diff --git a/collection.go b/collection.go
index efb1600..6d0492a 100644
--- a/collection.go
+++ b/collection.go
@@ -93,6 +93,7 @@ func (coll *DataCollection) saveByMask(ctx context.Context) error {
 
 	span.SetAttributes(
 		attribute.String("table", tableName),
+		attribute.Int("field_amount", countFields),
 	)
 
 	for _, item := range coll.Items {