[receiver/mongodbreceiver] Fix index access count error collection on…

… a replica local database (#21116)

* remove local db collection for index access

.chloggen/mongodb-fix-index-access-on-local-error.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: mongodbreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fixes scraper error `Unauthorized` by not calling index stats on an internal local MongoDB database.
+
+# One or more tracking issues related to the change
+issues: [21114]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

receiver/mongodbreceiver/scraper.go

@@ -149,6 +149,9 @@ func (s *mongodbScraper) collectTopStats(ctx context.Context, now pcommon.Timest
 }
 
 func (s *mongodbScraper) collectIndexStats(ctx context.Context, now pcommon.Timestamp, databaseName string, collectionName string, errs *scrapererror.ScrapeErrors) {
+	if databaseName == "local" {
+		return
+	}
 	indexStats, err := s.client.IndexStats(ctx, databaseName, collectionName)
 	if err != nil {
 		errs.AddPartial(1, fmt.Errorf("failed to fetch index stats metrics: %w", err))