diff --git a/ddl/syncer.go b/ddl/syncer.go
index d7a911f15805f..3a2ed32313931 100644
--- a/ddl/syncer.go
+++ b/ddl/syncer.go
@@ -221,7 +221,7 @@ func (s *schemaVersionSyncer) UpdateSelfVersion(ctx context.Context, version int
 	err := PutKVToEtcd(ctx, s.etcdCli, putKeyNoRetry, s.selfSchemaVerPath, ver,
 		clientv3.WithLease(s.session.Lease()))
 
-	metrics.UpdateSelfVersionHistogram.WithLabelValues(ver, metrics.RetLabel(err)).Observe(time.Since(startTime).Seconds())
+	metrics.UpdateSelfVersionHistogram.WithLabelValues(metrics.RetLabel(err)).Observe(time.Since(startTime).Seconds())
 	return errors.Trace(err)
 }
 
@@ -232,7 +232,7 @@ func (s *schemaVersionSyncer) OwnerUpdateGlobalVersion(ctx context.Context, vers
 	// TODO: If the version is larger than the original global version, we need set the version.
 	// Otherwise, we'd better set the original global version.
 	err := PutKVToEtcd(ctx, s.etcdCli, putKeyRetryUnlimited, DDLGlobalSchemaVersion, ver)
-	metrics.OwnerHandleSyncerHistogram.WithLabelValues(metrics.OwnerUpdateGlobalVersion, ver, metrics.RetLabel(err)).Observe(time.Since(startTime).Seconds())
+	metrics.OwnerHandleSyncerHistogram.WithLabelValues(metrics.OwnerUpdateGlobalVersion, metrics.RetLabel(err)).Observe(time.Since(startTime).Seconds())
 	return errors.Trace(err)
 }
 
@@ -276,8 +276,7 @@ func (s *schemaVersionSyncer) MustGetGlobalVersion(ctx context.Context) (int64,
 	intervalCnt := int(time.Second / keyOpRetryInterval)
 
 	defer func() {
-		gVer := strconv.FormatInt(int64(ver), 10)
-		metrics.OwnerHandleSyncerHistogram.WithLabelValues(metrics.OwnerGetGlobalVersion, gVer, metrics.RetLabel(err)).Observe(time.Since(startTime).Seconds())
+		metrics.OwnerHandleSyncerHistogram.WithLabelValues(metrics.OwnerGetGlobalVersion, metrics.RetLabel(err)).Observe(time.Since(startTime).Seconds())
 	}()
 	for {
 		if err != nil {
@@ -325,8 +324,7 @@ func (s *schemaVersionSyncer) OwnerCheckAllVersions(ctx context.Context, latestV
 
 	var err error
 	defer func() {
-		ver := strconv.FormatInt(latestVer, 10)
-		metrics.OwnerHandleSyncerHistogram.WithLabelValues(metrics.OwnerGetGlobalVersion, ver, metrics.RetLabel(err)).Observe(time.Since(startTime).Seconds())
+		metrics.OwnerHandleSyncerHistogram.WithLabelValues(metrics.OwnerCheckAllVersions, metrics.RetLabel(err)).Observe(time.Since(startTime).Seconds())
 	}()
 	for {
 		if isContextDone(ctx) {
diff --git a/metrics/ddl.go b/metrics/ddl.go
index 9a646195fc487..b08911b693514 100644
--- a/metrics/ddl.go
+++ b/metrics/ddl.go
@@ -63,7 +63,7 @@ var (
 			Name:      "update_self_ver_duration_seconds",
 			Help:      "Bucketed histogram of processing time (s) of update self version",
 			Buckets:   prometheus.ExponentialBuckets(0.01, 2, 20),
-		}, []string{LblVersion, LblResult})
+		}, []string{LblResult})
 
 	OwnerUpdateGlobalVersion   = "update_global_version"
 	OwnerGetGlobalVersion      = "get_global_version"
@@ -75,7 +75,7 @@ var (
 			Name:      "owner_handle_syncer_duration_seconds",
 			Help:      "Bucketed histogram of processing time (s) of handle syncer",
 			Buckets:   prometheus.ExponentialBuckets(0.01, 2, 20),
-		}, []string{LblType, LblVersion, LblResult})
+		}, []string{LblType, LblResult})
 
 	// Metrics for ddl_worker.go.
 	WorkerAddDDLJob         = "add_job"
@@ -105,6 +105,5 @@ var (
 
 // Label constants.
 const (
-	LblAction  = "action"
-	LblVersion = "version"
+	LblAction = "action"
 )