diff --git a/server/api/metric.go b/server/api/metric.go
index 3bfab034cb2..a457895bddf 100644
--- a/server/api/metric.go
+++ b/server/api/metric.go
@@ -28,7 +28,7 @@ type queryMetric struct {
 	s *server.Server
 }
 
-func newQueryMetric(s *server.Server) *queryMetric {
+func newqueryMetric(s *server.Server) *queryMetric {
 	return &queryMetric{s: s}
 }
 
diff --git a/server/api/router.go b/server/api/router.go
index 85072af134b..0e129706b43 100644
--- a/server/api/router.go
+++ b/server/api/router.go
@@ -335,8 +335,8 @@ func createRouter(prefix string, svr *server.Server) *mux.Router {
 	registerFunc(apiRouter, "/ping", healthHandler.Ping, setMethods(http.MethodGet), setAuditBackend(prometheus))
 
 	// metric query use to query metric data, the protocol is compatible with prometheus.
-	registerFunc(apiRouter, "/metric/query", newQueryMetric(svr).queryMetric, setMethods(http.MethodGet, http.MethodPost), setAuditBackend(prometheus))
-	registerFunc(apiRouter, "/metric/query_range", newQueryMetric(svr).queryMetric, setMethods(http.MethodGet, http.MethodPost), setAuditBackend(prometheus))
+	registerFunc(apiRouter, "/metric/query", newqueryMetric(svr).queryMetric, setMethods(http.MethodGet, http.MethodPost), setAuditBackend(prometheus))
+	registerFunc(apiRouter, "/metric/query_range", newqueryMetric(svr).queryMetric, setMethods(http.MethodGet, http.MethodPost), setAuditBackend(prometheus))
 
 	pprofHandler := newPprofHandler(svr, rd)
 	// profile API
diff --git a/server/api/server_test.go b/server/api/server_test.go
index 7ebee9bcdfe..af41905ad86 100644
--- a/server/api/server_test.go
+++ b/server/api/server_test.go
@@ -242,7 +242,7 @@ func (suite *serviceTestSuite) TestServiceLabels() {
 		apiutil.NewAccessPath("/pd/api/v1/leader/resign", ""))
 	re.Equal("", serviceLabel)
 
-	accessPaths = suite.svr.GetServiceLabels("QueryMetric")
+	accessPaths = suite.svr.GetServiceLabels("queryMetric")
 	re.Len(accessPaths, 4)
 	sort.Slice(accessPaths, func(i, j int) bool {
 		if accessPaths[i].Path == accessPaths[j].Path {
@@ -260,10 +260,10 @@ func (suite *serviceTestSuite) TestServiceLabels() {
 	re.Equal(http.MethodPost, accessPaths[3].Method)
 	serviceLabel = suite.svr.GetAPIAccessServiceLabel(
 		apiutil.NewAccessPath("/pd/api/v1/metric/query", http.MethodPost))
-	re.Equal("QueryMetric", serviceLabel)
+	re.Equal("queryMetric", serviceLabel)
 	serviceLabel = suite.svr.GetAPIAccessServiceLabel(
 		apiutil.NewAccessPath("/pd/api/v1/metric/query", http.MethodGet))
-	re.Equal("QueryMetric", serviceLabel)
+	re.Equal("queryMetric", serviceLabel)
 }
 
 func (suite *adminTestSuite) TestCleanPath() {