diff --git a/server/etcdserver/txn/metrics.go b/server/etcdserver/txn/metrics.go
index 1763f2a75c8..af88257045b 100644
--- a/server/etcdserver/txn/metrics.go
+++ b/server/etcdserver/txn/metrics.go
@@ -43,21 +43,21 @@ var (
 		Namespace: "etcd",
 		Subsystem: "server",
 		Name:      "range_duration_seconds",
-		Help:      "The latency distributions of v2 apply called by backend.",
+		Help:      "The latency distributions of txn.Range",
 
 		// lowest bucket start of upper bound 0.0001 sec (0.1 ms) with factor 2
 		// highest bucket start of 0.0001 sec * 2^19 == 52.4288 sec
 		Buckets: prometheus.ExponentialBuckets(0.0001, 2, 20),
 	},
-		[]string{"version", "op", "success"})
+		[]string{"op", "success"})
 )
 
 func ApplySecObserve(version, op string, success bool, latency time.Duration) {
 	applySec.WithLabelValues(version, op, strconv.FormatBool(success)).Observe(float64(latency.Microseconds()) / 1000000.0)
 }
 
-func RangeSecObserve(version, op string, success bool, latency time.Duration) {
-	rangeSec.WithLabelValues(version, op, strconv.FormatBool(success)).Observe(float64(latency.Microseconds()) / 1000000.0)
+func RangeSecObserve(op string, success bool, latency time.Duration) {
+	rangeSec.WithLabelValues(op, strconv.FormatBool(success)).Observe(float64(latency.Microseconds()) / 1000000.0)
 }
 
 func init() {
diff --git a/server/etcdserver/txn/txn.go b/server/etcdserver/txn/txn.go
index fdda188523b..177c1756a97 100644
--- a/server/etcdserver/txn/txn.go
+++ b/server/etcdserver/txn/txn.go
@@ -144,11 +144,9 @@ func Range(ctx context.Context, lg *zap.Logger, kv mvcc.KV, r *pb.RangeRequest)
 		ctx = context.WithValue(ctx, traceutil.TraceKey{}, trace)
 	}
 	op := "range"
-	stringer := &pb.InternalRaftStringer{Request: &pb.InternalRaftRequest{Range: r}}
 	defer func(start time.Time) {
 		success := err == nil
-		RangeSecObserve(v3Version, op, success, time.Since(start))
-		WarnOfExpensiveRequest(lg, DefaultRangeWarningApplyDuration, start, stringer, nil, nil)
+		RangeSecObserve(op, success, time.Since(start))
 	}(time.Now())
 	txnRead := kv.Read(mvcc.ConcurrentReadTxMode, trace)
 	defer txnRead.End()