Adds eureka service discovery (#913)

* Adds eureka service discovery
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/851
Netflix service discovery for AWS

* Apply suggestions from code review

Co-authored-by: Aliaksandr Valialkin <valyala@gmail.com>

README.md

@@ -306,6 +306,8 @@ Currently the following [scrape_config](https://prometheus.io/docs/prometheus/la
 * [dns_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dns_sd_config)
 * [openstack_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#openstack_sd_config)
 * [dockerswarm_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config)
+* [eureka_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka_sd_config)
+
 
 Other `*_sd_config` types will be supported in the future.
 

app/vmagent/README.md

@@ -169,6 +169,8 @@ The following scrape types in [scrape_config](https://prometheus.io/docs/prometh
   [OpenStack identity API v3](https://docs.openstack.org/api-ref/identity/v3/) is supported only.
 * `dockerswarm_sd_configs` - for scraping Docker Swarm targets.
   See [dockerswarm_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config) for details.
+* `eureka_sd_configs` - for scraping targets registered in [Netflix Eureka](https://github.com/Netflix/eureka).
+  See [eureka_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka_sd_config) for details.
 
 File feature requests at [our issue tracker](https://github.com/VictoriaMetrics/VictoriaMetrics/issues) if you need other service discovery mechanisms to be supported by `vmagent`.
 

docs/CHANGELOG.md

@@ -7,6 +7,8 @@
   snap install victoriametrics
   ```
 * FEATURE: vminsert: export `vm_rpc_vmstorage_is_reachable` metric, which can be used for monitoring reachability of vmstorage nodes from vminsert nodes.
+* FEATURE: vmagent: add Netflix Eureka service discovery (aka [eureka_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka_sd_config)).
+See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/851
 * FEATURE: add `-loggerWarnsPerSecondLimit` command-line flag for rate limiting of WARN messages in logs. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/905
 * FEATURE: apply `loggerErrorsPerSecondLimit` and `-loggerWarnsPerSecondLimit` rate limit per caller. I.e. log messages are suppressed if the same caller logs the same message
   at the rate exceeding the given limit. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/905#issuecomment-729395855

docs/Single-server-VictoriaMetrics.md

@@ -306,6 +306,8 @@ Currently the following [scrape_config](https://prometheus.io/docs/prometheus/la
 * [dns_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dns_sd_config)
 * [openstack_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#openstack_sd_config)
 * [dockerswarm_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config)
+* [eureka_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka_sd_config)
+
 
 Other `*_sd_config` types will be supported in the future.
 

docs/vmagent.md

@@ -169,6 +169,8 @@ The following scrape types in [scrape_config](https://prometheus.io/docs/prometh
   [OpenStack identity API v3](https://docs.openstack.org/api-ref/identity/v3/) is supported only.
 * `dockerswarm_sd_configs` - for scraping Docker Swarm targets.
   See [dockerswarm_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config) for details.
+* `eureka_sd_configs` - for scraping targets registered in [Netflix Eureka](https://github.com/Netflix/eureka).
+  See [eureka_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka_sd_config) for details.
 
 File feature requests at [our issue tracker](https://github.com/VictoriaMetrics/VictoriaMetrics/issues) if you need other service discovery mechanisms to be supported by `vmagent`.
 

lib/promscrape/config.go

@@ -20,6 +20,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dns"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dockerswarm"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/ec2"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/eureka"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/gce"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/kubernetes"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/openstack"
@@ -76,6 +77,7 @@ type ScrapeConfig struct {
 	KubernetesSDConfigs  []kubernetes.SDConfig       `yaml:"kubernetes_sd_configs,omitempty"`
 	OpenStackSDConfigs   []openstack.SDConfig        `yaml:"openstack_sd_configs,omitempty"`
 	ConsulSDConfigs      []consul.SDConfig           `yaml:"consul_sd_configs,omitempty"`
+	EurekaSDConfigs      []eureka.SDConfig           `yaml:"eureka_sd_configs,omitempty"`
 	DockerSwarmConfigs   []dockerswarm.SDConfig      `yaml:"dockerswarm_sd_configs,omitempty"`
 	DNSSDConfigs         []dns.SDConfig              `yaml:"dns_sd_configs,omitempty"`
 	EC2SDConfigs         []ec2.SDConfig              `yaml:"ec2_sd_configs,omitempty"`
@@ -293,6 +295,34 @@ func (cfg *Config) getConsulSDScrapeWork(prev []ScrapeWork) []ScrapeWork {
 	return dst
 }
 
+// getEurekaSDScrapeWork returns `eureka_sd_configs` ScrapeWork from cfg.
+func (cfg *Config) getEurekaSDScrapeWork(prev []ScrapeWork) []ScrapeWork {
+	swsPrevByJob := getSWSByJob(prev)
+	dst := make([]ScrapeWork, 0, len(prev))
+	for i := range cfg.ScrapeConfigs {
+		sc := &cfg.ScrapeConfigs[i]
+		dstLen := len(dst)
+		ok := true
+		for j := range sc.EurekaSDConfigs {
+			sdc := &sc.EurekaSDConfigs[j]
+			var okLocal bool
+			dst, okLocal = appendEurekaScrapeWork(dst, sdc, cfg.baseDir, sc.swc)
+			if ok {
+				ok = okLocal
+			}
+		}
+		if ok {
+			continue
+		}
+		swsPrev := swsPrevByJob[sc.swc.jobName]
+		if len(swsPrev) > 0 {
+			logger.Errorf("there were errors when discovering eureka targets for job %q, so preserving the previous targets", sc.swc.jobName)
+			dst = append(dst[:dstLen], swsPrev...)
+		}
+	}
+	return dst
+}
+
 // getDNSSDScrapeWork returns `dns_sd_configs` ScrapeWork from cfg.
 func (cfg *Config) getDNSSDScrapeWork(prev []ScrapeWork) []ScrapeWork {
 	swsPrevByJob := getSWSByJob(prev)
@@ -537,6 +567,15 @@ func appendConsulScrapeWork(dst []ScrapeWork, sdc *consul.SDConfig, baseDir stri
 	return appendScrapeWorkForTargetLabels(dst, swc, targetLabels, "consul_sd_config"), true
 }
 
+func appendEurekaScrapeWork(dst []ScrapeWork, sdc *eureka.SDConfig, baseDir string, swc *scrapeWorkConfig) ([]ScrapeWork, bool) {
+	targetLabels, err := eureka.GetLabels(sdc, baseDir)
+	if err != nil {
+		logger.Errorf("error when discovering eureka targets for `job_name` %q: %s; skipping it", swc.jobName, err)
+		return dst, false
+	}
+	return appendScrapeWorkForTargetLabels(dst, swc, targetLabels, "eureka_sd_config"), true
+}
+
 func appendDNSScrapeWork(dst []ScrapeWork, sdc *dns.SDConfig, swc *scrapeWorkConfig) ([]ScrapeWork, bool) {
 	targetLabels, err := dns.GetLabels(sdc)
 	if err != nil {

lib/promscrape/discovery/eureka/api.go

@@ -0,0 +1,81 @@
+package eureka
+
+import (
+	"encoding/xml"
+	"fmt"
+	"strings"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
+)
+
+var configMap = discoveryutils.NewConfigMap()
+
+type apiConfig struct {
+	client *discoveryutils.Client
+}
+
+func newAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
+	var (
+		ba    *promauth.BasicAuthConfig
+		token string
+	)
+	if sdc.Token != nil {
+		token = *sdc.Token
+	}
+	port := 80
+	if sdc.Port == nil {
+		sdc.Port = &port
+	}
+	if len(sdc.Username) > 0 {
+		ba = &promauth.BasicAuthConfig{
+			Username: sdc.Username,
+			Password: sdc.Password,
+		}
+		token = ""
+	}
+	ac, err := promauth.NewConfig(baseDir, ba, token, "", sdc.TLSConfig)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse auth config: %w", err)
+	}
+	apiServer := sdc.Server
+	if apiServer == "" {
+		apiServer = "localhost:8080/eureka/v2"
+	}
+	if !strings.Contains(apiServer, "://") {
+		scheme := sdc.Scheme
+		if scheme == "" {
+			scheme = "http"
+		}
+		apiServer = scheme + "://" + apiServer
+	}
+	client, err := discoveryutils.NewClient(apiServer, ac)
+	if err != nil {
+		return nil, fmt.Errorf("cannot create HTTP client for %q: %w", apiServer, err)
+	}
+	cfg := &apiConfig{
+		client: client,
+	}
+	return cfg, nil
+}
+
+func getAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
+	v, err := configMap.Get(sdc, func() (interface{}, error) { return newAPIConfig(sdc, baseDir) })
+	if err != nil {
+		return nil, err
+	}
+	return v.(*apiConfig), nil
+
+}
+
+func getAPIResponse(cfg *apiConfig, path string) ([]byte, error) {
+	return cfg.client.GetAPIResponse(path)
+}
+
+func parseAPIResponse(data []byte) (*applications, error) {
+	var apps applications
+	if err := xml.Unmarshal(data, &apps); err != nil {
+		return nil, fmt.Errorf("failed parse eureka api response: %q, err: %w", data, err)
+	}
+	return &apps, nil
+}

lib/promscrape/discovery/eureka/api_test.go

@@ -0,0 +1,107 @@
+package eureka
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_parseAPIResponse(t *testing.T) {
+	type args struct {
+		data []byte
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    *applications
+		wantErr bool
+	}{
+		{
+			name: "parse ok 1 app with instance",
+			args: args{
+				data: []byte(`<applications>
+  <versions__delta>1</versions__delta>
+  <apps__hashcode>UP_1_</apps__hashcode>
+  <application>
+    <name>HELLO-NETFLIX-OSS</name>
+    <instance>
+      <hostName>98de25ebef42</hostName>
+      <app>HELLO-NETFLIX-OSS</app>
+      <ipAddr>10.10.0.3</ipAddr>
+      <status>UP</status>
+      <overriddenstatus>UNKNOWN</overriddenstatus>
+      <port enabled="true">8080</port>
+      <securePort enabled="false">443</securePort>
+      <countryId>1</countryId>
+      <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">
+        <name>MyOwn</name>
+      </dataCenterInfo>
+      <leaseInfo>
+        <renewalIntervalInSecs>30</renewalIntervalInSecs>
+        <durationInSecs>90</durationInSecs>
+        <registrationTimestamp>1605757726477</registrationTimestamp>
+        <lastRenewalTimestamp>1605759135484</lastRenewalTimestamp>
+        <evictionTimestamp>0</evictionTimestamp>
+        <serviceUpTimestamp>1605757725913</serviceUpTimestamp>
+      </leaseInfo>
+      <metadata class="java.util.Collections$EmptyMap"/>
+      <appGroupName>UNKNOWN</appGroupName>
+      <homePageUrl>http://98de25ebef42:8080/</homePageUrl>
+      <statusPageUrl>http://98de25ebef42:8080/Status</statusPageUrl>
+      <healthCheckUrl>http://98de25ebef42:8080/healthcheck</healthCheckUrl>
+      <vipAddress>HELLO-NETFLIX-OSS</vipAddress>
+      <isCoordinatingDiscoveryServer>false</isCoordinatingDiscoveryServer>
+      <lastUpdatedTimestamp>1605757726478</lastUpdatedTimestamp>
+      <lastDirtyTimestamp>1605757725753</lastDirtyTimestamp>
+      <actionType>ADDED</actionType>
+    </instance>
+  </application>
+</applications>`),
+			},
+			want: &applications{
+				Applications: []Application{
+					{
+						Name: "HELLO-NETFLIX-OSS",
+						Instances: []Instance{
+							{
+								HostName:         "98de25ebef42",
+								HomePageURL:      "http://98de25ebef42:8080/",
+								StatusPageURL:    "http://98de25ebef42:8080/Status",
+								HealthCheckURL:   "http://98de25ebef42:8080/healthcheck",
+								App:              "HELLO-NETFLIX-OSS",
+								IPAddr:           "10.10.0.3",
+								VipAddress:       "HELLO-NETFLIX-OSS",
+								SecureVipAddress: "",
+								Status:           "UP",
+								Port: Port{
+									Enabled: true,
+									Port:    8080,
+								},
+								SecurePort: Port{
+									Port: 443,
+								},
+								DataCenterInfo: DataCenterInfo{
+									Name: "MyOwn",
+								},
+								Metadata:   MetaData{},
+								CountryID:  1,
+								InstanceID: "",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := parseAPIResponse(tt.args.data)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("parseAPIResponse() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("unxpected response for parseAPIResponse() \ngot  = %v, \nwant %v", got, tt.want)
+			}
+		})
+	}
+}

lib/promscrape/discovery/eureka/eureka.go

@@ -0,0 +1,148 @@
+package eureka
+
+import (
+	"encoding/xml"
+	"fmt"
+	"strconv"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
+)
+
+const appsAPIPath = "/apps"
+
+// SDConfig represents service discovery config for eureka.
+//
+// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka
+type SDConfig struct {
+	Server     string              `yaml:"server,omitempty"`
+	Token      *string             `yaml:"token"`
+	Datacenter string              `yaml:"datacenter"`
+	Scheme     string              `yaml:"scheme,omitempty"`
+	Username   string              `yaml:"username"`
+	Password   string              `yaml:"password"`
+	TLSConfig  *promauth.TLSConfig `yaml:"tls_config,omitempty"`
+	// RefreshInterval time.Duration `yaml:"refresh_interval"`
+	// refresh_interval is obtained from `-promscrape.ec2SDCheckInterval` command-line option.
+	Port *int `yaml:"port,omitempty"`
+}
+type applications struct {
+	Applications []Application `xml:"application"`
+}
+
+// Application - eureka application https://github.com/Netflix/eureka/wiki/Eureka-REST-operations/
+type Application struct {
+	Name      string     `xml:"name"`
+	Instances []Instance `xml:"instance"`
+}
+
+// Port - eureka instance port.
+type Port struct {
+	Port    int  `xml:",chardata"`
+	Enabled bool `xml:"enabled,attr"`
+}
+
+// Instance - eureka instance https://github.com/Netflix/eureka/wiki/Eureka-REST-operations
+type Instance struct {
+	HostName         string         `xml:"hostName"`
+	HomePageURL      string         `xml:"homePageUrl"`
+	StatusPageURL    string         `xml:"statusPageUrl"`
+	HealthCheckURL   string         `xml:"healthCheckUrl"`
+	App              string         `xml:"app"`
+	IPAddr           string         `xml:"ipAddr"`
+	VipAddress       string         `xml:"vipAddress"`
+	SecureVipAddress string         `xml:"secureVipAddress"`
+	Status           string         `xml:"status"`
+	Port             Port           `xml:"port"`
+	SecurePort       Port           `xml:"securePort"`
+	DataCenterInfo   DataCenterInfo `xml:"dataCenterInfo"`
+	Metadata         MetaData       `xml:"metadata"`
+	CountryID        int            `xml:"countryId"`
+	InstanceID       string         `xml:"instanceId"`
+}
+
+// MetaData - eureka objects metadata.
+type MetaData struct {
+	Items []Tag `xml:",any"`
+}
+
+// Tag - eureka metadata tag - list of k/v values.
+type Tag struct {
+	XMLName xml.Name
+	Content string `xml:",innerxml"`
+}
+
+// DataCenterInfo -eureka datacentre metadata
+type DataCenterInfo struct {
+	Name     string   `xml:"name"`
+	Metadata MetaData `xml:"metadata"`
+}
+
+// GetLabels returns Eureka labels according to sdc.
+func GetLabels(sdc *SDConfig, baseDir string) ([]map[string]string, error) {
+	cfg, err := getAPIConfig(sdc, baseDir)
+	if err != nil {
+		return nil, fmt.Errorf("cannot get API config: %w", err)
+	}
+	data, err := getAPIResponse(cfg, appsAPIPath)
+	if err != nil {
+		return nil, err
+	}
+	apps, err := parseAPIResponse(data)
+	if err != nil {
+		return nil, err
+	}
+	return addInstanceLabels(apps, *sdc.Port), nil
+}
+
+func addInstanceLabels(applications *applications, port int) []map[string]string {
+	var ms []map[string]string
+	for _, app := range applications.Applications {
+		for _, instance := range app.Instances {
+			var targetAddress string
+			if instance.Port.Port > 0 {
+				targetAddress = discoveryutils.JoinHostPort(instance.HostName, instance.Port.Port)
+			} else {
+				targetAddress = discoveryutils.JoinHostPort(instance.HostName, port)
+			}
+			m := map[string]string{
+				"__address__":                                targetAddress,
+				"instance":                                   instance.InstanceID,
+				"__meta_eureka_app_instance_app_nanem":       app.Name,
+				"__meta_eureka_app_instance_hostname":        instance.HostName,
+				"__meta_eureka_app_instance_homepage_url":    instance.HomePageURL,
+				"__meta_eureka_app_instance_statuspage_url":  instance.StatusPageURL,
+				"__meta_eureka_app_instance_healthcheck_url": instance.HealthCheckURL,
+				"__meta_eureka_app_instance_ip_addr":         instance.IPAddr,
+				"__meta_eureka_app_instance_vip_address":     instance.VipAddress,
+				"__meta_eureka_app_instance_status":          instance.Status,
+				"__meta_eureka_app_instance_country_id":      strconv.Itoa(instance.CountryID),
+				"__meta_eureka_app_instance_id":              instance.InstanceID,
+			}
+			if len(instance.SecureVipAddress) > 0 {
+				m["__meta_eureka_app_instance_secure_vip_address"] = instance.SecureVipAddress
+			}
+			if instance.Port.Port > 0 {
+				m["__meta_eureka_app_instance_port"] = strconv.Itoa(instance.Port.Port)
+				m["__meta_eureka_app_instance_port_enabled"] = strconv.FormatBool(instance.Port.Enabled)
+			}
+			if instance.SecurePort.Port > 0 {
+				m["__meta_eureka_app_instance_secure_port"] = strconv.Itoa(instance.SecurePort.Port)
+				m["__meta_eureka_app_instance_secure_port_enabled"] = strconv.FormatBool(instance.SecurePort.Enabled)
+
+			}
+			if len(instance.DataCenterInfo.Name) > 0 {
+				m["__meta_eureka_app_instance_datacenterinfo_name"] = instance.DataCenterInfo.Name
+				for _, tag := range instance.DataCenterInfo.Metadata.Items {
+					m["__meta_eureka_app_instance_datacenterinfo_metadata_"+discoveryutils.SanitizeLabelName(tag.XMLName.Local)] = tag.Content
+				}
+			}
+			for _, tag := range instance.Metadata.Items {
+				m["__meta_eureka_app_instance_metadata_"+discoveryutils.SanitizeLabelName(tag.XMLName.Local)] = tag.Content
+			}
+			ms = append(ms, m)
+		}
+	}
+	return ms
+}

lib/promscrape/discovery/eureka/eureka_test.go

@@ -0,0 +1,83 @@
+package eureka
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
+)
+
+func Test_addInstanceLabels(t *testing.T) {
+	type args struct {
+		applications *applications
+		port         int
+	}
+	tests := []struct {
+		name string
+		args args
+		want [][]prompbmarshal.Label
+	}{
+		{
+			name: "1 application",
+			args: args{
+				port: 9100,
+				applications: &applications{
+					Applications: []Application{
+						{
+							Name: "test-app",
+							Instances: []Instance{
+								{
+									Status:         "Ok",
+									HealthCheckURL: "some-url",
+									HomePageURL:    "some-home-url",
+									StatusPageURL:  "some-status-url",
+									HostName:       "host-1",
+									IPAddr:         "10.15.11.11",
+									CountryID:      5,
+									VipAddress:     "10.15.11.11",
+									InstanceID:     "some-id",
+									Metadata: MetaData{Items: []Tag{
+										{
+											Content: "value-1",
+											XMLName: struct{ Space, Local string }{Local: "key-1"},
+										},
+									}},
+								},
+							},
+						},
+					},
+				},
+			},
+			want: [][]prompbmarshal.Label{
+				discoveryutils.GetSortedLabels(map[string]string{
+					"__address__":                                "host-1:9100",
+					"instance":                                   "some-id",
+					"__meta_eureka_app_instance_hostname":        "host-1",
+					"__meta_eureka_app_instance_app_nanem":       "test-app",
+					"__meta_eureka_app_instance_healthcheck_url": "some-url",
+					"__meta_eureka_app_instance_ip_addr":         "10.15.11.11",
+					"__meta_eureka_app_instance_vip_address":     "10.15.11.11",
+					"__meta_eureka_app_instance_country_id":      "5",
+					"__meta_eureka_app_instance_homepage_url":    "some-home-url",
+					"__meta_eureka_app_instance_statuspage_url":  "some-status-url",
+					"__meta_eureka_app_instance_id":              "some-id",
+					"__meta_eureka_app_instance_metadata_key_1":  "value-1",
+					"__meta_eureka_app_instance_status":          "Ok",
+				}),
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := addInstanceLabels(tt.args.applications, tt.args.port)
+			var sortedLabelss [][]prompbmarshal.Label
+			for _, labels := range got {
+				sortedLabelss = append(sortedLabelss, discoveryutils.GetSortedLabels(labels))
+			}
+			if !reflect.DeepEqual(sortedLabelss, tt.want) {
+				t.Fatalf("unexpected labels \ngot : %v, \nwant: %v", got, tt.want)
+			}
+		})
+	}
+}

lib/promscrape/scraper.go

@@ -28,6 +28,9 @@ var (
 	consulSDCheckInterval = flag.Duration("promscrape.consulSDCheckInterval", 30*time.Second, "Interval for checking for changes in consul. "+
 		"This works only if `consul_sd_configs` is configured in '-promscrape.config' file. "+
 		"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#consul_sd_config for details")
+	eurekaSDCheckInterval = flag.Duration("promscrape.eurekaSDCheckInterval", 30*time.Second, "Interval for checking for changes in eureka. "+
+		"This works only if `eureka_sd_configs` is configured in '-promscrape.config' file. "+
+		"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#eureka_sd_config for details")
 	dnsSDCheckInterval = flag.Duration("promscrape.dnsSDCheckInterval", 30*time.Second, "Interval for checking for changes in dns. "+
 		"This works only if `dns_sd_configs` is configured in '-promscrape.config' file. "+
 		"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dns_sd_config for details")
@@ -99,6 +102,7 @@ func runScraper(configFile string, pushData func(wr *prompbmarshal.WriteRequest)
 	scs.add("kubernetes_sd_configs", *kubernetesSDCheckInterval, func(cfg *Config, swsPrev []ScrapeWork) []ScrapeWork { return cfg.getKubernetesSDScrapeWork(swsPrev) })
 	scs.add("openstack_sd_configs", *openstackSDCheckInterval, func(cfg *Config, swsPrev []ScrapeWork) []ScrapeWork { return cfg.getOpenStackSDScrapeWork(swsPrev) })
 	scs.add("consul_sd_configs", *consulSDCheckInterval, func(cfg *Config, swsPrev []ScrapeWork) []ScrapeWork { return cfg.getConsulSDScrapeWork(swsPrev) })
+	scs.add("eureka_sd_configs", *eurekaSDCheckInterval, func(cfg *Config, swsPrev []ScrapeWork) []ScrapeWork { return cfg.getEurekaSDScrapeWork(swsPrev) })
 	scs.add("dns_sd_configs", *dnsSDCheckInterval, func(cfg *Config, swsPrev []ScrapeWork) []ScrapeWork { return cfg.getDNSSDScrapeWork(swsPrev) })
 	scs.add("ec2_sd_configs", *ec2SDCheckInterval, func(cfg *Config, swsPrev []ScrapeWork) []ScrapeWork { return cfg.getEC2SDScrapeWork(swsPrev) })
 	scs.add("gce_sd_configs", *gceSDCheckInterval, func(cfg *Config, swsPrev []ScrapeWork) []ScrapeWork { return cfg.getGCESDScrapeWork(swsPrev) })