Add template repository usage to the usage ping

changelogs/unreleased/7597-add-template-repository-usage-to-the-usage-ping.yml

+---
+title: Add template repository usage to the usage ping
+merge_request: 20126
+author: minghuan lei
+type: changed

ee/app/models/ee/project.rb

@@ -144,6 +144,8 @@ module EE
       scope :with_slack_slash_commands_service, -> { joins(:slack_slash_commands_service) }
       scope :with_prometheus_service, -> { joins(:prometheus_service) }
       scope :aimed_for_deletion, -> (date) { where('marked_for_deletion_at <= ?', date).without_deleted }
+      scope :with_repos_templates, -> { where(namespace_id: ::Gitlab::CurrentSettings.current_application_settings.custom_project_templates_group_id) }
+      scope :with_groups_level_repos_templates, -> { joins("INNER JOIN namespaces ON projects.namespace_id = namespaces.custom_project_templates_group_id") }
 
       delegate :shared_runners_minutes, :shared_runners_seconds, :shared_runners_seconds_last_reset,
         to: :statistics, allow_nil: true

ee/lib/ee/gitlab/usage_data.rb

@@ -138,7 +138,8 @@ module EE
                                          projects_with_packages: count(::Packages::Package.select('distinct project_id')),
                                          projects_with_prometheus_alerts: count(PrometheusAlert.distinct_projects),
                                          projects_with_tracing_enabled: count(ProjectTracingSetting),
-                                         projects_with_alerts_service_enabled: count(AlertsService.active)
+                                         projects_with_alerts_service_enabled: count(AlertsService.active),
+                                         template_repositories:  count(::Project.with_repos_templates) + count(::Project.with_groups_level_repos_templates)
                                        },
                                        service_desk_counts,
                                        security_products_usage,

ee/spec/lib/gitlab/usage_data_spec.rb

@@ -93,6 +93,7 @@ describe Gitlab::UsageData do
         design_management_designs_delete
         user_preferences_group_overview_details
         user_preferences_group_overview_security_dashboard
+        template_repositories
       ))
 
       expect(count_data[:projects_with_prometheus_alerts]).to eq(2)

ee/spec/models/project_spec.rb

@@ -2352,4 +2352,35 @@ describe Project do
       end
     end
   end
+
+  describe 'caculate template repositories' do
+    let(:group1) { create(:group) }
+    let(:group2) { create(:group) }
+    let(:group2_sub1) { create(:group, parent: group2) }
+    let(:group2_sub2) { create(:group, parent: group2) }
+
+    before do
+      stub_ee_application_setting(custom_project_templates_group_id: group2.id)
+      group2.update(custom_project_templates_group_id: group2_sub2.id)
+      create(:project, group: group1)
+
+      2.times do
+        create(:project, group: group2)
+      end
+      3.times do
+        create(:project, group: group2_sub1)
+      end
+      4.times do
+        create(:project, group: group2_sub2)
+      end
+    end
+
+    it 'counts instance level templates' do
+      expect(described_class.with_repos_templates.count).to eq(2)
+    end
+
+    it 'counts group level templates' do
+      expect(described_class.with_groups_level_repos_templates.count).to eq(4)
+    end
+  end
 end