Add indexCountLabel for metric QueryNodeNumEntities (#21081)

Signed-off-by: Nzhenshan.cao <zhenshan.cao@zilliz.com>
Signed-off-by: Nzhenshan.cao <zhenshan.cao@zilliz.com>

internal/metrics/querynode_metrics.go

@@ -323,6 +323,7 @@ var (
 			collectionIDLabelName,
 			partitionIDLabelName,
 			segmentStateLabelName,
+			indexCountLabelName,
 		})
 
 	// QueryNodeConsumeCounter counts the bytes QueryNode consumed from message storage.

internal/querynode/meta_replica.go

@@ -634,6 +634,7 @@ func (replica *metaReplica) addSegmentPrivate(segment *Segment) error {
 			fmt.Sprint(segment.collectionID),
 			fmt.Sprint(segment.partitionID),
 			segType.String(),
+			fmt.Sprint(segment.indexedFieldInfos.Len()),
 		).Add(float64(rowCount))
 	}
 	return nil
@@ -742,6 +743,7 @@ func (replica *metaReplica) removeSegmentPrivate(segmentID UniqueID, segType seg
 				fmt.Sprint(segment.collectionID),
 				fmt.Sprint(segment.partitionID),
 				segType.String(),
+				fmt.Sprint(segment.indexedFieldInfos.Len()),
 			).Sub(float64(rowCount))
 		}
 	}

internal/querynode/segment.go

@@ -713,6 +713,7 @@ func (s *Segment) segmentInsert(offset int64, entityIDs []UniqueID, timestamps [
 		fmt.Sprint(s.collectionID),
 		fmt.Sprint(s.partitionID),
 		s.segmentType.String(),
+		fmt.Sprint(0),
 	).Add(float64(numOfRow))
 	s.setRecentlyModified(true)
 	return nil