested in TestRemoteWriteHandler_V2Message.
 func TestOutOfOrderHistogram_V1Message(t *testing.T) {
 	for _, tc := range []struct {
 		Name      string
@@ -533,7 +614,7 @@ func TestOutOfOrderHistogram_V1Message(t *testing.T) {
 			req, err := http.NewRequest("", "", bytes.NewReader(payload))
 			require.NoError(t, err)
 
-			appendable := &mockAppendable{latestHistogram: 100}
+			appendable := &mockAppendable{latestSample: map[uint64]int64{labels.FromStrings("__name__", "test_metric").Hash(): 100}}
 			handler := NewWriteHandler(log.NewNopLogger(), nil, appendable, []config.RemoteWriteProtoMsg{config.RemoteWriteProtoMsgV1})
 
 			recorder := httptest.NewRecorder()
@@ -545,46 +626,6 @@ func TestOutOfOrderHistogram_V1Message(t *testing.T) {
 	}
 }
 
-func TestOutOfOrderHistogram_V2Message(t *testing.T) {
-	for _, tc := range []struct {
-		Name      string
-		Timestamp int64
-	}{
-		{
-			Name:      "historic",
-			Timestamp: 0,
-		},
-		{
-			Name:      "future",
-			Timestamp: math.MaxInt64,
-		},
-	} {
-		t.Run(tc.Name, func(t *testing.T) {
-			payload, _, _, err := buildV2WriteRequest(nil, []writev2.TimeSeries{{
-				LabelsRefs: []uint32{0, 1},
-				Histograms: []writev2.Histogram{writev2.FromIntHistogram(0, &testHistogram), writev2.FromFloatHistogram(1, testHistogram.ToFloat(nil))},
-			}}, []string{"__name__", "metric1"}, nil, nil, nil, "snappy")
-			require.NoError(t, err)
-
-			req, err := http.NewRequest("", "", bytes.NewReader(payload))
-			require.NoError(t, err)
-
-			req.Header.Set("Content-Type", remoteWriteContentTypeHeaders[config.RemoteWriteProtoMsgV2])
-			req.Header.Set("Content-Encoding", string(SnappyBlockCompression))
-			req.Header.Set(RemoteWriteVersionHeader, RemoteWriteVersion20HeaderValue)
-
-			appendable := &mockAppendable{latestHistogram: 100}
-			handler := NewWriteHandler(log.NewNopLogger(), nil, appendable, []config.RemoteWriteProtoMsg{config.RemoteWriteProtoMsgV2})
-
-			recorder := httptest.NewRecorder()
-			handler.ServeHTTP(recorder, req)
-
-			resp := recorder.Result()
-			require.Equal(t, http.StatusBadRequest, resp.StatusCode)
-		})
-	}
-}
-
 func BenchmarkRemoteWriteHandler(b *testing.B) {
 	const labelValue = "abcdefg'hijlmn234!@#$%^&*()_+~`\"{}[],./<>?hello0123hiOlá你好Dzieńdobry9Zd8ra765v4stvuyte"
 	var reqs []*http.Request
@@ -719,15 +760,20 @@ func genSeriesWithSample(numSeries int, ts int64) []prompb.TimeSeries {
 }
 
 type mockAppendable struct {
-	latestSample    int64
+	latestSample    map[uint64]int64
 	samples         []mockSample
-	latestExemplar  int64
+	latestExemplar  map[uint64]int64
 	exemplars       []mockExemplar
-	latestHistogram int64
+	latestHistogram map[uint64]int64
 	histograms      []mockHistogram
 	metadata        []mockMetadata
 
+	// optional errors to inject.
 	commitErr          error
+	appendSampleErr    error
+	appendHistogramErr error
+	appendExemplarErr  error
+	updateMetadataErr  error
 }
 
 type mockSample struct {
@@ -765,48 +811,92 @@ func requireEqual(t *testing.T, expected, actual interface{}, msgAndArgs ...inte
 }
 
 func (m *mockAppendable) Appender(_ context.Context) storage.Appender {
+	if m.latestSample == nil {
+		m.latestSample = map[uint64]int64{}
+	}
+	if m.latestHistogram == nil {
+		m.latestHistogram = map[uint64]int64{}
+	}
+	if m.latestExemplar == nil {
+		m.latestExemplar = map[uint64]int64{}
+	}
 	return m
 }
 
 func (m *mockAppendable) Append(_ storage.SeriesRef, l labels.Labels, t int64, v float64) (storage.SeriesRef, error) {
-	if t < m.latestSample {
-		return 0, storage.ErrOutOfOrderSample
+	if m.appendSampleErr != nil {
+		return 0, m.appendSampleErr
 	}
 
-	m.latestSample = t
+	latestTs := m.latestSample[l.Hash()]
+	if t < latestTs {
+		return 0, storage.ErrOutOfOrderSample
+	}
+	if t == latestTs {
+		return 0, storage.ErrDuplicateSampleForTimestamp
+	}
+
+	m.latestSample[l.Hash()] = t
 	m.samples = append(m.samples, mockSample{l, t, v})
 	return 0, nil
 }
 
 func (m *mockAppendable) Commit() error {
+	if m.commitErr != nil {
+		_ = m.Rollback() // As per Commit method contract.
+	}
 	return m.commitErr
 }
 
-func (*mockAppendable) Rollback() error {
-	return fmt.Errorf("not implemented")
+func (m *mockAppendable) Rollback() error {
+	m.samples = m.samples[:0]
+	m.exemplars = m.exemplars[:0]
+	m.histograms = m.histograms[:0]
+	m.metadata = m.metadata[:0]
+	return nil
 }
 
 func (m *mockAppendable) AppendExemplar(_ storage.SeriesRef, l labels.Labels, e exemplar.Exemplar) (storage.SeriesRef, error) {
-	if e.Ts < m.latestExemplar {
-		return 0, storage.ErrOutOfOrderExemplar
+	if m.appendExemplarErr != nil {
+		return 0, m.appendExemplarErr
 	}
 
-	m.latestExemplar = e.Ts
+	latestTs := m.latestExemplar[l.Hash()]
+	if e.Ts < latestTs {
+		return 0, storage.ErrOutOfOrderExemplar
+	}
+	if e.Ts == latestTs {
+		return 0, storage.ErrDuplicateExemplar
+	}
+
+	m.latestExemplar[l.Hash()] = e.Ts
 	m.exemplars = append(m.exemplars, mockExemplar{l, e.Labels, e.Ts, e.Value})
 	return 0, nil
 }
 
 func (m *mockAppendable) AppendHistogram(_ storage.SeriesRef, l labels.Labels, t int64, h *histogram.Histogram, fh *histogram.FloatHistogram) (storage.SeriesRef, error) {
-	if t < m.latestHistogram {
-		return 0, storage.ErrOutOfOrderSample
+	if m.appendHistogramErr != nil {
+		return 0, m.appendHistogramErr
 	}
 
-	m.latestHistogram = t
+	latestTs := m.latestHistogram[l.Hash()]
+	if t < latestTs {
+		return 0, storage.ErrOutOfOrderSample
+	}
+	if t == latestTs {
+		return 0, storage.ErrDuplicateSampleForTimestamp
+	}
+
+	m.latestHistogram[l.Hash()] = t
 	m.histograms = append(m.histograms, mockHistogram{l, t, h, fh})
 	return 0, nil
 }
 
 func (m *mockAppendable) UpdateMetadata(_ storage.SeriesRef, l labels.Labels, mp metadata.Metadata) (storage.SeriesRef, error) {
+	if m.updateMetadataErr != nil {
+		return 0, m.updateMetadataErr
+	}
+
 	m.metadata = append(m.metadata, mockMetadata{l: l, m: mp})
 	return 0, nil
 }

storage/remote/write_test.go

@@ -369,7 +369,7 @@ func TestWriteStorageApplyConfig_PartialUpdate(t *testing.T) {
 }
 
 func TestOTLPWriteHandler(t *testing.T) {
-	exportRequest := generateOTLPWriteRequest(t)
+	exportRequest := generateOTLPWriteRequest()
 
 	buf, err := exportRequest.MarshalProto()
 	require.NoError(t, err)
@@ -379,7 +379,11 @@ func TestOTLPWriteHandler(t *testing.T) {
 	req.Header.Set("Content-Type", "application/x-protobuf")
 
 	appendable := &mockAppendable{}
-	handler := NewOTLPWriteHandler(nil, appendable)
+	handler := NewOTLPWriteHandler(nil, appendable, func() config.Config {
+		return config.Config{
+			OTLPConfig: config.DefaultOTLPConfig,
+		}
+	})
 
 	recorder := httptest.NewRecorder()
 	handler.ServeHTTP(recorder, req)
@@ -392,7 +396,7 @@ func TestOTLPWriteHandler(t *testing.T) {
 	require.Len(t, appendable.exemplars, 1)  // 1 (exemplar)
 }
 
-func generateOTLPWriteRequest(t *testing.T) pmetricotlp.ExportRequest {
+func generateOTLPWriteRequest() pmetricotlp.ExportRequest {
 	d := pmetric.NewMetrics()
 
 	// Generate One Counter, One Gauge, One Histogram, One Exponential-Histogram
@@ -422,6 +426,7 @@ func generateOTLPWriteRequest(t *testing.T) pmetricotlp.ExportRequest {
 	counterDataPoint.Attributes().PutStr("foo.bar", "baz")
 
 	counterExemplar := counterDataPoint.Exemplars().AppendEmpty()
+
 	counterExemplar.SetTimestamp(pcommon.NewTimestampFromTime(timestamp))
 	counterExemplar.SetDoubleValue(10.0)
 	counterExemplar.SetSpanID(pcommon.SpanID{0, 1, 2, 3, 4, 5, 6, 7})

storage/secondary.go

@@ -49,16 +49,16 @@ func newSecondaryQuerierFromChunk(cq ChunkQuerier) genericQuerier {
 	return &secondaryQuerier{genericQuerier: newGenericQuerierFromChunk(cq)}
 }
 
-func (s *secondaryQuerier) LabelValues(ctx context.Context, name string, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
-	vals, w, err := s.genericQuerier.LabelValues(ctx, name, matchers...)
+func (s *secondaryQuerier) LabelValues(ctx context.Context, name string, hints *LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+	vals, w, err := s.genericQuerier.LabelValues(ctx, name, hints, matchers...)
 	if err != nil {
 		return nil, w.Add(err), nil
 	}
 	return vals, w, nil
 }
 
-func (s *secondaryQuerier) LabelNames(ctx context.Context, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
-	names, w, err := s.genericQuerier.LabelNames(ctx, matchers...)
+func (s *secondaryQuerier) LabelNames(ctx context.Context, hints *LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+	names, w, err := s.genericQuerier.LabelNames(ctx, hints, matchers...)
 	if err != nil {
 		return nil, w.Add(err), nil
 	}

tracing/tracing.go

@@ -30,7 +30,7 @@ import (
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/sdk/resource"
 	tracesdk "go.opentelemetry.io/otel/sdk/trace"
-	semconv "go.opentelemetry.io/otel/semconv/v1.25.0"
+	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
 	"go.opentelemetry.io/otel/trace"
 	"go.opentelemetry.io/otel/trace/noop"
 	"google.golang.org/grpc/credentials"

tsdb/db_test.go

@@ -63,7 +63,10 @@ func TestMain(m *testing.M) {
 	flag.Parse()
 	defaultIsolationDisabled = !isolationEnabled
 
-	goleak.VerifyTestMain(m, goleak.IgnoreTopFunction("github.com/prometheus/prometheus/tsdb.(*SegmentWAL).cut.func1"), goleak.IgnoreTopFunction("github.com/prometheus/prometheus/tsdb.(*SegmentWAL).cut.func2"))
+	goleak.VerifyTestMain(m,
+		goleak.IgnoreTopFunction("github.com/prometheus/prometheus/tsdb.(*SegmentWAL).cut.func1"),
+		goleak.IgnoreTopFunction("github.com/prometheus/prometheus/tsdb.(*SegmentWAL).cut.func2"),
+		goleak.IgnoreTopFunction("go.opencensus.io/stats/view.(*worker).start"))
 }
 
 func openTestDB(t testing.TB, opts *Options, rngs []int64) (db *DB) {
@@ -1001,7 +1004,7 @@ func TestWALFlushedOnDBClose(t *testing.T) {
 	q, err := db.Querier(0, 1)
 	require.NoError(t, err)
 
-	values, ws, err := q.LabelValues(ctx, "labelname")
+	values, ws, err := q.LabelValues(ctx, "labelname", nil)
 	require.NoError(t, err)
 	require.Empty(t, ws)
 	require.Equal(t, []string{"labelvalue"}, values)
@@ -1976,7 +1979,7 @@ func TestQuerierWithBoundaryChunks(t *testing.T) {
 	defer q.Close()
 
 	// The requested interval covers 2 blocks, so the querier's label values for blockID should give us 2 values, one from each block.
-	b, ws, err := q.LabelValues(ctx, "blockID")
+	b, ws, err := q.LabelValues(ctx, "blockID", nil)
 	require.NoError(t, err)
 	var nilAnnotations annotations.Annotations
 	require.Equal(t, nilAnnotations, ws)
@@ -2288,7 +2291,7 @@ func TestDB_LabelNames(t *testing.T) {
 		q, err := db.Querier(math.MinInt64, math.MaxInt64)
 		require.NoError(t, err)
 		var ws annotations.Annotations
-		labelNames, ws, err = q.LabelNames(ctx)
+		labelNames, ws, err = q.LabelNames(ctx, nil)
 		require.NoError(t, err)
 		require.Empty(t, ws)
 		require.NoError(t, q.Close())

tsdb/head.go

@@ -178,6 +178,7 @@ type HeadOptions struct {
 	WALReplayConcurrency int
 
 	// EnableSharding enables ShardedPostings() support in the Head.
+	// EnableSharding is temporarily disabled during Init().
 	EnableSharding bool
 }
 
@@ -609,7 +610,7 @@ const cardinalityCacheExpirationTime = time.Duration(30) * time.Second
 // Init loads data from the write ahead log and prepares the head for writes.
 // It should be called before using an appender so that it
 // limits the ingested samples to the head min valid time.
-func (h *Head) Init(minValidTime int64) error {
+func (h *Head) Init(minValidTime int64) (err error) {
 	h.minValidTime.Store(minValidTime)
 	defer func() {
 		h.postings.EnsureOrder(h.opts.WALReplayConcurrency)
@@ -623,6 +624,24 @@ func (h *Head) Init(minValidTime int64) error {
 		}
 	}()
 
+	// If sharding is enabled, disable it while initializing, and calculate the shards later.
+	// We're going to use that field for other purposes during WAL replay,
+	// so we don't want to waste time on calculating the shard that we're going to lose anyway.
+	if h.opts.EnableSharding {
+		h.opts.EnableSharding = false
+		defer func() {
+			h.opts.EnableSharding = true
+			if err == nil {
+				// No locking is needed here as nobody should be writing while we're in Init.
+				for _, stripe := range h.series.series {
+					for _, s := range stripe {
+						s.shardHashOrMemoryMappedMaxTime = labels.StableHash(s.lset)
+					}
+				}
+			}
+		}()
+	}
+
 	level.Info(h.logger).Log("msg", "Replaying on-disk memory mappable chunks if any")
 	start := time.Now()
 
@@ -683,7 +702,6 @@ func (h *Head) Init(minValidTime int64) error {
 		mmappedChunks    map[chunks.HeadSeriesRef][]*mmappedChunk
 		oooMmappedChunks map[chunks.HeadSeriesRef][]*mmappedChunk
 		lastMmapRef      chunks.ChunkDiskMapperRef
-		err              error
 
 		mmapChunkReplayDuration time.Duration
 	)
@@ -2068,9 +2086,11 @@ type memSeries struct {
 	ref  chunks.HeadSeriesRef
 	meta *metadata.Metadata
 
-	// Series labels hash to use for sharding purposes. The value is always 0 when sharding has not
-	// been explicitly enabled in TSDB.
-	shardHash uint64
+	// Series labels hash to use for sharding purposes.
+	// The value is always 0 when sharding has not been explicitly enabled in TSDB.
+	// While the WAL replay the value stored here is the max time of any mmapped chunk,
+	// and the shard hash is re-calculated after WAL replay is complete.
+	shardHashOrMemoryMappedMaxTime uint64
 
 	// Everything after here should only be accessed with the lock held.
 	sync.Mutex
@@ -2095,10 +2115,9 @@ type memSeries struct {
 
 	ooo *memSeriesOOOFields
 
-	mmMaxTime int64 // Max time of any mmapped chunk, only used during WAL replay.
-
 	nextAt                           int64 // Timestamp at which to cut the next chunk.
 	histogramChunkHasComputedEndTime bool  // True if nextAt has been predicted for the current histograms chunk; false otherwise.
+	pendingCommit                    bool  // Whether there are samples waiting to be committed to this series.
 
 	// We keep the last value here (in addition to appending it to the chunk) so we can check for duplicates.
 	lastValue float64
@@ -2114,8 +2133,6 @@ type memSeries struct {
 
 	// txs is nil if isolation is disabled.
 	txs *txRing
-
-	pendingCommit bool // Whether there are samples waiting to be committed to this series.
 }
 
 // memSeriesOOOFields contains the fields required by memSeries
@@ -2131,7 +2148,7 @@ func newMemSeries(lset labels.Labels, id chunks.HeadSeriesRef, shardHash uint64,
 		lset:                           lset,
 		ref:                            id,
 		nextAt:                         math.MinInt64,
-		shardHash: shardHash,
+		shardHashOrMemoryMappedMaxTime: shardHash,
 	}
 	if !isolationDisabled {
 		s.txs = newTxRing(0)
@@ -2219,6 +2236,12 @@ func (s *memSeries) truncateChunksBefore(mint int64, minOOOMmapRef chunks.ChunkD
 	return removedInOrder + removedOOO
 }
 
+// shardHash returns the shard hash of the series, only available after WAL replay.
+func (s *memSeries) shardHash() uint64 { return s.shardHashOrMemoryMappedMaxTime }
+
+// mmMaxTime returns the max time of any mmapped chunk in the series, only available during WAL replay.
+func (s *memSeries) mmMaxTime() int64 { return int64(s.shardHashOrMemoryMappedMaxTime) }
+
 // cleanupAppendIDsBelow cleans up older appendIDs. Has to be called after
 // acquiring lock.
 func (s *memSeries) cleanupAppendIDsBelow(bound uint64) {

tsdb/head_append.go

@@ -848,10 +848,11 @@ func (a *headAppender) Commit() (err error) {
 
 		inOrderMint         int64 = math.MaxInt64
 		inOrderMaxt         int64 = math.MinInt64
-		ooomint         int64 = math.MaxInt64
-		ooomaxt         int64 = math.MinInt64
+		oooMinT             int64 = math.MaxInt64
+		oooMaxT             int64 = math.MinInt64
 		wblSamples          []record.RefSample
-		oooMmapMarkers  map[chunks.HeadSeriesRef]chunks.ChunkDiskMapperRef
+		oooMmapMarkers      map[chunks.HeadSeriesRef][]chunks.ChunkDiskMapperRef
+		oooMmapMarkersCount int
 		oooRecords          [][]byte
 		oooCapMax           = a.head.opts.OutOfOrderCapMax.Load()
 		series              *memSeries
@@ -872,6 +873,7 @@ func (a *headAppender) Commit() (err error) {
 			// WBL is not enabled. So no need to collect.
 			wblSamples = nil
 			oooMmapMarkers = nil
+			oooMmapMarkersCount = 0
 			return
 		}
 		// The m-map happens before adding a new sample. So we collect
@@ -880,13 +882,15 @@ func (a *headAppender) Commit() (err error) {
 		//   WBL Before this Commit(): [old samples before this commit for chunk 1]
 		//   WBL After this Commit():  [old samples before this commit for chunk 1][new samples in this commit for chunk 1]mmapmarker1[samples for chunk 2]mmapmarker2[samples for chunk 3]
 		if oooMmapMarkers != nil {
-			markers := make([]record.RefMmapMarker, 0, len(oooMmapMarkers))
-			for ref, mmapRef := range oooMmapMarkers {
+			markers := make([]record.RefMmapMarker, 0, oooMmapMarkersCount)
+			for ref, mmapRefs := range oooMmapMarkers {
+				for _, mmapRef := range mmapRefs {
 					markers = append(markers, record.RefMmapMarker{
 						Ref:     ref,
 						MmapRef: mmapRef,
 					})
 				}
+			}
 			r := enc.MmapMarkers(markers, a.head.getBytesBuffer())
 			oooRecords = append(oooRecords, r)
 		}
@@ -928,32 +932,39 @@ func (a *headAppender) Commit() (err error) {
 		case oooSample:
 			// Sample is OOO and OOO handling is enabled
 			// and the delta is within the OOO tolerance.
-			var mmapRef chunks.ChunkDiskMapperRef
-			ok, chunkCreated, mmapRef = series.insert(s.T, s.V, a.head.chunkDiskMapper, oooCapMax)
+			var mmapRefs []chunks.ChunkDiskMapperRef
+			ok, chunkCreated, mmapRefs = series.insert(s.T, s.V, a.head.chunkDiskMapper, oooCapMax)
 			if chunkCreated {
 				r, ok := oooMmapMarkers[series.ref]
-				if !ok || r != 0 {
+				if !ok || r != nil {
 					// !ok means there are no markers collected for these samples yet. So we first flush the samples
 					// before setting this m-map marker.
 
-					// r != 0 means we have already m-mapped a chunk for this series in the same Commit().
+					// r != nil means we have already m-mapped a chunk for this series in the same Commit().
 					// Hence, before we m-map again, we should add the samples and m-map markers
 					// seen till now to the WBL records.
 					collectOOORecords()
 				}
 
 				if oooMmapMarkers == nil {
-					oooMmapMarkers = make(map[chunks.HeadSeriesRef]chunks.ChunkDiskMapperRef)
+					oooMmapMarkers = make(map[chunks.HeadSeriesRef][]chunks.ChunkDiskMapperRef)
+				}
+				if len(mmapRefs) > 0 {
+					oooMmapMarkers[series.ref] = mmapRefs
+					oooMmapMarkersCount += len(mmapRefs)
+				} else {
+					// No chunk was written to disk, so we need to set an initial marker for this series.
+					oooMmapMarkers[series.ref] = []chunks.ChunkDiskMapperRef{0}
+					oooMmapMarkersCount++
 				}
-				oooMmapMarkers[series.ref] = mmapRef
 			}
 			if ok {
 				wblSamples = append(wblSamples, s)
-				if s.T < ooomint {
-					ooomint = s.T
+				if s.T < oooMinT {
+					oooMinT = s.T
 				}
-				if s.T > ooomaxt {
-					ooomaxt = s.T
+				if s.T > oooMaxT {
+					oooMaxT = s.T
 				}
 				floatOOOAccepted++
 			} else {
@@ -1053,7 +1064,7 @@ func (a *headAppender) Commit() (err error) {
 	a.head.metrics.samplesAppended.WithLabelValues(sampleMetricTypeHistogram).Add(float64(histogramsAppended))
 	a.head.metrics.outOfOrderSamplesAppended.WithLabelValues(sampleMetricTypeFloat).Add(float64(floatOOOAccepted))
 	a.head.updateMinMaxTime(inOrderMint, inOrderMaxt)
-	a.head.updateMinOOOMaxOOOTime(ooomint, ooomaxt)
+	a.head.updateMinOOOMaxOOOTime(oooMinT, oooMaxT)
 
 	collectOOORecords()
 	if a.head.wbl != nil {
@@ -1069,14 +1080,14 @@ func (a *headAppender) Commit() (err error) {
 }
 
 // insert is like append, except it inserts. Used for OOO samples.
-func (s *memSeries) insert(t int64, v float64, chunkDiskMapper *chunks.ChunkDiskMapper, oooCapMax int64) (inserted, chunkCreated bool, mmapRef chunks.ChunkDiskMapperRef) {
+func (s *memSeries) insert(t int64, v float64, chunkDiskMapper *chunks.ChunkDiskMapper, oooCapMax int64) (inserted, chunkCreated bool, mmapRefs []chunks.ChunkDiskMapperRef) {
 	if s.ooo == nil {
 		s.ooo = &memSeriesOOOFields{}
 	}
 	c := s.ooo.oooHeadChunk
 	if c == nil || c.chunk.NumSamples() == int(oooCapMax) {
 		// Note: If no new samples come in then we rely on compaction to clean up stale in-memory OOO chunks.
-		c, mmapRef = s.cutNewOOOHeadChunk(t, chunkDiskMapper)
+		c, mmapRefs = s.cutNewOOOHeadChunk(t, chunkDiskMapper)
 		chunkCreated = true
 	}
 
@@ -1089,7 +1100,7 @@ func (s *memSeries) insert(t int64, v float64, chunkDiskMapper *chunks.ChunkDisk
 			c.maxTime = t
 		}
 	}
-	return ok, chunkCreated, mmapRef
+	return ok, chunkCreated, mmapRefs
 }
 
 // chunkOpts are chunk-level options that are passed when appending to a memSeries.
@@ -1431,7 +1442,7 @@ func (s *memSeries) cutNewHeadChunk(mint int64, e chunkenc.Encoding, chunkRange
 
 // cutNewOOOHeadChunk cuts a new OOO chunk and m-maps the old chunk.
 // The caller must ensure that s.ooo is not nil.
-func (s *memSeries) cutNewOOOHeadChunk(mint int64, chunkDiskMapper *chunks.ChunkDiskMapper) (*oooHeadChunk, chunks.ChunkDiskMapperRef) {
+func (s *memSeries) cutNewOOOHeadChunk(mint int64, chunkDiskMapper *chunks.ChunkDiskMapper) (*oooHeadChunk, []chunks.ChunkDiskMapperRef) {
 	ref := s.mmapCurrentOOOHeadChunk(chunkDiskMapper)
 
 	s.ooo.oooHeadChunk = &oooHeadChunk{
@@ -1443,21 +1454,29 @@ func (s *memSeries) cutNewOOOHeadChunk(mint int64, chunkDiskMapper *chunks.Chunk
 	return s.ooo.oooHeadChunk, ref
 }
 
-func (s *memSeries) mmapCurrentOOOHeadChunk(chunkDiskMapper *chunks.ChunkDiskMapper) chunks.ChunkDiskMapperRef {
+func (s *memSeries) mmapCurrentOOOHeadChunk(chunkDiskMapper *chunks.ChunkDiskMapper) []chunks.ChunkDiskMapperRef {
 	if s.ooo == nil || s.ooo.oooHeadChunk == nil {
-		// There is no head chunk, so nothing to m-map here.
-		return 0
+		// OOO is not enabled or there is no head chunk, so nothing to m-map here.
+		return nil
 	}
-	xor, _ := s.ooo.oooHeadChunk.chunk.ToXOR() // Encode to XorChunk which is more compact and implements all of the needed functionality.
-	chunkRef := chunkDiskMapper.WriteChunk(s.ref, s.ooo.oooHeadChunk.minTime, s.ooo.oooHeadChunk.maxTime, xor, true, handleChunkWriteError)
+	chks, err := s.ooo.oooHeadChunk.chunk.ToEncodedChunks(math.MinInt64, math.MaxInt64)
+	if err != nil {
+		handleChunkWriteError(err)
+		return nil
+	}
+	chunkRefs := make([]chunks.ChunkDiskMapperRef, 0, 1)
+	for _, memchunk := range chks {
+		chunkRef := chunkDiskMapper.WriteChunk(s.ref, s.ooo.oooHeadChunk.minTime, s.ooo.oooHeadChunk.maxTime, memchunk.chunk, true, handleChunkWriteError)
+		chunkRefs = append(chunkRefs, chunkRef)
 		s.ooo.oooMmappedChunks = append(s.ooo.oooMmappedChunks, &mmappedChunk{
 			ref:        chunkRef,
-		numSamples: uint16(xor.NumSamples()),
-		minTime:    s.ooo.oooHeadChunk.minTime,
-		maxTime:    s.ooo.oooHeadChunk.maxTime,
+			numSamples: uint16(memchunk.chunk.NumSamples()),
+			minTime:    memchunk.minTime,
+			maxTime:    memchunk.maxTime,
 		})
+	}
 	s.ooo.oooHeadChunk = nil
-	return chunkRef
+	return chunkRefs
 }
 
 // mmapChunks will m-map all but first chunk on s.headChunks list.

tsdb/head_read.go

@@ -170,7 +170,7 @@ func (h *headIndexReader) ShardedPostings(p index.Postings, shardIndex, shardCou
 		}
 
 		// Check if the series belong to the shard.
-		if s.shardHash%shardCount != shardIndex {
+		if s.shardHash()%shardCount != shardIndex {
 			continue
 		}
 

tsdb/head_test.go

@@ -23,6 +23,7 @@ import (
 	"path"
 	"path/filepath"
 	"reflect"
+	"runtime/pprof"
 	"sort"
 	"strconv"
 	"strings"
@@ -89,6 +90,43 @@ func newTestHeadWithOptions(t testing.TB, compressWAL wlog.CompressionType, opts
 	return h, wal
 }
 
+// BenchmarkLoadRealWLs will be skipped unless the BENCHMARK_LOAD_REAL_WLS_DIR environment variable is set.
+// BENCHMARK_LOAD_REAL_WLS_DIR should be the folder where `wal` and `chunks_head` are located.
+// Optionally, BENCHMARK_LOAD_REAL_WLS_PROFILE can be set to a file path to write a CPU profile.
+func BenchmarkLoadRealWLs(b *testing.B) {
+	dir := os.Getenv("BENCHMARK_LOAD_REAL_WLS_DIR")
+	if dir == "" {
+		b.Skipped()
+	}
+
+	profileFile := os.Getenv("BENCHMARK_LOAD_REAL_WLS_PROFILE")
+	if profileFile != "" {
+		b.Logf("Will profile in %s", profileFile)
+		f, err := os.Create(profileFile)
+		require.NoError(b, err)
+		b.Cleanup(func() { f.Close() })
+		require.NoError(b, pprof.StartCPUProfile(f))
+		b.Cleanup(pprof.StopCPUProfile)
+	}
+
+	wal, err := wlog.New(nil, nil, filepath.Join(dir, "wal"), wlog.CompressionNone)
+	require.NoError(b, err)
+	b.Cleanup(func() { wal.Close() })
+
+	wbl, err := wlog.New(nil, nil, filepath.Join(dir, "wbl"), wlog.CompressionNone)
+	require.NoError(b, err)
+	b.Cleanup(func() { wbl.Close() })
+
+	// Load the WAL.
+	for i := 0; i < b.N; i++ {
+		opts := DefaultHeadOptions()
+		opts.ChunkDirRoot = dir
+		h, err := NewHead(nil, nil, wal, wbl, opts, nil)
+		require.NoError(b, err)
+		h.Init(0)
+	}
+}
+
 func BenchmarkCreateSeries(b *testing.B) {
 	series := genSeries(b.N, 10, 0, 0)
 	h, _ := newTestHead(b, 10000, wlog.CompressionNone, false)
@@ -4730,6 +4768,14 @@ func TestChunkSnapshotTakenAfterIncompleteSnapshot(t *testing.T) {
 
 // TestWBLReplay checks the replay at a low level.
 func TestWBLReplay(t *testing.T) {
+	for name, scenario := range sampleTypeScenarios {
+		t.Run(name, func(t *testing.T) {
+			testWBLReplay(t, scenario)
+		})
+	}
+}
+
+func testWBLReplay(t *testing.T, scenario sampleTypeScenario) {
 	dir := t.TempDir()
 	wal, err := wlog.NewSize(nil, nil, filepath.Join(dir, "wal"), 32768, wlog.CompressionSnappy)
 	require.NoError(t, err)
@@ -4745,11 +4791,11 @@ func TestWBLReplay(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, h.Init(0))
 
-	var expOOOSamples []sample
+	var expOOOSamples []chunks.Sample
 	l := labels.FromStrings("foo", "bar")
-	appendSample := func(mins int64, isOOO bool) {
+	appendSample := func(mins int64, val float64, isOOO bool) {
 		app := h.Appender(context.Background())
-		ts, v := mins*time.Minute.Milliseconds(), float64(mins)
+		ts, v := mins*time.Minute.Milliseconds(), val
 		_, err := app.Append(0, l, ts, v)
 		require.NoError(t, err)
 		require.NoError(t, app.Commit())
@@ -4760,15 +4806,15 @@ func TestWBLReplay(t *testing.T) {
 	}
 
 	// In-order sample.
-	appendSample(60, false)
+	appendSample(60, 60, false)
 
 	// Out of order samples.
-	appendSample(40, true)
-	appendSample(35, true)
-	appendSample(50, true)
-	appendSample(55, true)
-	appendSample(59, true)
-	appendSample(31, true)
+	appendSample(40, 40, true)
+	appendSample(35, 35, true)
+	appendSample(50, 50, true)
+	appendSample(55, 55, true)
+	appendSample(59, 59, true)
+	appendSample(31, 31, true)
 
 	// Check that Head's time ranges are set properly.
 	require.Equal(t, 60*time.Minute.Milliseconds(), h.MinTime())
@@ -4792,22 +4838,23 @@ func TestWBLReplay(t *testing.T) {
 	require.False(t, ok)
 	require.NotNil(t, ms)
 
-	xor, err := ms.ooo.oooHeadChunk.chunk.ToXOR()
+	chks, err := ms.ooo.oooHeadChunk.chunk.ToEncodedChunks(math.MinInt64, math.MaxInt64)
 	require.NoError(t, err)
+	require.Len(t, chks, 1)
 
-	it := xor.Iterator(nil)
-	actOOOSamples := make([]sample, 0, len(expOOOSamples))
-	for it.Next() == chunkenc.ValFloat {
-		ts, v := it.At()
-		actOOOSamples = append(actOOOSamples, sample{t: ts, f: v})
-	}
+	it := chks[0].chunk.Iterator(nil)
+	actOOOSamples, err := storage.ExpandSamples(it, nil)
+	require.NoError(t, err)
 
 	// OOO chunk will be sorted. Hence sort the expected samples.
 	sort.Slice(expOOOSamples, func(i, j int) bool {
-		return expOOOSamples[i].t < expOOOSamples[j].t
+		return expOOOSamples[i].T() < expOOOSamples[j].T()
 	})
 
-	require.Equal(t, expOOOSamples, actOOOSamples)
+	// Passing in true for the 'ignoreCounterResets' parameter prevents differences in counter reset headers
+	// from being factored in to the sample comparison
+	// TODO(fionaliao): understand counter reset behaviour, might want to modify this later
+	requireEqualSamples(t, l.String(), expOOOSamples, actOOOSamples, true)
 
 	require.NoError(t, h.Close())
 }

tsdb/head_wal.go

@@ -435,6 +435,8 @@ Outer:
 	return nil
 }
 
+func minInt64() int64 { return math.MinInt64 }
+
 // resetSeriesWithMMappedChunks is only used during the WAL replay.
 func (h *Head) resetSeriesWithMMappedChunks(mSeries *memSeries, mmc, oooMmc []*mmappedChunk, walSeriesRef chunks.HeadSeriesRef) (overlapped bool) {
 	if mSeries.ref != walSeriesRef {
@@ -481,10 +483,11 @@ func (h *Head) resetSeriesWithMMappedChunks(mSeries *memSeries, mmc, oooMmc []*m
 	}
 	// Cache the last mmapped chunk time, so we can skip calling append() for samples it will reject.
 	if len(mmc) == 0 {
-		mSeries.mmMaxTime = math.MinInt64
+		mSeries.shardHashOrMemoryMappedMaxTime = uint64(minInt64())
 	} else {
-		mSeries.mmMaxTime = mmc[len(mmc)-1].maxTime
-		h.updateMinMaxTime(mmc[0].minTime, mSeries.mmMaxTime)
+		mmMaxTime := mmc[len(mmc)-1].maxTime
+		mSeries.shardHashOrMemoryMappedMaxTime = uint64(mmMaxTime)
+		h.updateMinMaxTime(mmc[0].minTime, mmMaxTime)
 	}
 	if len(oooMmc) != 0 {
 		// Mint and maxt can be in any chunk, they are not sorted.
@@ -585,7 +588,7 @@ func (wp *walSubsetProcessor) processWALSamples(h *Head, mmappedChunks, oooMmapp
 				unknownRefs++
 				continue
 			}
-			if s.T <= ms.mmMaxTime {
+			if s.T <= ms.mmMaxTime() {
 				continue
 			}
 			if _, chunkCreated := ms.append(s.T, s.V, 0, appendChunkOpts); chunkCreated {
@@ -614,7 +617,7 @@ func (wp *walSubsetProcessor) processWALSamples(h *Head, mmappedChunks, oooMmapp
 				unknownHistogramRefs++
 				continue
 			}
-			if s.t <= ms.mmMaxTime {
+			if s.t <= ms.mmMaxTime() {
 				continue
 			}
 			var chunkCreated bool

tsdb/ooo_head.go

@@ -17,9 +17,10 @@ import (
 	"fmt"
 	"sort"
 
+	"github.com/prometheus/prometheus/tsdb/chunkenc"
+
 	"github.com/oklog/ulid"
 
-	"github.com/prometheus/prometheus/tsdb/chunkenc"
 	"github.com/prometheus/prometheus/tsdb/chunks"
 	"github.com/prometheus/prometheus/tsdb/tombstones"
 )
@@ -74,24 +75,22 @@ func (o *OOOChunk) NumSamples() int {
 	return len(o.samples)
 }
 
-func (o *OOOChunk) ToXOR() (*chunkenc.XORChunk, error) {
-	x := chunkenc.NewXORChunk()
-	app, err := x.Appender()
-	if err != nil {
-		return nil, err
-	}
-	for _, s := range o.samples {
-		app.Append(s.t, s.f)
-	}
-	return x, nil
-}
-
-func (o *OOOChunk) ToXORBetweenTimestamps(mint, maxt int64) (*chunkenc.XORChunk, error) {
-	x := chunkenc.NewXORChunk()
-	app, err := x.Appender()
-	if err != nil {
-		return nil, err
+// ToEncodedChunks returns chunks with the samples in the OOOChunk.
+//
+//nolint:revive // unexported-return.
+func (o *OOOChunk) ToEncodedChunks(mint, maxt int64) (chks []memChunk, err error) {
+	if len(o.samples) == 0 {
+		return nil, nil
 	}
+	// The most common case is that there will be a single chunk, with the same type of samples in it - this is always true for float samples.
+	chks = make([]memChunk, 0, 1)
+	var (
+		cmint int64
+		cmaxt int64
+		chunk chunkenc.Chunk
+		app   chunkenc.Appender
+	)
+	prevEncoding := chunkenc.EncNone // Yes we could call the chunk for this, but this is more efficient.
 	for _, s := range o.samples {
 		if s.t < mint {
 			continue
@@ -99,9 +98,77 @@ func (o *OOOChunk) ToXORBetweenTimestamps(mint, maxt int64) (*chunkenc.XORChunk,
 		if s.t > maxt {
 			break
 		}
-		app.Append(s.t, s.f)
+		encoding := chunkenc.EncXOR
+		if s.h != nil {
+			encoding = chunkenc.EncHistogram
+		} else if s.fh != nil {
+			encoding = chunkenc.EncFloatHistogram
 		}
-	return x, nil
+
+		// prevApp is the appender for the previous sample.
+		prevApp := app
+
+		if encoding != prevEncoding { // For the first sample, this will always be true as EncNone != EncXOR | EncHistogram | EncFloatHistogram
+			if prevEncoding != chunkenc.EncNone {
+				chks = append(chks, memChunk{chunk, cmint, cmaxt, nil})
+			}
+			cmint = s.t
+			switch encoding {
+			case chunkenc.EncXOR:
+				chunk = chunkenc.NewXORChunk()
+			case chunkenc.EncHistogram:
+				chunk = chunkenc.NewHistogramChunk()
+			case chunkenc.EncFloatHistogram:
+				chunk = chunkenc.NewFloatHistogramChunk()
+			default:
+				chunk = chunkenc.NewXORChunk()
+			}
+			app, err = chunk.Appender()
+			if err != nil {
+				return
+			}
+		}
+		switch encoding {
+		case chunkenc.EncXOR:
+			app.Append(s.t, s.f)
+		case chunkenc.EncHistogram:
+			// Ignoring ok is ok, since we don't want to compare to the wrong previous appender anyway.
+			prevHApp, _ := prevApp.(*chunkenc.HistogramAppender)
+			var (
+				newChunk chunkenc.Chunk
+				recoded  bool
+			)
+			newChunk, recoded, app, _ = app.AppendHistogram(prevHApp, s.t, s.h, false)
+			if newChunk != nil { // A new chunk was allocated.
+				if !recoded {
+					chks = append(chks, memChunk{chunk, cmint, cmaxt, nil})
+				}
+				chunk = newChunk
+				cmint = s.t
+			}
+		case chunkenc.EncFloatHistogram:
+			// Ignoring ok is ok, since we don't want to compare to the wrong previous appender anyway.
+			prevHApp, _ := prevApp.(*chunkenc.FloatHistogramAppender)
+			var (
+				newChunk chunkenc.Chunk
+				recoded  bool
+			)
+			newChunk, recoded, app, _ = app.AppendFloatHistogram(prevHApp, s.t, s.fh, false)
+			if newChunk != nil { // A new chunk was allocated.
+				if !recoded {
+					chks = append(chks, memChunk{chunk, cmint, cmaxt, nil})
+				}
+				chunk = newChunk
+				cmint = s.t
+			}
+		}
+		cmaxt = s.t
+		prevEncoding = encoding
+	}
+	if prevEncoding != chunkenc.EncNone {
+		chks = append(chks, memChunk{chunk, cmint, cmaxt, nil})
+	}
+	return chks, nil
 }
 
 var _ BlockReader = &OOORangeHead{}

tsdb/ooo_head_read.go

@@ -108,11 +108,19 @@ func (oh *OOOHeadIndexReader) series(ref storage.SeriesRef, builder *labels.Scra
 		c := s.ooo.oooHeadChunk
 		if c.OverlapsClosedInterval(oh.mint, oh.maxt) && maxMmapRef == 0 {
 			ref := chunks.ChunkRef(chunks.NewHeadChunkRef(s.ref, s.oooHeadChunkID(len(s.ooo.oooMmappedChunks))))
-			var xor chunkenc.Chunk
 			if len(c.chunk.samples) > 0 { // Empty samples happens in tests, at least.
-				xor, _ = c.chunk.ToXOR() // Ignoring error because it can't fail.
+				chks, err := s.ooo.oooHeadChunk.chunk.ToEncodedChunks(c.minTime, c.maxTime)
+				if err != nil {
+					handleChunkWriteError(err)
+					return nil
+				}
+				for _, chk := range chks {
+					addChunk(c.minTime, c.maxTime, ref, chk.chunk)
+				}
+			} else {
+				var emptyChunk chunkenc.Chunk
+				addChunk(c.minTime, c.maxTime, ref, emptyChunk)
 			}
-			addChunk(c.minTime, c.maxTime, ref, xor)
 		}
 	}
 	for i := len(s.ooo.oooMmappedChunks) - 1; i >= 0; i-- {
@@ -341,14 +349,20 @@ func NewOOOCompactionHead(ctx context.Context, head *Head) (*OOOCompactionHead,
 			continue
 		}
 
-		mmapRef := ms.mmapCurrentOOOHeadChunk(head.chunkDiskMapper)
-		if mmapRef == 0 && len(ms.ooo.oooMmappedChunks) > 0 {
+		var lastMmapRef chunks.ChunkDiskMapperRef
+		mmapRefs := ms.mmapCurrentOOOHeadChunk(head.chunkDiskMapper)
+		if len(mmapRefs) == 0 && len(ms.ooo.oooMmappedChunks) > 0 {
 			// Nothing was m-mapped. So take the mmapRef from the existing slice if it exists.
-			mmapRef = ms.ooo.oooMmappedChunks[len(ms.ooo.oooMmappedChunks)-1].ref
+			mmapRefs = []chunks.ChunkDiskMapperRef{ms.ooo.oooMmappedChunks[len(ms.ooo.oooMmappedChunks)-1].ref}
 		}
-		seq, off := mmapRef.Unpack()
+		if len(mmapRefs) == 0 {
+			lastMmapRef = 0
+		} else {
+			lastMmapRef = mmapRefs[len(mmapRefs)-1]
+		}
+		seq, off := lastMmapRef.Unpack()
 		if seq > lastSeq || (seq == lastSeq && off > lastOff) {
-			ch.lastMmapRef, lastSeq, lastOff = mmapRef, seq, off
+			ch.lastMmapRef, lastSeq, lastOff = lastMmapRef, seq, off
 		}
 		if len(ms.ooo.oooMmappedChunks) > 0 {
 			ch.postings = append(ch.postings, seriesRef)

tsdb/querier.go

@@ -77,12 +77,12 @@ func newBlockBaseQuerier(b BlockReader, mint, maxt int64) (*blockBaseQuerier, er
 	}, nil
 }
 
-func (q *blockBaseQuerier) LabelValues(ctx context.Context, name string, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (q *blockBaseQuerier) LabelValues(ctx context.Context, name string, hints *storage.LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	res, err := q.index.SortedLabelValues(ctx, name, matchers...)
 	return res, nil, err
 }
 
-func (q *blockBaseQuerier) LabelNames(ctx context.Context, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
+func (q *blockBaseQuerier) LabelNames(ctx context.Context, hints *storage.LabelHints, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
 	res, err := q.index.LabelNames(ctx, matchers...)
 	return res, nil, err
 }

tsdb/querier_test.go

@@ -3022,7 +3022,7 @@ func TestQuerierIndexQueriesRace(t *testing.T) {
 				q, err := db.Querier(math.MinInt64, math.MaxInt64)
 				require.NoError(t, err)
 
-				values, _, err := q.LabelValues(ctx, "seq", c.matchers...)
+				values, _, err := q.LabelValues(ctx, "seq", nil, c.matchers...)
 				require.NoError(t, err)
 				require.Emptyf(t, values, `label values for label "seq" should be empty`)
 

tsdb/tsdbutil/histogram.go

@@ -30,12 +30,10 @@ func GenerateTestHistograms(n int) (r []*histogram.Histogram) {
 	return r
 }
 
-func GenerateTestHistogramsWithUnknownResetHint(n int) []*histogram.Histogram {
-	hs := GenerateTestHistograms(n)
-	for i := range hs {
-		hs[i].CounterResetHint = histogram.UnknownCounterReset
-	}
-	return hs
+func GenerateTestHistogramWithHint(n int, hint histogram.CounterResetHint) *histogram.Histogram {
+	h := GenerateTestHistogram(n)
+	h.CounterResetHint = hint
+	return h
 }
 
 // GenerateTestHistogram but it is up to the user to set any known counter reset hint.

tsdb/wlog/watcher.go

@@ -265,6 +265,11 @@ func (w *Watcher) loop() {
 // Run the watcher, which will tail the WAL until the quit channel is closed
 // or an error case is hit.
 func (w *Watcher) Run() error {
+	_, lastSegment, err := w.firstAndLast()
+	if err != nil {
+		return fmt.Errorf("wal.Segments: %w", err)
+	}
+
 	// We want to ensure this is false across iterations since
 	// Run will be called again if there was a failure to read the WAL.
 	w.sendSamples = false
@@ -289,20 +294,14 @@ func (w *Watcher) Run() error {
 		return err
 	}
 
-	level.Debug(w.logger).Log("msg", "Tailing WAL", "lastCheckpoint", lastCheckpoint, "checkpointIndex", checkpointIndex, "currentSegment", currentSegment)
+	level.Debug(w.logger).Log("msg", "Tailing WAL", "lastCheckpoint", lastCheckpoint, "checkpointIndex", checkpointIndex, "currentSegment", currentSegment, "lastSegment", lastSegment)
 	for !isClosed(w.quit) {
 		w.currentSegmentMetric.Set(float64(currentSegment))
 
-		// Re-check on each iteration in case a new segment was added,
-		// because watch() will wait for notifications on the last segment.
-		_, lastSegment, err := w.firstAndLast()
-		if err != nil {
-			return fmt.Errorf("wal.Segments: %w", err)
-		}
-		tail := currentSegment >= lastSegment
-
-		level.Debug(w.logger).Log("msg", "Processing segment", "currentSegment", currentSegment, "lastSegment", lastSegment)
-		if err := w.watch(currentSegment, tail); err != nil && !errors.Is(err, ErrIgnorable) {
+		// On start, after reading the existing WAL for series records, we have a pointer to what is the latest segment.
+		// On subsequent calls to this function, currentSegment will have been incremented and we should open that segment.
+		level.Debug(w.logger).Log("msg", "Processing segment", "currentSegment", currentSegment)
+		if err := w.watch(currentSegment, currentSegment >= lastSegment); err != nil && !errors.Is(err, ErrIgnorable) {
 			return err
 		}
 

tsdb/wlog/watcher_test.go

@@ -17,6 +17,7 @@ import (
 	"math/rand"
 	"os"
 	"path"
+	"runtime"
 	"sync"
 	"testing"
 	"time"
@@ -700,11 +701,46 @@ func TestRun_StartupTime(t *testing.T) {
 	}
 }
 
+func generateWALRecords(w *WL, segment, seriesCount, samplesCount int) error {
+	enc := record.Encoder{}
+	for j := 0; j < seriesCount; j++ {
+		ref := j + (segment * 100)
+		series := enc.Series([]record.RefSeries{
+			{
+				Ref:    chunks.HeadSeriesRef(ref),
+				Labels: labels.FromStrings("__name__", fmt.Sprintf("metric_%d", segment)),
+			},
+		}, nil)
+		if err := w.Log(series); err != nil {
+			return err
+		}
+
+		for k := 0; k < samplesCount; k++ {
+			inner := rand.Intn(ref + 1)
+			sample := enc.Samples([]record.RefSample{
+				{
+					Ref: chunks.HeadSeriesRef(inner),
+					T:   int64(segment),
+					V:   float64(segment),
+				},
+			}, nil)
+			if err := w.Log(sample); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
 func TestRun_AvoidNotifyWhenBehind(t *testing.T) {
-	const pageSize = 32 * 1024
-	const segments = 10
-	const seriesCount = 20
-	const samplesCount = 300
+	if runtime.GOOS == "windows" { // Takes a really long time, perhaps because min sleep time is 15ms.
+		t.SkipNow()
+	}
+	const segmentSize = pageSize // Smallest allowed segment size.
+	const segmentsToWrite = 5
+	const segmentsToRead = segmentsToWrite - 1
+	const seriesCount = 10
+	const samplesCount = 50
 
 	// This test can take longer than intended to finish in cloud CI.
 	readTimeout := 10 * time.Second
@@ -717,73 +753,37 @@ func TestRun_AvoidNotifyWhenBehind(t *testing.T) {
 			err := os.Mkdir(wdir, 0o777)
 			require.NoError(t, err)
 
-			enc := record.Encoder{}
-			w, err := NewSize(nil, nil, wdir, pageSize, compress)
+			w, err := NewSize(nil, nil, wdir, segmentSize, compress)
 			require.NoError(t, err)
 			var wg sync.WaitGroup
-			// add one segment initially to ensure there's a value > 0 for the last segment id
-			for i := 0; i < 1; i++ {
-				for j := 0; j < seriesCount; j++ {
-					ref := j + (i * 100)
-					series := enc.Series([]record.RefSeries{
-						{
-							Ref:    chunks.HeadSeriesRef(ref),
-							Labels: labels.FromStrings("__name__", fmt.Sprintf("metric_%d", i)),
-						},
-					}, nil)
-					require.NoError(t, w.Log(series))
-
-					for k := 0; k < samplesCount; k++ {
-						inner := rand.Intn(ref + 1)
-						sample := enc.Samples([]record.RefSample{
-							{
-								Ref: chunks.HeadSeriesRef(inner),
-								T:   int64(i),
-								V:   float64(i),
-							},
-						}, nil)
-						require.NoError(t, w.Log(sample))
-					}
-				}
-			}
+			// Generate one segment initially to ensure that watcher.Run() finds at least one segment on disk.
+			require.NoError(t, generateWALRecords(w, 0, seriesCount, samplesCount))
+			w.NextSegment() // Force creation of the next segment
 			wg.Add(1)
 			go func() {
 				defer wg.Done()
-				for i := 1; i < segments; i++ {
-					for j := 0; j < seriesCount; j++ {
-						ref := j + (i * 100)
-						series := enc.Series([]record.RefSeries{
-							{
-								Ref:    chunks.HeadSeriesRef(ref),
-								Labels: labels.FromStrings("__name__", fmt.Sprintf("metric_%d", i)),
-							},
-						}, nil)
-						require.NoError(t, w.Log(series))
-
-						for k := 0; k < samplesCount; k++ {
-							inner := rand.Intn(ref + 1)
-							sample := enc.Samples([]record.RefSample{
-								{
-									Ref: chunks.HeadSeriesRef(inner),
-									T:   int64(i),
-									V:   float64(i),
-								},
-							}, nil)
-							require.NoError(t, w.Log(sample))
-						}
-					}
+				for i := 1; i < segmentsToWrite; i++ {
+					require.NoError(t, generateWALRecords(w, i, seriesCount, samplesCount))
+					w.NextSegment()
 				}
 			}()
 
 			wt := newWriteToMock(time.Millisecond)
 			watcher := NewWatcher(wMetrics, nil, nil, "", wt, dir, false, false, false)
-			watcher.MaxSegment = segments
+			watcher.MaxSegment = segmentsToRead
 
 			watcher.setMetrics()
 			startTime := time.Now()
 			err = watcher.Run()
 			wg.Wait()
 			require.Less(t, time.Since(startTime), readTimeout)
+
+			// But samples records shouldn't get dropped
+			retry(t, defaultRetryInterval, defaultRetries, func() bool {
+				return wt.checkNumSeries() > 0
+			})
+			require.Equal(t, segmentsToRead*seriesCount*samplesCount, wt.samplesAppended)
+
 			require.NoError(t, err)
 			require.NoError(t, w.Close())
 		})