diff --git a/changelogs/unreleased/instrument-merge-request-diff-load-commits.yml b/changelogs/unreleased/instrument-merge-request-diff-load-commits.yml
new file mode 100644
index 00000000000..916b182a48b
--- /dev/null
+++ b/changelogs/unreleased/instrument-merge-request-diff-load-commits.yml
@@ -0,0 +1,4 @@
+---
+title: Instrument MergeRequestDiff#load_commits
+merge_request:
+author:
diff --git a/config/initializers/8_metrics.rb b/config/initializers/8_metrics.rb
index 5e0eefdb154..508b886d6a0 100644
--- a/config/initializers/8_metrics.rb
+++ b/config/initializers/8_metrics.rb
@@ -113,6 +113,9 @@ def instrument_classes(instrumentation)
 
   # This is a Rails scope so we have to instrument it manually.
   instrumentation.instrument_method(Project, :visible_to_user)
+
+  # Needed for https://gitlab.com/gitlab-org/gitlab-ce/issues/30224#note_32306159
+  instrumentation.instrument_instance_method(MergeRequestDiff, :load_commits)
 end
 # rubocop:enable Metrics/AbcSize
 
diff --git a/spec/initializers/8_metrics_spec.rb b/spec/initializers/8_metrics_spec.rb
index 570754621f3..a507d7f7f2b 100644
--- a/spec/initializers/8_metrics_spec.rb
+++ b/spec/initializers/8_metrics_spec.rb
@@ -7,6 +7,7 @@ describe 'instrument_classes', lib: true do
   before do
     allow(config).to receive(:instrument_method)
     allow(config).to receive(:instrument_methods)
+    allow(config).to receive(:instrument_instance_method)
     allow(config).to receive(:instrument_instance_methods)
   end