diff --git a/internal/datacoord/meta.go b/internal/datacoord/meta.go
index 156908ff3d..822bc9b049 100644
--- a/internal/datacoord/meta.go
+++ b/internal/datacoord/meta.go
@@ -466,11 +466,13 @@ func (m *meta) GetQuotaInfo() *metricsinfo.DataCoordQuotaMetrics {
 	return info
 }
 
-// GetCollectionIndexFilesSize returns the total index files size of all segment for each collection.
-func (m *meta) GetCollectionIndexFilesSize() uint64 {
+// SetStoredIndexFileSizeMetric returns the total index files size of all segment for each collection.
+func (m *meta) SetStoredIndexFileSizeMetric() uint64 {
 	m.RLock()
 	defer m.RUnlock()
 	var total uint64
+
+	metrics.DataCoordStoredIndexFilesSize.Reset()
 	for _, segmentIdx := range m.indexMeta.GetAllSegIndexes() {
 		coll, ok := m.collections[segmentIdx.CollectionID]
 		if ok {
diff --git a/internal/datacoord/meta_test.go b/internal/datacoord/meta_test.go
index 2def53a5cc..6d5fb2c39e 100644
--- a/internal/datacoord/meta_test.go
+++ b/internal/datacoord/meta_test.go
@@ -604,7 +604,7 @@ func TestMeta_Basic(t *testing.T) {
 
 	t.Run("Test GetCollectionBinlogSize", func(t *testing.T) {
 		meta := createMeta(&datacoord.Catalog{}, withIndexMeta(createIndexMeta(&datacoord.Catalog{})))
-		ret := meta.GetCollectionIndexFilesSize()
+		ret := meta.SetStoredIndexFileSizeMetric()
 		assert.Equal(t, uint64(0), ret)
 
 		meta.collections = map[UniqueID]*collectionInfo{
@@ -613,7 +613,7 @@ func TestMeta_Basic(t *testing.T) {
 				DatabaseName: "db",
 			},
 		}
-		ret = meta.GetCollectionIndexFilesSize()
+		ret = meta.SetStoredIndexFileSizeMetric()
 		assert.Equal(t, uint64(11), ret)
 	})
 
diff --git a/internal/datacoord/metrics_info.go b/internal/datacoord/metrics_info.go
index 52d4dc65ac..03f0b9e552 100644
--- a/internal/datacoord/metrics_info.go
+++ b/internal/datacoord/metrics_info.go
@@ -40,7 +40,7 @@ import (
 func (s *Server) getQuotaMetrics() *metricsinfo.DataCoordQuotaMetrics {
 	info := s.meta.GetQuotaInfo()
 	// Just generate the metrics data regularly
-	_ = s.meta.GetCollectionIndexFilesSize()
+	_ = s.meta.SetStoredIndexFileSizeMetric()
 	return info
 }