Hide N+1 query behind intended feature flag

app/graphql/types/alert_management/alert_type.rb

@@ -88,6 +88,12 @@ module Types
             [Types::UserType],
             null: true,
             description: 'Assignees of the alert'
+
+      def assignees
+        return User.none unless Feature.enabled?(:alert_assignee, object.project)
+
+        object.assignees
+      end
     end
   end
 end

spec/requests/api/graphql/project/alert_management/alerts_spec.rb

@@ -137,5 +137,18 @@ describe 'getting Alert Management Alerts' do
         end
       end
     end
+
+    context 'with alert_assignee flag disabled' do
+      before do
+        stub_feature_flags(alert_assignee: false)
+        project.add_developer(current_user)
+
+        post_graphql(query, current_user: current_user)
+      end
+
+      it 'excludes assignees' do
+        expect(alerts.first['assignees']).to be_empty
+      end
+    end
   end
 end