diff --git a/pkg/metrics/datacoord_metrics.go b/pkg/metrics/datacoord_metrics.go
index 9bf656a1e3..f7d4ba2977 100644
--- a/pkg/metrics/datacoord_metrics.go
+++ b/pkg/metrics/datacoord_metrics.go
@@ -283,6 +283,7 @@ func RegisterDataCoord(registry *prometheus.Registry) {
 	registry.MustRegister(DataCoordSegmentBinLogFileCount)
 	registry.MustRegister(DataCoordDmlChannelNum)
 	registry.MustRegister(DataCoordCompactedSegmentSize)
+	registry.MustRegister(DataCoordCompactionTaskNum)
 	registry.MustRegister(DataCoordSizeStoredL0Segment)
 	registry.MustRegister(DataCoordRateStoredL0Segment)
 	registry.MustRegister(FlushedSegmentFileNum)