diff --git a/dtmsvr/dtmsvr.go b/dtmsvr/dtmsvr.go
index 7ece96d..91073aa 100644
--- a/dtmsvr/dtmsvr.go
+++ b/dtmsvr/dtmsvr.go
@@ -23,7 +23,7 @@ var metricsPort = 8889
 func StartSvr() {
 	dtmcli.Logf("start dtmsvr")
 	app := common.GetGinApp()
-	app = HTTP_metrics(app)
+	app = httpMetrics(app)
 	addRoute(app)
 	dtmcli.Logf("dtmsvr listen at: %d", dtmsvrPort)
 	go app.Run(fmt.Sprintf(":%d", dtmsvrPort))
@@ -32,7 +32,7 @@ func StartSvr() {
 	dtmcli.FatalIfError(err)
 	s := grpc.NewServer(
 		grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(
-			grpc.UnaryServerInterceptor(GRPC_metrics), grpc.UnaryServerInterceptor(dtmgrpc.GrpcServerLog)),
+			grpc.UnaryServerInterceptor(grpcMetrics), grpc.UnaryServerInterceptor(dtmgrpc.GrpcServerLog)),
 		))
 	dtmgrpc.RegisterDtmServer(s, &dtmServer{})
 	dtmcli.Logf("grpc listening at %v", lis.Addr())
@@ -43,7 +43,7 @@ func StartSvr() {
 
 	// prometheus exporter
 	dtmcli.Logf("prometheus exporter listen at: %d", metricsPort)
-	PrometheusHttpRun(fmt.Sprintf("%d", metricsPort))
+	prometheusHTTPRun(fmt.Sprintf("%d", metricsPort))
 	time.Sleep(100 * time.Millisecond)
 }
 
diff --git a/dtmsvr/metrics.go b/dtmsvr/metrics.go
index 273675c..d24f310 100644
--- a/dtmsvr/metrics.go
+++ b/dtmsvr/metrics.go
@@ -37,14 +37,14 @@ var (
 		[]string{"model", "gid", "branchid", "branchtype", "status"})
 )
 
-func PrometheusHttpRun(port string) {
+func prometheusHTTPRun(port string) {
 	go func() {
-		http.Handle("/metrics", promhttp.Handler())
+		http.Handle("/api/metrics", promhttp.Handler())
 		http.ListenAndServe(":"+port, nil)
 	}()
 }
 
-func HTTP_metrics(app *gin.Engine) *gin.Engine {
+func httpMetrics(app *gin.Engine) *gin.Engine {
 	app.Use(func(c *gin.Context) {
 		api := extractFromPath(c.Request.RequestURI)
 		timer := prometheus.NewTimer(prometheus.ObserverFunc(func(v float64) {
@@ -64,7 +64,7 @@ func HTTP_metrics(app *gin.Engine) *gin.Engine {
 	return app
 }
 
-func GRPC_metrics(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
+func grpcMetrics(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
 	api := extractFromPath(info.FullMethod)
 	timer := prometheus.NewTimer(prometheus.ObserverFunc(func(v float64) {
 		responseTime.WithLabelValues("grpc", api).Observe(v)
@@ -79,7 +79,7 @@ func GRPC_metrics(ctx context.Context, req interface{}, info *grpc.UnaryServerIn
 	return m, err
 }
 
-func TransactionMetrics(global *TransGlobal, status bool) {
+func transactionMetrics(global *TransGlobal, status bool) {
 	if status {
 		transactionTotal.WithLabelValues(global.TransType, global.Gid, "ok").Inc()
 	} else {
@@ -87,7 +87,7 @@ func TransactionMetrics(global *TransGlobal, status bool) {
 	}
 }
 
-func BranchMetrics(global *TransGlobal, branch *TransBranch, status bool) {
+func branchMetrics(global *TransGlobal, branch *TransBranch, status bool) {
 	if status {
 		branchTotal.WithLabelValues(global.TransType, global.Gid, branch.BranchID, branch.BranchType, "ok").Inc()
 	} else {
diff --git a/dtmsvr/trans.go b/dtmsvr/trans.go
index 32e4eda..f1da4f5 100644
--- a/dtmsvr/trans.go
+++ b/dtmsvr/trans.go
@@ -119,7 +119,7 @@ func (t *TransGlobal) getProcessor() transProcessor {
 // Process process global transaction once
 func (t *TransGlobal) Process(db *common.DB, waitResult bool) dtmcli.M {
 	r := t.process(db, waitResult)
-	TransactionMetrics(t, r["dtm_result"] == dtmcli.ResultSuccess)
+	transactionMetrics(t, r["dtm_result"] == dtmcli.ResultSuccess)
 }
 
 func (t *TransGlobal) process(db *common.DB, waitResult bool) dtmcli.M {
@@ -208,11 +208,11 @@ func (t *TransGlobal) execBranch(db *common.DB, branch *TransBranch) {
 	if strings.Contains(body, dtmcli.ResultSuccess) {
 		t.touch(db, config.TransCronInterval)
 		branch.changeStatus(db, dtmcli.StatusSucceed)
-		BranchMetrics(t, branch, true)
+		branchMetrics(t, branch, true)
 	} else if t.TransType == "saga" && branch.BranchType == dtmcli.BranchAction && strings.Contains(body, dtmcli.ResultFailure) {
 		t.touch(db, config.TransCronInterval)
 		branch.changeStatus(db, dtmcli.StatusFailed)
-		BranchMetrics(t, branch, false)
+		branchMetrics(t, branch, false)
 	} else {
 		panic(fmt.Errorf("http result should contains SUCCESS|FAILURE. grpc error should return nil|Aborted. \nrefer to: https://dtm.pub/summary/arch.html#http\nunkown result will be retried: %s", body))
 	}