diff --git a/orca/call_metrics.go b/orca/call_metrics.go
index 798fe8cf1209..157dad49c657 100644
--- a/orca/call_metrics.go
+++ b/orca/call_metrics.go
@@ -91,7 +91,7 @@ func (rw *recorderWrapper) recorder() CallMetricsRecorder {
 func (rw *recorderWrapper) setTrailerMetadata(ctx context.Context) {
 	var sm *ServerMetrics
 	if rw.smp != nil {
-		sm = copyServerMetrics(rw.smp.ServerMetrics())
+		sm = rw.smp.ServerMetrics()
 		sm.merge(rw.r.ServerMetrics())
 	} else {
 		sm = rw.r.ServerMetrics()
diff --git a/orca/server_metrics.go b/orca/server_metrics.go
index 62e4a435aaae..67d1fa9d7f2b 100644
--- a/orca/server_metrics.go
+++ b/orca/server_metrics.go
@@ -142,7 +142,7 @@ type ServerMetricsRecorder interface {
 }
 
 type serverMetricsRecorder struct {
-	state atomic.Pointer[ServerMetrics] // latest snapshot of the current metrics
+	state atomic.Pointer[ServerMetrics] // the current metrics
 }
 
 // NewServerMetricsRecorder returns an in-memory store for ServerMetrics and
@@ -167,9 +167,9 @@ func newServerMetricsRecorder() *serverMetricsRecorder {
 	return s
 }
 
-// ServerMetrics returns a pointer to the latest snapshot of ServerMetrics.
+// ServerMetrics returns a copy of the current ServerMetrics.
 func (s *serverMetricsRecorder) ServerMetrics() *ServerMetrics {
-	return s.state.Load()
+	return copyServerMetrics(s.state.Load())
 }
 
 func copyMap(m map[string]float64) map[string]float64 {