Fix duplicated events on VSM stage form

- Hide 'internal' events (used only for the default 7 stages)
- Prevent duplicates in StageEvents.events method

ee/app/serializers/analytics/cycle_analytics/configuration_entity.rb

@@ -11,7 +11,11 @@ module Analytics
       private
 
       def events
-        Gitlab::Analytics::CycleAnalytics::StageEvents.events.sort_by(&:name)
+        (stage_events.events - stage_events.internal_events).sort_by(&:name)
+      end
+
+      def stage_events
+        Gitlab::Analytics::CycleAnalytics::StageEvents
       end
     end
   end

ee/app/serializers/analytics/cycle_analytics/event_entity.rb

@@ -20,11 +20,17 @@ module Analytics
       end
 
       def allowed_end_events
-        pairing_rules.fetch(object, []).map(&:identifier)
+        pairing_rules.fetch(object, []).map do |event|
+          event.identifier unless stage_events.internal_events.include?(event)
+        end.compact
       end
 
       def pairing_rules
-        Gitlab::Analytics::CycleAnalytics::StageEvents.pairing_rules
+        stage_events.pairing_rules
+      end
+
+      def stage_events
+        Gitlab::Analytics::CycleAnalytics::StageEvents
       end
     end
   end

ee/changelogs/unreleased/212647-fix-duplicated-events-on-stage-form.yml

+---
+title: Fix duplicated events on Value Stream Analytics stage form
+merge_request: 29030
+author:
+type: fixed

ee/lib/ee/gitlab/analytics/cycle_analytics/stage_events.rb

@@ -133,7 +133,7 @@ module EE
             override :events
             def events
               strong_memoize(:events) do
-                super + EE_EVENTS
+                (super + EE_EVENTS).uniq
               end
             end
 

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

@@ -34,13 +34,15 @@ describe Analytics::CycleAnalytics::StagesController do
       expect(response_start_events).to eq(start_events)
     end
 
-    it 'returns correct event names' do
+    it 'does not include internal events' do
       subject
 
       response_event_names = json_response['events'].map { |s| s['name'] }
-      event_names = Gitlab::Analytics::CycleAnalytics::StageEvents.events.map(&:name)
+      event_names = Gitlab::Analytics::CycleAnalytics::StageEvents.events
+      internal_events = Gitlab::Analytics::CycleAnalytics::StageEvents.internal_events
+      expected_event_names = (event_names - internal_events).map(&:name)
 
-      expect(response_event_names).to eq(event_names.sort)
+      expect(response_event_names).to eq(expected_event_names.sort)
     end
 
     it 'succeeds for subgroups' do

ee/spec/controllers/groups/analytics/cycle_analytics/stages_controller_spec.rb

@@ -34,13 +34,15 @@ describe Groups::Analytics::CycleAnalytics::StagesController do
       expect(response_start_events).to eq(start_events)
     end
 
-    it 'returns correct event names' do
+    it 'does not include internal events' do
       subject
 
       response_event_names = json_response['events'].map { |s| s['name'] }
-      event_names = Gitlab::Analytics::CycleAnalytics::StageEvents.events.map(&:name).sort
+      event_names = Gitlab::Analytics::CycleAnalytics::StageEvents.events
+      internal_events = Gitlab::Analytics::CycleAnalytics::StageEvents.internal_events
+      expected_event_names = (event_names - internal_events).map(&:name)
 
-      expect(response_event_names).to eq(event_names)
+      expect(response_event_names).to eq(expected_event_names.sort)
     end
 
     it 'succeeds for subgroups' do

ee/spec/frontend/analytics/cycle_analytics/components/custom_stage_form_spec.js

@@ -306,7 +306,7 @@ describe('CustomStageForm', () => {
 
       expect(stopOptions.at(0).html()).toEqual('<option value="">Select stop event</option>');
 
-      selectDropdownOption(wrapper, sel.startEvent, startEventDropdownIndex - 1);
+      selectDropdownOption(wrapper, sel.startEvent, startEventDropdownIndex);
 
       return Vue.nextTick().then(() => {
         stopOptions = wrapper.find(sel.endEvent);

lib/gitlab/analytics/cycle_analytics/stage_events.rb

@@ -24,6 +24,13 @@ module Gitlab
 
         EVENTS = ENUM_MAPPING.keys.freeze
 
+        INTERNAL_EVENTS = [
+          StageEvents::CodeStageStart,
+          StageEvents::IssueStageEnd,
+          StageEvents::PlanStageStart,
+          StageEvents::ProductionStageEnd
+        ].freeze
+
         # Defines which start_event and end_event pairs are allowed
         PAIRING_RULES = {
           StageEvents::PlanStageStart => [
@@ -67,6 +74,11 @@ module Gitlab
         def self.enum_mapping
           ENUM_MAPPING
         end
+
+        # Events that are specific to the 7 default stages
+        def self.internal_events
+          INTERNAL_EVENTS
+        end
       end
     end
   end