Merge pull request #251 from nspcc-dev/248-add-version-metric

Add version metric

Author: roman-khimov

app.go

@@ -218,6 +218,7 @@ func (a *app) getResolverConfig() ([]string, *resolver.Config) {
 
 func (a *app) initMetrics() {
 	gateMetricsProvider := metrics.NewGateMetrics(a.pool)
+	gateMetricsProvider.SetGWVersion(Version)
 	a.metrics = newGateMetrics(a.log, gateMetricsProvider, a.cfg.GetBool(cfgPrometheusEnabled))
 }
 

metrics/metrics.go

@@ -38,6 +38,7 @@ type GateMetrics struct {
 
 type stateMetrics struct {
 	healthCheck prometheus.Gauge
+	gwVersion   *prometheus.GaugeVec
 }
 
 type poolMetricsCollector struct {
@@ -76,6 +77,14 @@ func newStateMetrics() *stateMetrics {
 			Name:      "health",
 			Help:      "Current HTTP gateway state",
 		}),
+		gwVersion: prometheus.NewGaugeVec(
+			prometheus.GaugeOpts{
+				Help:      "Gateway version",
+				Name:      "version",
+				Namespace: namespace,
+			},
+			[]string{"version"},
+		),
 	}
 }
 
@@ -234,3 +243,7 @@ func NewPrometheusService(log *zap.Logger, cfg Config) *Service {
 		log:         log.With(zap.String("service", "Prometheus")),
 	}
 }
+
+func (g *GateMetrics) SetGWVersion(ver string) {
+	g.gwVersion.WithLabelValues(ver).Add(1)
+}