diff --git a/mvcc/metrics.go b/mvcc/metrics.go
index baaf61094..42932c40d 100644
--- a/mvcc/metrics.go
+++ b/mvcc/metrics.go
@@ -297,11 +297,11 @@ var (
 	reportCompactRevMu sync.RWMutex
 	reportCompactRev   = func() float64 { return 0 }
 
-	putSizeGauge = prometheus.NewGauge(
+	totalPutSizeGauge = prometheus.NewGauge(
 		prometheus.GaugeOpts{
-			Namespace: "etcd",
+			Namespace: "etcd_debugging",
 			Subsystem: "mvcc",
-			Name:      "put_size_in_bytes",
+			Name:      "total_put_size_in_bytes",
 			Help:      "The total size of put kv pairs seen by this member.",
 		})
 )
@@ -333,7 +333,7 @@ func init() {
 	prometheus.MustRegister(hashRevSec)
 	prometheus.MustRegister(currentRev)
 	prometheus.MustRegister(compactRev)
-	prometheus.MustRegister(putSizeGauge)
+	prometheus.MustRegister(totalPutSizeGauge)
 }
 
 // ReportEventReceived reports that an event is received.
diff --git a/mvcc/metrics_txn.go b/mvcc/metrics_txn.go
index 2f2c40514..17f1b31ca 100644
--- a/mvcc/metrics_txn.go
+++ b/mvcc/metrics_txn.go
@@ -63,7 +63,7 @@ func (tw *metricsTxnWrite) End() {
 	puts := float64(tw.puts)
 	putCounter.Add(puts)
 	putCounterDebug.Add(puts) // TODO: remove in 3.5 release
-	putSizeGauge.Add(float64(tw.putSize))
+	totalPutSizeGauge.Add(float64(tw.putSize))
 
 	deletes := float64(tw.deletes)
 	deleteCounter.Add(deletes)