Add build info for prometheus

metric/prometheus.go

@@ -18,6 +18,7 @@ import (
 	"net/http"
 	"reflect"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
@@ -40,6 +41,8 @@ func PrometheusMiddleWare(next http.Handler) http.Handler {
 
 	prometheus.MustRegister(summaryVec)
 
+	registerBuildInfo()
+
 	return http.HandlerFunc(func(writer http.ResponseWriter, q *http.Request) {
 		start := time.Now()
 		next.ServeHTTP(writer, q)
@@ -48,6 +51,28 @@ func PrometheusMiddleWare(next http.Handler) http.Handler {
 	})
 }
 
+func registerBuildInfo() {
+	buildInfo := prometheus.NewGaugeVec(prometheus.GaugeOpts{
+		Name:      "beego",
+		Subsystem: "build_info",
+		Help:      "The building information",
+		ConstLabels: map[string]string{
+			"appname": beego.BConfig.AppName,
+			"build_version":  beego.BuildVersion,
+			"build_revision": beego.BuildGitRevision,
+			"build_status":   beego.BuildStatus,
+			"build_tag":      beego.BuildTag,
+			"build_time": strings.Replace(beego.BuildTime, "--", " ", 1),
+			"go_version":     beego.GoVersion,
+			"git_branch":     beego.GitBranch,
+			"start_time": time.Now().Format("2006-01-02 15:04:05"),
+		},
+	}, []string{})
+
+	prometheus.MustRegister(buildInfo)
+	buildInfo.WithLabelValues().Set(1)
+}
+
 func report(dur time.Duration, writer http.ResponseWriter, q *http.Request, vec *prometheus.SummaryVec) {
 	ctrl := beego.BeeApp.Handlers
 	ctx := ctrl.GetContext()