align with the comments

config/initializers/8_metrics.rb

@@ -116,9 +116,6 @@ def instrument_classes(instrumentation)
   # Needed for https://gitlab.com/gitlab-org/gitlab-ce/issues/30224#note_32306159
   instrumentation.instrument_instance_method(MergeRequestDiff, :load_commits)
-
-  # Needed for https://gitlab.com/gitlab-org/gitlab-ce/issues/36061
-  instrumentation.instrument_instance_method(MergeRequest, :fetch_ref!)
 end
 # rubocop:enable Metrics/AbcSize

spec/models/merge_request_spec.rb

@@ -1756,7 +1756,7 @@ describe MergeRequest do
   end
   describe '#fetch_ref!' do
-    it 'fetch the ref correctly' do
+    it 'fetches the ref correctly' do
       expect { subject.target_project.repository.delete_refs(subject.ref_path) }.not_to raise_error
       subject.fetch_ref!