Adjustments to compare caching

Removes an ineffective cache and extends the effective one.

Changelog: performance

config/feature_flags/development/api_caching_rate_limit_repository_compare.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/334264
 milestone: '14.1'
 type: development
 group: group::source code
-default_enabled: false
+default_enabled: true

config/feature_flags/development/api_caching_repository_compare.yml

----
-name: api_caching_repository_compare
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/64418
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/334264
-milestone: '14.1'
-type: development
-group: group::source code
-default_enabled: false

lib/api/repositories.rb

@@ -122,7 +122,7 @@ module API
       get ':id/repository/compare' do
         ff_enabled = Feature.enabled?(:api_caching_rate_limit_repository_compare, user_project, default_enabled: :yaml)
 
-        cache_action_if(ff_enabled, [user_project, :repository_compare, current_user, declared_params], expires_in: 30.seconds) do
+        cache_action_if(ff_enabled, [user_project, :repository_compare, current_user, declared_params], expires_in: 1.minute) do
           if params[:from_project_id].present?
             target_project = MergeRequestTargetProjectFinder
               .new(current_user: current_user, source_project: user_project, project_feature: :repository)
@@ -138,11 +138,7 @@ module API
           compare = CompareService.new(user_project, params[:to]).execute(target_project, params[:from], straight: params[:straight])
 
           if compare
-            if Feature.enabled?(:api_caching_repository_compare, user_project, default_enabled: :yaml)
-              present_cached compare, with: Entities::Compare, expires_in: 1.day, cache_context: nil
-            else
-              present compare, with: Entities::Compare
-            end
+            present compare, with: Entities::Compare
           else
             not_found!("Ref")
           end

spec/requests/api/repositories_spec.rb

@@ -488,17 +488,6 @@ RSpec.describe API::Repositories do
         let(:current_user) { nil }
       end
     end
-
-    context 'api_caching_repository_compare is disabled' do
-      before do
-        stub_feature_flags(api_caching_repository_compare: false)
-      end
-
-      it_behaves_like 'repository compare' do
-        let(:project) { create(:project, :public, :repository) }
-        let(:current_user) { nil }
-      end
-    end
   end
 
   describe 'GET /projects/:id/repository/contributors' do