diff --git a/src/aggregator/aggregator/aggregator.go b/src/aggregator/aggregator/aggregator.go
index e510a57a3d..0f8d4cd644 100644
--- a/src/aggregator/aggregator/aggregator.go
+++ b/src/aggregator/aggregator/aggregator.go
@@ -183,7 +183,7 @@ func (agg *aggregator) AddUntimed(
 	metric unaggregated.MetricUnion,
 	metadatas metadata.StagedMetadatas,
 ) error {
-	callStart := agg.nowFn()
+	sw := agg.metrics.addUntimed.SuccessLatencyStopwatch()
 	if err := agg.checkMetricType(metric); err != nil {
 		agg.metrics.addUntimed.ReportError(err)
 		return err
@@ -197,7 +197,8 @@ func (agg *aggregator) AddUntimed(
 		agg.metrics.addUntimed.ReportError(err)
 		return err
 	}
-	agg.metrics.addUntimed.ReportSuccess(agg.nowFn().Sub(callStart))
+	agg.metrics.addUntimed.ReportSuccess()
+	sw.Stop()
 	return nil
 }
 
@@ -205,7 +206,7 @@ func (agg *aggregator) AddTimed(
 	metric aggregated.Metric,
 	metadata metadata.TimedMetadata,
 ) error {
-	callStart := agg.nowFn()
+	sw := agg.metrics.addTimed.SuccessLatencyStopwatch()
 	agg.metrics.timed.Inc(1)
 	shard, err := agg.shardFor(metric.ID)
 	if err != nil {
@@ -216,7 +217,8 @@ func (agg *aggregator) AddTimed(
 		agg.metrics.addTimed.ReportError(err)
 		return err
 	}
-	agg.metrics.addTimed.ReportSuccess(agg.nowFn().Sub(callStart))
+	agg.metrics.addTimed.ReportSuccess()
+	sw.Stop()
 	return nil
 }
 
@@ -224,7 +226,7 @@ func (agg *aggregator) AddTimedWithStagedMetadatas(
 	metric aggregated.Metric,
 	metas metadata.StagedMetadatas,
 ) error {
-	callStart := agg.nowFn()
+	sw := agg.metrics.addTimed.SuccessLatencyStopwatch()
 	agg.metrics.timed.Inc(1)
 	shard, err := agg.shardFor(metric.ID)
 	if err != nil {
@@ -235,7 +237,8 @@ func (agg *aggregator) AddTimedWithStagedMetadatas(
 		agg.metrics.addTimed.ReportError(err)
 		return err
 	}
-	agg.metrics.addTimed.ReportSuccess(agg.nowFn().Sub(callStart))
+	agg.metrics.addTimed.ReportSuccess()
+	sw.Stop()
 	return nil
 }
 
@@ -243,7 +246,7 @@ func (agg *aggregator) AddForwarded(
 	metric aggregated.ForwardedMetric,
 	metadata metadata.ForwardMetadata,
 ) error {
-	callStart := agg.nowFn()
+	sw := agg.metrics.addForwarded.SuccessLatencyStopwatch()
 	agg.metrics.forwarded.Inc(1)
 	shard, err := agg.shardFor(metric.ID)
 	if err != nil {
@@ -255,7 +258,8 @@ func (agg *aggregator) AddForwarded(
 		return err
 	}
 	callEnd := agg.nowFn()
-	agg.metrics.addForwarded.ReportSuccess(callEnd.Sub(callStart))
+	agg.metrics.addForwarded.ReportSuccess()
+	sw.Stop()
 	forwardingDelay := time.Duration(callEnd.UnixNano() - metric.TimeNanos)
 	agg.metrics.addForwarded.ReportForwardingLatency(
 		metadata.StoragePolicy.Resolution().Window,
@@ -269,7 +273,7 @@ func (agg *aggregator) AddPassthrough(
 	metric aggregated.Metric,
 	storagePolicy policy.StoragePolicy,
 ) error {
-	callStart := agg.nowFn()
+	sw := agg.metrics.addPassthrough.SuccessLatencyStopwatch()
 	agg.metrics.passthrough.Inc(1)
 
 	if agg.electionManager.ElectionState() == FollowerState {
@@ -298,7 +302,8 @@ func (agg *aggregator) AddPassthrough(
 		agg.metrics.addPassthrough.ReportError(err)
 		return err
 	}
-	agg.metrics.addPassthrough.ReportSuccess(agg.nowFn().Sub(callStart))
+	agg.metrics.addPassthrough.ReportSuccess()
+	sw.Stop()
 	return nil
 }
 
@@ -758,9 +763,12 @@ func newAggregatorAddMetricMetrics(
 	}
 }
 
-func (m *aggregatorAddMetricMetrics) ReportSuccess(d time.Duration) {
+func (m *aggregatorAddMetricMetrics) SuccessLatencyStopwatch() tally.Stopwatch {
+	return m.successLatency.Start()
+}
+
+func (m *aggregatorAddMetricMetrics) ReportSuccess() {
 	m.success.Inc(1)
-	m.successLatency.Record(d)
 }
 
 func (m *aggregatorAddMetricMetrics) ReportError(err error) {
diff --git a/src/aggregator/aggregator/aggregator_test.go b/src/aggregator/aggregator/aggregator_test.go
index 217c05ffa1..fd8f53f668 100644
--- a/src/aggregator/aggregator/aggregator_test.go
+++ b/src/aggregator/aggregator/aggregator_test.go
@@ -946,8 +946,9 @@ func TestAggregatorOwnedShards(t *testing.T) {
 
 func TestAggregatorAddMetricMetrics(t *testing.T) {
 	s := tally.NewTestScope("testScope", nil)
-	m := newAggregatorAddUntimedMetrics(s, instrument.TimerOptions{})
-	m.ReportSuccess(time.Second)
+	m := newAggregatorAddUntimedMetrics(s, instrument.TimerOptions{StandardSampleRate: 0.001})
+	m.ReportSuccess()
+	m.SuccessLatencyStopwatch().Stop()
 	m.ReportError(errInvalidMetricType)
 	m.ReportError(errShardNotOwned)
 	m.ReportError(errAggregatorShardNotWriteable)
@@ -980,9 +981,8 @@ func TestAggregatorAddMetricMetrics(t *testing.T) {
 	for _, id := range []string{
 		"testScope.success-latency+",
 	} {
-		ti, exists := timers[id]
+		_, exists := timers[id]
 		require.True(t, exists)
-		require.Equal(t, []time.Duration{time.Second}, ti.Values())
 	}
 
 	// Validate we do not have any gauges.
@@ -992,7 +992,8 @@ func TestAggregatorAddMetricMetrics(t *testing.T) {
 func TestAggregatorAddTimedMetrics(t *testing.T) {
 	s := tally.NewTestScope("testScope", nil)
 	m := newAggregatorAddTimedMetrics(s, instrument.TimerOptions{})
-	m.ReportSuccess(time.Second)
+	m.ReportSuccess()
+	m.SuccessLatencyStopwatch().Stop()
 	m.ReportError(errShardNotOwned)
 	m.ReportError(errAggregatorShardNotWriteable)
 	m.ReportError(errWriteNewMetricRateLimitExceeded)
@@ -1027,9 +1028,8 @@ func TestAggregatorAddTimedMetrics(t *testing.T) {
 	for _, id := range []string{
 		"testScope.success-latency+",
 	} {
-		ti, exists := timers[id]
+		_, exists := timers[id]
 		require.True(t, exists)
-		require.Equal(t, []time.Duration{time.Second}, ti.Values())
 	}
 
 	// Validate we do not have any gauges.