diff --git a/internal/git/localrepo/tag.go b/internal/git/localrepo/tag.go
index 59b8da8d8d9eef7d14fa077b92b681aa7a11efbc..88091698c3c96b074a6facc9eecb0680a76feb97 100644
--- a/internal/git/localrepo/tag.go
+++ b/internal/git/localrepo/tag.go
@@ -76,6 +76,12 @@ func (e MktagError) Error() string {
 	return fmt.Sprintf("Could not update refs/tags/%s. Please refresh and try again.", e.tagName)
 }
 
+// DetailedError provides a more detailed error message that includes the `stderr` content.
+// Once the backwards compatibility requirement is removed, this can be moved to the Error() function.
+func (e MktagError) DetailedError() string {
+	return fmt.Sprintf("mktag failed for refs/tags/%s, stderr: %q", e.tagName, e.stderr)
+}
+
 // WriteTag writes a tag to the repository's object database with
 // git-mktag and returns its object ID.
 //
diff --git a/internal/gitaly/service/operations/tags.go b/internal/gitaly/service/operations/tags.go
index 604299bc241f7e7850f6ddc9894b0fea4678b018..89c45a00a8dd390f69851965d341d8c2dfbbddd4 100644
--- a/internal/gitaly/service/operations/tags.go
+++ b/internal/gitaly/service/operations/tags.go
@@ -290,8 +290,12 @@ func (s *Server) createTag(
 				return nil, "", structerr.NewInvalidArgument("formatting tag: %w", formatTagErr)
 			}
 
-			var MktagError localrepo.MktagError
-			if errors.As(err, &MktagError) {
+			var mktagError localrepo.MktagError
+			if errors.As(err, &mktagError) {
+				// TODO: can be delete once localrepo.MktagError.Error()
+				// backwards compatibility requirement is removed.
+				s.logger.WithField("error", mktagError.DetailedError()).Error("making tag failed")
+
 				return nil, "", structerr.NewNotFound("Gitlab::Git::CommitError: %s", err.Error())
 			}
 			return nil, "", structerr.NewInternal("writing tag: %w", err)