Add endpoint for time summary to VSA

ee/app/controllers/analytics/cycle_analytics/summary_controller.rb

@@ -8,18 +8,23 @@ module Analytics
       check_feature_flag Gitlab::Analytics::CYCLE_ANALYTICS_FEATURE_FLAG
 
       before_action :load_group
+      before_action :authorize_access
       before_action :validate_params
 
       def show
-        return render_403 unless can?(current_user, :read_group_cycle_analytics, @group)
-
-        group_level = GroupLevel.new(group: @group, options: options(group_params))
-
         render json: group_level.summary
       end
 
+      def time_summary
+        render json: group_level.time_summary
+      end
+
       private
 
+      def group_level
+        @group_level ||= GroupLevel.new(group: @group, options: options(group_params))
+      end
+
       def group_params
         hash = { created_after: request_params.created_after, created_before: request_params.created_before }
         hash[:project_ids] = request_params.project_ids if request_params.project_ids.any?
@@ -42,6 +47,10 @@ module Analytics
       def allowed_params
         params.permit(:created_after, :created_before, project_ids: [])
       end
+
+      def authorize_access
+        return render_403 unless can?(current_user, :read_group_cycle_analytics, @group)
+      end
     end
   end
 end

ee/app/models/analytics/cycle_analytics/group_level.rb

@@ -15,8 +15,15 @@ module Analytics
       def summary
         @summary ||=
           Gitlab::Analytics::CycleAnalytics::Summary::Group::StageSummary
-            .new(group, options: options)
-            .data
+          .new(group, options: options)
+          .data
+      end
+
+      def time_summary
+        @time_summary ||=
+          Gitlab::Analytics::CycleAnalytics::GroupStageTimeSummary
+          .new(group, options: options)
+          .data
       end
 
       def permissions(*)

ee/config/routes/analytics.rb

@@ -14,6 +14,7 @@ namespace :analytics do
         end
       end
       resource :summary, controller: :summary, only: :show
+      get '/time_summary' => 'summary#time_summary'
     end
     get '/cycle_analytics', to: redirect('-/analytics/value_stream_analytics')
   end

ee/config/routes/group.rb

@@ -36,6 +36,7 @@ constraints(::Constraints::GroupUrlConstrainer.new) do
             end
           end
           resource :summary, controller: :summary, only: :show
+          get '/time_summary' => 'summary#time_summary'
         end
         get '/cycle_analytics', to: redirect('-/analytics/value_stream_analytics')
       end

ee/spec/controllers/analytics/cycle_analytics/summary_controller_spec.rb

@@ -15,9 +15,7 @@ describe Analytics::CycleAnalytics::SummaryController do
     sign_in(user)
   end
 
-  describe 'GET `show`' do
-    subject { get :show, params: params }
-
+  shared_examples 'summary endpoint' do
     it 'succeeds' do
       subject
 
@@ -46,4 +44,16 @@ describe Analytics::CycleAnalytics::SummaryController do
     include_examples 'cycle analytics data endpoint examples'
     include_examples 'group permission check on the controller level'
   end
+
+  describe 'GET "show"' do
+    subject { get :show, params: params }
+
+    it_behaves_like 'summary endpoint'
+  end
+
+  describe 'GET "time_summary"' do
+    subject { get :time_summary, params: params }
+
+    it_behaves_like 'summary endpoint'
+  end
 end

ee/spec/models/analytics/cycle_analytics/group_level_spec.rb

@@ -12,6 +12,10 @@ describe Analytics::CycleAnalytics::GroupLevel do
   let(:mr) { create_merge_request_closing_issue(user, project, issue, commit_message: "References #{issue.to_reference}") }
   let(:pipeline) { create(:ci_empty_pipeline, status: 'created', project: project, ref: mr.source_branch, sha: mr.source_branch_sha, head_pipeline_of: mr) }
 
+  around do |example|
+    Timecop.freeze { example.run }
+  end
+
   subject { described_class.new(group: group, options: { from: from_date, current_user: user }) }
 
   describe '#permissions' do
@@ -41,4 +45,22 @@ describe Analytics::CycleAnalytics::GroupLevel do
       expect(subject.summary.map { |summary| summary[:value] }).to contain_exactly('0.1', '1', '1')
     end
   end
+
+  describe '#time_summary' do
+    let(:issue) { create(:issue, project: project) }
+
+    before do
+      # lead_time: 1 day, cycle_time: 2 days
+
+      issue.update!(created_at: 5.days.ago)
+
+      issue.metrics.update!(first_mentioned_in_commit_at: 4.days.ago)
+
+      issue.update!(closed_at: 3.days.ago)
+    end
+
+    it 'returns medians for lead time and cycle type' do
+      expect(subject.time_summary.map { |summary| summary[:value] }).to contain_exactly('1.0', '2.0')
+    end
+  end
 end