internal metrics: add grafana version

pkg/cmd/grafana-server/main.go

@@ -14,6 +14,7 @@ import (
 	"net/http"
 	_ "net/http/pprof"
 
+	"github.com/grafana/grafana/pkg/metrics"
 	"github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/services/sqlstore"
 	"github.com/grafana/grafana/pkg/setting"
@@ -29,7 +30,7 @@ import (
 	_ "github.com/grafana/grafana/pkg/tsdb/testdata"
 )
 
-var version = "4.1.0"
+var version = "4.6.0"
 var commit = "NA"
 var buildstamp string
 var build_date string
@@ -80,6 +81,8 @@ func main() {
 	setting.BuildCommit = commit
 	setting.BuildStamp = buildstampInt64
 
+	metrics.M_Grafana_Version.WithLabelValues(version).Set(1)
+
 	server := NewGrafanaServer()
 	server.Start()
 }

pkg/metrics/metrics.go

@@ -56,6 +56,7 @@ var (
 	M_StatTotal_Users        prometheus.Gauge
 	M_StatTotal_Orgs         prometheus.Gauge
 	M_StatTotal_Playlists    prometheus.Gauge
+	M_Grafana_Version        *prometheus.GaugeVec
 )
 
 func init() {
@@ -263,6 +264,13 @@ func init() {
 		Help:      "total amount of playlists",
 		Namespace: exporterName,
 	})
+
+	M_Grafana_Version = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+		Name:      "info",
+		Help:      "Information about the Grafana",
+		Namespace: exporterName,
+	}, []string{"version"})
+
 }
 
 func initMetricVars(settings *MetricSettings) {
@@ -298,7 +306,8 @@ func initMetricVars(settings *MetricSettings) {
 		M_StatTotal_Dashboards,
 		M_StatTotal_Users,
 		M_StatTotal_Orgs,
-		M_StatTotal_Playlists)
+		M_StatTotal_Playlists,
+		M_Grafana_Version)
 
 	go instrumentationLoop(settings)
 }