prometheus: Added build_info metric.

cmd/run.go

@@ -41,6 +41,7 @@ var runCmd = &cobra.Command{
 		}
 
 		metrics := prometheus.New()
+		metrics.SetBuildInfo(cmd.Version)
 		manager := manager.New(repository, metrics, gitConfig.Path, cfg.Hostname, machineId)
 		go poller.Poller(manager, cfg.Remotes)
 		http.Serve(manager,

internal/prometheus/prometheus.go

@@ -9,12 +9,17 @@ import (
 
 type Prometheus struct {
 	promRegistry   *prometheus.Registry
+	buildInfo      *prometheus.GaugeVec
 	deploymentInfo *prometheus.GaugeVec
 	fetchCounter   *prometheus.CounterVec
 }
 
 func New() Prometheus {
 	promReg := prometheus.NewRegistry()
+	buildInfo := prometheus.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "comin_build_info",
+		Help: "Build info for comin.",
+        }, []string{"version"})
 	deploymentInfo := prometheus.NewGaugeVec(prometheus.GaugeOpts{
 		Name: "comin_deployment_info",
 		Help: "Info of the last deployment.",
@@ -23,10 +28,12 @@ func New() Prometheus {
 		Name: "comin_fetch_count",
 		Help: "Number of fetches per status",
 	}, []string{"remote_name", "status"})
+	promReg.MustRegister(buildInfo)
 	promReg.MustRegister(deploymentInfo)
 	promReg.MustRegister(fetchCounter)
 	return Prometheus{
 		promRegistry:   promReg,
+		buildInfo:      buildInfo,
 		deploymentInfo: deploymentInfo,
 		fetchCounter:   fetchCounter,
 	}
@@ -44,6 +51,11 @@ func (m Prometheus) IncFetchCounter(remoteName, status string) {
 	m.fetchCounter.With(prometheus.Labels{"remote_name": remoteName, "status": status}).Inc()
 }
 
+func (m Prometheus) SetBuildInfo(version string) {
+	m.buildInfo.Reset()
+	m.buildInfo.With(prometheus.Labels{"version": version}).Set(1)
+}
+
 func (m Prometheus) SetDeploymentInfo(commitId, status string) {
 	m.deploymentInfo.Reset()
 	m.deploymentInfo.With(prometheus.Labels{"commit_id": commitId, "status": status}).Set(1)