Enable CI minutes update to run idempotently

Add a feature flag to control the new behavior.
Pass build_id to the worker class to track CI
minutes idempotently for jobs in new deployment.

ee/app/services/ci/minutes/update_build_minutes_service.rb

@@ -14,14 +14,14 @@ module Ci
 
         return unless consumption > 0
 
-        update_minutes(consumption)
+        update_minutes(consumption, build)
         compare_with_live_consumption(build, consumption)
       end
 
       private
 
-      def update_minutes(consumption)
-        ::Ci::Minutes::UpdateProjectAndNamespaceUsageWorker.perform_async(consumption, project.id, namespace.id)
+      def update_minutes(consumption, build)
+        ::Ci::Minutes::UpdateProjectAndNamespaceUsageWorker.perform_async(consumption, project.id, namespace.id, build.id)
       end
 
       def compare_with_live_consumption(build, consumption)

ee/app/services/ci/minutes/update_project_and_namespace_usage_service.rb

@@ -22,7 +22,7 @@ module Ci
         # TODO: fix this condition after the next deployment when `build_id`
         # is made a mandatory argument.
         # https://gitlab.com/gitlab-org/gitlab/-/issues/331785
-        if @build_id
+        if @build_id && idempotent_consumption_enabled?
           ensure_idempotency { track_usage_of_monthly_minutes(consumption) }
         else
           track_usage_of_monthly_minutes(consumption)
@@ -103,7 +103,10 @@ module Ci
       # Ensure we only add the CI minutes consumption once for the given build
       # even if the worker is retried.
       def ensure_idempotency
-        return if already_completed?
+        if already_completed?
+          ::Gitlab::AppJsonLogger.info(event: 'ci_minutes_consumption_already_updated', build_id: @build_id)
+          return
+        end
 
         yield
 
@@ -121,6 +124,15 @@ module Ci
           redis.exists(idempotency_cache_key)
         end
       end
+
+      # When running this worker the project might have been deleted.
+      # In this case we consider the feature flag disabled for backward
+      # compatibility.
+      def idempotent_consumption_enabled?
+        return false unless @project
+
+        Feature.enabled?(:idempotent_ci_minutes_consumption, @project, default_enabled: :yaml)
+      end
     end
   end
 end

ee/config/feature_flags/development/idempotent_ci_minutes_consumption.yml

+---
+name: idempotent_ci_minutes_consumption
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/69994
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/340517
+milestone: '14.4'
+type: development
+group: group::pipeline execution
+default_enabled: false

ee/spec/services/ci/minutes/update_project_and_namespace_usage_service_spec.rb

@@ -170,6 +170,23 @@ RSpec.describe Ci::Minutes::UpdateProjectAndNamespaceUsageService do
           it_behaves_like 'does not update monthly consumption'
           it_behaves_like 'updates legacy consumption' # not idempotent / to be removed
 
+          it 'logs the event' do
+            expect(::Gitlab::AppJsonLogger)
+              .to receive(:info)
+              .with(event: 'ci_minutes_consumption_already_updated', build_id: build.id)
+              .and_call_original
+
+            subject
+          end
+
+          context 'when feature flag idempotent_ci_minutes_consumption is disabled' do
+            before do
+              stub_feature_flags(idempotent_ci_minutes_consumption: false)
+            end
+
+            it_behaves_like 'updates monthly consumption'
+          end
+
           context 'when build_id is not provided as parameter' do
             let(:service) { described_class.new(project.id, namespace.id) }