feat(nomad): add nomad service discovery

Signed-off-by: Bram Vogelaar <bram@attachmentgenie.com>

config/config_test.go

@@ -45,6 +45,7 @@ import (
 	"github.com/prometheus/prometheus/discovery/linode"
 	"github.com/prometheus/prometheus/discovery/marathon"
 	"github.com/prometheus/prometheus/discovery/moby"
+	"github.com/prometheus/prometheus/discovery/nomad"
 	"github.com/prometheus/prometheus/discovery/openstack"
 	"github.com/prometheus/prometheus/discovery/puppetdb"
 	"github.com/prometheus/prometheus/discovery/scaleway"
@@ -513,6 +514,32 @@ var expectedConf = &Config{
 				},
 			},
 		},
+		{
+			JobName: "service-nomad",
+
+			HonorTimestamps: true,
+			ScrapeInterval:  model.Duration(15 * time.Second),
+			ScrapeTimeout:   DefaultGlobalConfig.ScrapeTimeout,
+
+			MetricsPath:      DefaultScrapeConfig.MetricsPath,
+			Scheme:           DefaultScrapeConfig.Scheme,
+			HTTPClientConfig: config.DefaultHTTPClientConfig,
+
+			ServiceDiscoveryConfigs: discovery.Configs{
+				&nomad.SDConfig{
+					AllowStale:      true,
+					Namespace:       "default",
+					RefreshInterval: model.Duration(60 * time.Second),
+					Region:          "global",
+					Server:          "http://localhost:4646",
+					TagSeparator:    ",",
+					HTTPClientConfig: config.HTTPClientConfig{
+						FollowRedirects: true,
+						EnableHTTP2:     true,
+					},
+				},
+			},
+		},
 		{
 			JobName: "service-ec2",
 

config/testdata/conf.good.yml

@@ -214,6 +214,10 @@ scrape_configs:
           cert_file: valid_cert_file
           key_file: valid_key_file
 
+  - job_name: service-nomad
+    nomad_sd_configs:
+      - server: 'http://localhost:4646'
+
   - job_name: service-ec2
     ec2_sd_configs:
       - region: us-east-1

discovery/install/install.go

@@ -31,6 +31,7 @@ import (
 	_ "github.com/prometheus/prometheus/discovery/linode"       // register linode
 	_ "github.com/prometheus/prometheus/discovery/marathon"     // register marathon
 	_ "github.com/prometheus/prometheus/discovery/moby"         // register moby
+	_ "github.com/prometheus/prometheus/discovery/nomad"        // register nomad
 	_ "github.com/prometheus/prometheus/discovery/openstack"    // register openstack
 	_ "github.com/prometheus/prometheus/discovery/puppetdb"     // register puppetdb
 	_ "github.com/prometheus/prometheus/discovery/scaleway"     // register scaleway

discovery/nomad/nomad.go

@@ -0,0 +1,208 @@
+// Copyright 2022 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 nomad
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/go-kit/log"
+	nomad "github.com/hashicorp/nomad/api"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/config"
+	"github.com/prometheus/common/model"
+
+	"github.com/prometheus/prometheus/discovery"
+	"github.com/prometheus/prometheus/discovery/refresh"
+	"github.com/prometheus/prometheus/discovery/targetgroup"
+)
+
+const (
+	// nomadLabel is the name for the label containing a target.
+	nomadLabel = model.MetaLabelPrefix + "nomad_"
+	// serviceLabel is the name of the label containing the service name.
+	nomadAddress        = nomadLabel + "address"
+	nomadService        = nomadLabel + "service"
+	nomadNamespace      = nomadLabel + "namespace"
+	nomadNodeID         = nomadLabel + "node_id"
+	nomadDatacenter     = nomadLabel + "dc"
+	nomadServiceAddress = nomadService + "_address"
+	nomadServicePort    = nomadService + "_port"
+	nomadServiceID      = nomadService + "_id"
+	nomadTags           = nomadLabel + "tags"
+)
+
+// DefaultSDConfig is the default nomad SD configuration.
+var (
+	DefaultSDConfig = SDConfig{
+		AllowStale:       true,
+		HTTPClientConfig: config.DefaultHTTPClientConfig,
+		Namespace:        "default",
+		RefreshInterval:  model.Duration(60 * time.Second),
+		Region:           "global",
+		Server:           "http://localhost:4646",
+		TagSeparator:     ",",
+	}
+
+	failuresCount = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "prometheus_sd_nomad_failures_total",
+			Help: "Number of nomad service discovery refresh failures.",
+		})
+)
+
+func init() {
+	discovery.RegisterConfig(&SDConfig{})
+	prometheus.MustRegister(failuresCount)
+}
+
+// SDConfig is the configuration for nomad based service discovery.
+type SDConfig struct {
+	AllowStale       bool                    `yaml:"allow_stale"`
+	HTTPClientConfig config.HTTPClientConfig `yaml:",inline"`
+	Namespace        string                  `yaml:"namespace"`
+	RefreshInterval  model.Duration          `yaml:"refresh_interval"`
+	Region           string                  `yaml:"region"`
+	Server           string                  `yaml:"server"`
+	TagSeparator     string                  `yaml:"tag_separator,omitempty"`
+}
+
+// Name returns the name of the Config.
+func (*SDConfig) Name() string { return "nomad" }
+
+// NewDiscoverer returns a Discoverer for the Config.
+func (c *SDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
+	return NewDiscovery(c, opts.Logger)
+}
+
+// SetDirectory joins any relative file paths with dir.
+func (c *SDConfig) SetDirectory(dir string) {
+	c.HTTPClientConfig.SetDirectory(dir)
+}
+
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
+func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	*c = DefaultSDConfig
+	type plain SDConfig
+	err := unmarshal((*plain)(c))
+	if err != nil {
+		return err
+	}
+	if strings.TrimSpace(c.Server) == "" {
+		return errors.New("nomad SD configuration requires a server address")
+	}
+	return c.HTTPClientConfig.Validate()
+}
+
+// Discovery periodically performs nomad requests. It implements
+// the Discoverer interface.
+type Discovery struct {
+	*refresh.Discovery
+	allowStale      bool
+	client          *nomad.Client
+	namespace       string
+	refreshInterval time.Duration
+	region          string
+	server          string
+	tagSeparator    string
+}
+
+// NewDiscovery returns a new Discovery which periodically refreshes its targets.
+func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
+	d := &Discovery{
+		allowStale:      conf.AllowStale,
+		namespace:       conf.Namespace,
+		refreshInterval: time.Duration(conf.RefreshInterval),
+		region:          conf.Region,
+		server:          conf.Server,
+		tagSeparator:    conf.TagSeparator,
+	}
+
+	HTTPClient, err := config.NewClientFromConfig(conf.HTTPClientConfig, "nomad_sd")
+	if err != nil {
+		return nil, err
+	}
+
+	config := nomad.Config{
+		Address:    conf.Server,
+		HttpClient: HTTPClient,
+		Namespace:  conf.Namespace,
+		Region:     conf.Region,
+	}
+
+	client, err := nomad.NewClient(&config)
+	if err != nil {
+		return nil, err
+	}
+	d.client = client
+
+	d.Discovery = refresh.NewDiscovery(
+		logger,
+		"nomad",
+		time.Duration(conf.RefreshInterval),
+		d.refresh,
+	)
+	return d, nil
+}
+
+func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
+	opts := &nomad.QueryOptions{
+		AllowStale: d.allowStale,
+	}
+	stubs, _, err := d.client.Services().List(opts)
+	if err != nil {
+		return nil, err
+	}
+
+	tg := &targetgroup.Group{
+		Source: "Nomad",
+	}
+
+	for _, stub := range stubs {
+		for _, service := range stub.Services {
+			instances, _, err := d.client.Services().Get(service.ServiceName, opts)
+			if err != nil {
+				return nil, fmt.Errorf("failed to fetch services: %w", err)
+			}
+
+			for _, instance := range instances {
+				labels := model.LabelSet{
+					nomadAddress:        model.LabelValue(instance.Address),
+					nomadDatacenter:     model.LabelValue(instance.Datacenter),
+					nomadNodeID:         model.LabelValue(instance.NodeID),
+					nomadNamespace:      model.LabelValue(instance.Namespace),
+					nomadServiceAddress: model.LabelValue(instance.Address),
+					nomadServiceID:      model.LabelValue(instance.ID),
+					nomadServicePort:    model.LabelValue(strconv.Itoa(instance.Port)),
+					nomadService:        model.LabelValue(instance.ServiceName),
+				}
+				addr := net.JoinHostPort(instance.Address, strconv.FormatInt(int64(instance.Port), 10))
+				labels[model.AddressLabel] = model.LabelValue(addr)
+
+				if len(instance.Tags) > 0 {
+					tags := d.tagSeparator + strings.Join(instance.Tags, d.tagSeparator) + d.tagSeparator
+					labels[nomadTags] = model.LabelValue(tags)
+				}
+
+				tg.Targets = append(tg.Targets, labels)
+			}
+		}
+	}
+	return []*targetgroup.Group{tg}, nil
+}

discovery/nomad/nomad_test.go

@@ -0,0 +1,172 @@
+// Copyright 2015 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 nomad
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/common/model"
+	"github.com/stretchr/testify/require"
+)
+
+type NomadSDTestSuite struct {
+	Mock *SDMock
+}
+
+// SDMock is the interface for the nomad mock
+type SDMock struct {
+	t      *testing.T
+	Server *httptest.Server
+	Mux    *http.ServeMux
+}
+
+// NewSDMock returns a new SDMock.
+func NewSDMock(t *testing.T) *SDMock {
+	return &SDMock{
+		t: t,
+	}
+}
+
+// Endpoint returns the URI to the mock server
+func (m *SDMock) Endpoint() string {
+	return m.Server.URL + "/"
+}
+
+// Setup creates the mock server
+func (m *SDMock) Setup() {
+	m.Mux = http.NewServeMux()
+	m.Server = httptest.NewServer(m.Mux)
+}
+
+// ShutdownServer creates the mock server
+func (m *SDMock) ShutdownServer() {
+	m.Server.Close()
+}
+
+func (s *NomadSDTestSuite) TearDownSuite() {
+	s.Mock.ShutdownServer()
+}
+
+func (s *NomadSDTestSuite) SetupTest(t *testing.T) {
+	s.Mock = NewSDMock(t)
+	s.Mock.Setup()
+
+	s.Mock.HandleServicesList()
+	s.Mock.HandleServiceHashiCupsGet()
+}
+
+func (m *SDMock) HandleServicesList() {
+	m.Mux.HandleFunc("/v1/services", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("content-type", "application/json; charset=utf-8")
+		w.WriteHeader(http.StatusOK)
+
+		fmt.Fprint(w, `
+		[
+			{
+				"Namespace": "default",
+				"Services": [
+				{
+					"ServiceName": "hashicups",
+					"Tags": [
+					"metrics"
+					]
+				}
+				]
+			}
+		]`,
+		)
+	})
+}
+
+func (m *SDMock) HandleServiceHashiCupsGet() {
+	m.Mux.HandleFunc("/v1/service/hashicups", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("content-type", "application/json; charset=utf-8")
+		w.WriteHeader(http.StatusOK)
+
+		fmt.Fprint(w, `
+		[
+			{
+				"ID": "_nomad-task-6a1d5f0a-7362-3f5d-9baf-5ed438918e50-group-hashicups-hashicups-hashicups_ui",
+				"ServiceName": "hashicups",
+				"Namespace": "default",
+				"NodeID": "d92fdc3c-9c2b-298a-e8f4-c33f3a449f09",
+				"Datacenter": "dc1",
+				"JobID": "dashboard",
+				"AllocID": "6a1d5f0a-7362-3f5d-9baf-5ed438918e50",
+				"Tags": [
+				"metrics"
+				],
+				"Address": "127.0.0.1",
+				"Port": 30456,
+				"CreateIndex": 226,
+				"ModifyIndex": 226
+			}
+		]`,
+		)
+	})
+}
+
+func TestConfiguredService(t *testing.T) {
+	conf := &SDConfig{
+		Server: "http://localhost:4646",
+	}
+	_, err := NewDiscovery(conf, nil)
+	if err != nil {
+		t.Errorf("Unexpected error when initializing discovery %v", err)
+	}
+}
+
+func TestNomadSDRefresh(t *testing.T) {
+	sdmock := &NomadSDTestSuite{}
+	sdmock.SetupTest(t)
+	t.Cleanup(sdmock.TearDownSuite)
+
+	endpoint, err := url.Parse(sdmock.Mock.Endpoint())
+	require.NoError(t, err)
+
+	cfg := DefaultSDConfig
+	cfg.Server = endpoint.String()
+	d, err := NewDiscovery(&cfg, log.NewNopLogger())
+	require.NoError(t, err)
+
+	tgs, err := d.refresh(context.Background())
+	require.NoError(t, err)
+
+	require.Equal(t, 1, len(tgs))
+
+	tg := tgs[0]
+	require.NotNil(t, tg)
+	require.NotNil(t, tg.Targets)
+	require.Equal(t, 1, len(tg.Targets))
+
+	lbls := model.LabelSet{
+		"__address__":                  model.LabelValue("127.0.0.1:30456"),
+		"__meta_nomad_address":         model.LabelValue("127.0.0.1"),
+		"__meta_nomad_dc":              model.LabelValue("dc1"),
+		"__meta_nomad_namespace":       model.LabelValue("default"),
+		"__meta_nomad_node_id":         model.LabelValue("d92fdc3c-9c2b-298a-e8f4-c33f3a449f09"),
+		"__meta_nomad_service":         model.LabelValue("hashicups"),
+		"__meta_nomad_service_address": model.LabelValue("127.0.0.1"),
+		"__meta_nomad_service_id":      model.LabelValue("_nomad-task-6a1d5f0a-7362-3f5d-9baf-5ed438918e50-group-hashicups-hashicups-hashicups_ui"),
+		"__meta_nomad_service_port":    model.LabelValue("30456"),
+		"__meta_nomad_tags":            model.LabelValue(",metrics,"),
+	}
+	require.Equal(t, lbls, tg.Targets[0])
+}

docs/configuration/configuration.md

@@ -285,6 +285,10 @@ marathon_sd_configs:
 nerve_sd_configs:
   [ - <nerve_sd_config> ... ]
 
+# List of Nomad service discovery configurations.
+nomad_sd_configs:
+  [ - <nomad_sd_config> ... ]
+
 # List of OpenStack service discovery configurations.
 openstack_sd_configs:
   [ - <openstack_sd_config> ... ]
@@ -2174,6 +2178,73 @@ paths:
   - <string>
 [ timeout: <duration> | default = 10s ]
 ```
+### `<nomad_sd_config>`
+
+Nomad SD configurations allow retrieving scrape targets from [Nomad's](https://www.nomadproject.io/)
+Service API.
+
+The following meta labels are available on targets during [relabeling](#relabel_config):
+
+* `__meta_nomad_address`: the service address of the target
+* `__meta_nomad_dc`: the datacenter name for the target
+* `__meta_nomad_namespace`: the namespace of the target
+* `__meta_nomad_node`: the node name defined for the target
+* `__meta_nomad_service`: the name of the service the target belongs to
+* `__meta_nomad_service_address`: the service address of the target
+* `__meta_nomad_service_id`: the service ID of the target
+* `__meta_nomad_service_port`: the service port of the target
+* `__meta_nomad_tags`: the list of tags of the target joined by the tag separator
+
+```yaml
+# The information to access the Nomad API. It is to be defined
+# as the Nomad documentation requires.
+[ allow_stale: <boolean> | default = true ]
+[ datacenter: <string> ]
+[ namespace: <string> | default = default ]
+[ refresh_interval: <duration> | default = 60s ]
+[ region: <string> | default = global ]
+[ server: <host> ]
+[ tag_separator: <string> | default = ,]
+
+# Authentication information used to authenticate to the nomad server.
+# Note that `basic_auth`, `authorization` and `oauth2` options are
+# mutually exclusive.
+# `password` and `password_file` are mutually exclusive.
+
+# Optional HTTP basic authentication information.
+basic_auth:
+  [ username: <string> ]
+  [ password: <secret> ]
+  [ password_file: <string> ]
+
+# Optional `Authorization` header configuration.
+authorization:
+  # Sets the authentication type.
+  [ type: <string> | default: Bearer ]
+  # Sets the credentials. It is mutually exclusive with
+  # `credentials_file`.
+  [ credentials: <secret> ]
+  # Sets the credentials to the credentials read from the configured file.
+  # It is mutually exclusive with `credentials`.
+  [ credentials_file: <filename> ]
+
+# Optional OAuth 2.0 configuration.
+oauth2:
+  [ <oauth2> ]
+
+# Optional proxy URL.
+[ proxy_url: <string> ]
+
+# Configure whether HTTP requests follow HTTP 3xx redirects.
+[ follow_redirects: <boolean> | default = true ]
+
+# Whether to enable HTTP2.
+[ enable_http2: <bool> | default: true ]
+
+# TLS configuration.
+tls_config:
+  [ <tls_config> ]
+```
 
 ### `<serverset_sd_config>`
 
@@ -2866,6 +2937,10 @@ marathon_sd_configs:
 nerve_sd_configs:
   [ - <nerve_sd_config> ... ]
 
+# List of Nomad service discovery configurations.
+nomad_sd_configs:
+  [ - <nomad_sd_config> ... ]
+
 # List of OpenStack service discovery configurations.
 openstack_sd_configs:
   [ - <openstack_sd_config> ... ]

documentation/examples/prometheus-nomad.yml

@@ -0,0 +1,23 @@
+# An example scrape configuration for running Prometheus with
+# Nomad build in service discovery.
+#
+# The following config can be used to monitor services running on
+# a nomad that is started using the getting started tutorial [1]
+#
+# sudo nomad agent -dev -bind 0.0.0.0 -log-level INFO
+#
+# [1] https://learn.hashicorp.com/tutorials/nomad/get-started-run?in=nomad/get-started
+
+scrape_configs:
+  # Make Prometheus scrape itself for metrics.
+  - job_name: "prometheus"
+    static_configs:
+      - targets: ["localhost:9090"]
+
+  # Discover Nomad services to scrape.
+  - job_name: 'nomad_sd'
+    nomad_sd_configs:
+      - server: 'http://localhost:4646'
+    relabel_configs:
+      - source_labels: [__meta_nomad_service]
+        target_label: job

go.mod

@@ -28,6 +28,7 @@ require (
 	github.com/grafana/regexp v0.0.0-20220304095617-2e8d9baf4ac2
 	github.com/grpc-ecosystem/grpc-gateway v1.16.0
 	github.com/hashicorp/consul/api v1.13.0
+	github.com/hashicorp/nomad/api v0.0.0-20220621200911-46b41bc256ee
 	github.com/hetznercloud/hcloud-go v1.33.2
 	github.com/ionos-cloud/sdk-go/v6 v6.0.5851
 	github.com/json-iterator/go v1.1.12
@@ -128,7 +129,9 @@ require (
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/google/uuid v1.2.0 // indirect
 	github.com/googleapis/gax-go/v2 v2.4.0 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.10.2 // indirect
+	github.com/hashicorp/cronexpr v1.1.1 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-hclog v0.12.2 // indirect
 	github.com/hashicorp/go-immutable-radix v1.2.0 // indirect

go.sum

@@ -187,6 +187,7 @@ github.com/docker/docker v20.10.16+incompatible h1:2Db6ZR/+FUR3hqPMwnogOPHFn405c
 github.com/docker/docker v20.10.16+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
 github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKohAFqRJQ=
 github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec=
+github.com/docker/go-units v0.3.3/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=
 github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
@@ -444,6 +445,7 @@ github.com/gorilla/mux v1.6.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2z
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/websocket v0.0.0-20170926233335-4201258b820c/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
+github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/grafana/regexp v0.0.0-20220304095617-2e8d9baf4ac2 h1:uirlL/j72L93RhV4+mkWhjv0cov2I0MIgPOG9rMDr1k=
 github.com/grafana/regexp v0.0.0-20220304095617-2e8d9baf4ac2/go.mod h1:M5qHK+eWfAv8VR/265dIuEpL3fNfeC21tXXp9itM24A=
@@ -462,6 +464,8 @@ github.com/hashicorp/consul/api v1.13.0/go.mod h1:ZlVrynguJKcYr54zGaDbaL3fOvKC9m
 github.com/hashicorp/consul/sdk v0.3.0/go.mod h1:VKf9jXwCTEY1QZP2MOLRhb5i/I/ssyNV1vwHyQBF0x8=
 github.com/hashicorp/consul/sdk v0.8.0 h1:OJtKBtEjboEZvG6AOUdh4Z1Zbyu0WcxQ0qatRrZHTVU=
 github.com/hashicorp/consul/sdk v0.8.0/go.mod h1:GBvyrGALthsZObzUGsfgHZQDXjg4lOjagTIwIR1vPms=
+github.com/hashicorp/cronexpr v1.1.1 h1:NJZDd87hGXjoZBdvyCF9mX4DCq5Wy7+A/w+A7q0wn6c=
+github.com/hashicorp/cronexpr v1.1.1/go.mod h1:P4wA0KBl9C5q2hABiMO7cp6jcIg96CDh1Efb3g1PWA4=
 github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
 github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
 github.com/hashicorp/go-cleanhttp v0.5.0/go.mod h1:JpRdi6/HCYpAwUzNwuwqhbovhLtngrth3wmdIIUrZ80=
@@ -507,6 +511,8 @@ github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2p
 github.com/hashicorp/memberlist v0.3.0/go.mod h1:MS2lj3INKhZjWNqd3N0m3J+Jxf3DAOnAH9VT3Sh9MUE=
 github.com/hashicorp/memberlist v0.3.1 h1:MXgUXLqva1QvpVEDQW1IQLG0wivQAtmFlHRQ+1vWZfM=
 github.com/hashicorp/memberlist v0.3.1/go.mod h1:MS2lj3INKhZjWNqd3N0m3J+Jxf3DAOnAH9VT3Sh9MUE=
+github.com/hashicorp/nomad/api v0.0.0-20220621200911-46b41bc256ee h1:mI5pzBBNGDNkvO28JkIIaQQ6L/pY+IG4uX3LVLrMb/o=
+github.com/hashicorp/nomad/api v0.0.0-20220621200911-46b41bc256ee/go.mod h1:b/AoT79m3PEpb6tKCFKva/M+q1rKJNUk5mdu1S8DymM=
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
 github.com/hashicorp/serf v0.9.6 h1:uuEX1kLR6aoda1TBttmJQKDLZE1Ob7KN0NPdE7EtCDc=
 github.com/hashicorp/serf v0.9.6/go.mod h1:TXZNMjZQijwlDvp+r0b63xZ45H7JmCmgg4gpTwn9UV4=
@@ -566,8 +572,9 @@ github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
-github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
+github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
+github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -616,8 +623,9 @@ github.com/mitchellh/cli v1.1.0/go.mod h1:xcISNoH86gajksDmfB23e/pu+B+GeFRMYmoHXx
 github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
-github.com/mitchellh/go-testing-interface v1.0.0 h1:fzU/JVNcaqHQEcVFAKeR41fkiLdIPrefOvVG1VZ96U0=
 github.com/mitchellh/go-testing-interface v1.0.0/go.mod h1:kRemZodwjscx+RGhAo8eIhFbs2+BFgRtFPeD/KE+zxI=
+github.com/mitchellh/go-testing-interface v1.14.1 h1:jrgshOhYAUVNMAJiKbEu7EqAwgJJ2JqpQmpLJOu07cU=
+github.com/mitchellh/go-testing-interface v1.14.1/go.mod h1:gfgS7OtZj6MA4U1UrDRp04twqAjfvlZyCfX3sDjEym8=
 github.com/mitchellh/go-wordwrap v1.0.0/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
 github.com/mitchellh/gox v0.4.0/go.mod h1:Sd9lOJ0+aimLBi73mGofS1ycjY8lL3uZM3JPS42BGNg=
 github.com/mitchellh/iochan v1.0.0/go.mod h1:JwYml1nuB7xOzsp52dPpHFffvOCDupsG0QubkSMEySY=
@@ -764,6 +772,8 @@ github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6L
 github.com/rogpeppe/go-internal v1.1.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/rogpeppe/go-internal v1.2.2/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/rogpeppe/go-internal v1.6.1 h1:/FiVV8dS/e+YqF2JvO3yXRFbBLTIuSDkuC7aBOAvL+k=
+github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/rs/cors v1.8.2/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
 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=

plugins.yml

@@ -11,6 +11,7 @@
 - github.com/prometheus/prometheus/discovery/linode
 - github.com/prometheus/prometheus/discovery/marathon
 - github.com/prometheus/prometheus/discovery/moby
+- github.com/prometheus/prometheus/discovery/nomad
 - github.com/prometheus/prometheus/discovery/openstack
 - github.com/prometheus/prometheus/discovery/puppetdb
 - github.com/prometheus/prometheus/discovery/scaleway

plugins/plugins.go

@@ -55,6 +55,9 @@ import (
 	// Register moby plugin.
 	_ "github.com/prometheus/prometheus/discovery/moby"
 
+	// Register nomad plugin.
+	_ "github.com/prometheus/prometheus/discovery/nomad"
+
 	// Register openstack plugin.
 	_ "github.com/prometheus/prometheus/discovery/openstack"