Add UI to disable Service templates

When a instance level integrations is enabled, we need to
disable to corresponding service template

app/controllers/admin/services_controller.rb

@@ -4,16 +4,18 @@ class Admin::ServicesController < Admin::ApplicationController
   include ServiceParams
 
   before_action :service, only: [:edit, :update]
+  before_action :whitelist_query_limiting, only: [:index]
   before_action only: :edit do
     push_frontend_feature_flag(:integration_form_refactor)
   end
 
   def index
     @services = Service.find_or_create_templates.sort_by(&:title)
+    @existing_instance_types = Service.instances.pluck(:type) # rubocop: disable CodeReuse/ActiveRecord
   end
 
   def edit
-    unless service.present?
+    if service.nil? || Service.instance_exists_for?(service.type)
       redirect_to admin_application_settings_services_path,
         alert: "Service is unknown or it doesn't exist"
     end
@@ -37,4 +39,8 @@ class Admin::ServicesController < Admin::ApplicationController
     @service ||= Service.find_by(id: params[:id], template: true)
   end
   # rubocop: enable CodeReuse/ActiveRecord
+
+  def whitelist_query_limiting
+    Gitlab::QueryLimiting.whitelist('https://gitlab.com/gitlab-org/gitlab/-/issues/220357')
+  end
 end

app/models/service.rb

@@ -357,6 +357,10 @@ class Service < ApplicationRecord
     service
   end
 
+  def self.instance_exists_for?(type)
+    exists?(instance: true, type: type)
+  end
+
   # override if needed
   def supports_data_fields?
     false

app/views/admin/services/index.html.haml

@@ -11,13 +11,24 @@
         %th Description
         %th Last edit
     - @services.each do |service|
-      %tr
-        %td
-          = boolean_to_icon service.activated?
-        %td
-          = link_to edit_admin_application_settings_service_path(service.id) do
-            %strong= service.title
-        %td
-          = service.description
-        %td.light
-          = time_ago_with_tooltip service.updated_at
+      - if service.type.in?(@existing_instance_types)
+        %tr
+          %td
+          %td
+            = link_to edit_admin_application_settings_integration_path(service.to_param), class: 'gl-text-blue-300!' do
+              %strong.has-tooltip{ title: s_('AdminSettings|Moved to integrations'), data: { container: 'body' } }
+                = service.title
+          %td.gl-cursor-default.gl-text-gray-600
+            = service.description
+          %td
+      - else
+        %tr
+          %td
+            = boolean_to_icon service.activated?
+          %td
+            = link_to edit_admin_application_settings_service_path(service.id) do
+              %strong= service.title
+          %td
+            = service.description
+          %td.light
+            = time_ago_with_tooltip service.updated_at

changelogs/unreleased/218257-service-templates-page-disable-service-template-when-instance-leve.yml

+---
+title: Add UI to disable Service template when instance-level integration is active
+merge_request: 33490
+author:
+type: changed

locale/gitlab.pot

@@ -1631,6 +1631,9 @@ msgstr ""
 msgid "AdminSettings|Integrations configured here will automatically apply to all projects on this instance."
 msgstr ""
 
+msgid "AdminSettings|Moved to integrations"
+msgstr ""
+
 msgid "AdminSettings|No required pipeline"
 msgstr ""
 

spec/controllers/admin/services_controller_spec.rb

@@ -10,7 +10,7 @@ RSpec.describe Admin::ServicesController do
   end
 
   describe 'GET #edit' do
-    let!(:service) do
+    let(:service) do
       create(:jira_service, :template)
     end
 
@@ -19,6 +19,26 @@ RSpec.describe Admin::ServicesController do
 
       expect(response).to have_gitlab_http_status(:ok)
     end
+
+    context 'when integration does not exists' do
+      it 'redirects to the admin application integration page' do
+        get :edit, params: { id: 'invalid' }
+
+        expect(response).to redirect_to(admin_application_settings_services_path)
+      end
+    end
+
+    context 'when instance integration exists' do
+      before do
+        create(:jira_service, :instance)
+      end
+
+      it 'redirects to the admin application integration page' do
+        get :edit, params: { id: service.id }
+
+        expect(response).to redirect_to(admin_application_settings_services_path)
+      end
+    end
   end
 
   describe "#update" do

spec/features/admin/services/admin_visits_service_templates_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Admin visits service templates' do
+  let(:admin) { create(:user, :admin) }
+  let(:slack_service) { Service.templates.find { |s| s.type == 'SlackService' } }
+
+  before do
+    sign_in(admin)
+
+    visit(admin_application_settings_services_path)
+  end
+
+  context 'without instance-level integration' do
+    it 'shows a link to service template' do
+      expect(page).to have_link('Slack', href: edit_admin_application_settings_service_path(slack_service.id))
+      expect(page).not_to have_link('Slack', href: edit_admin_application_settings_integration_path(slack_service))
+    end
+  end
+
+  context 'with instance-level integration' do
+    let_it_be(:slack_instance_integration) { create(:slack_service, instance: true, project: nil) }
+
+    it 'shows a link to instance-level integration' do
+      expect(page).not_to have_link('Slack', href: edit_admin_application_settings_service_path(slack_service.id))
+      expect(page).to have_link('Slack', href: edit_admin_application_settings_integration_path(slack_service))
+    end
+  end
+end

spec/models/service_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Service do
+RSpec.describe Service do
   describe "Associations" do
     it { is_expected.to belong_to :project }
     it { is_expected.to have_one :service_hook }