Move the Generic Alerts endpoint to the Core

Moved dependencies:

* `AlertsService`
* `AlertsServiceData`
* `Alerting::NotifyService`
* `Alerting::NotificationsController`
* `alerts_service` factory
* `alerting/notify` route

app/models/project.rb

@@ -138,6 +138,7 @@ class Project < ApplicationRecord
   has_many :boards
 
   # Project services
+  has_one :alerts_service
   has_one :campfire_service
   has_one :discord_service
   has_one :drone_ci_service
@@ -2330,6 +2331,10 @@ class Project < ApplicationRecord
     protected_branches.limit(limit)
   end
 
+  def alerts_service_activated?
+    false
+  end
+
   private
 
   def closest_namespace_setting(name)

config/routes/project.rb

@@ -323,6 +323,8 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
         end
       end
 
+      post 'alerts/notify', to: 'alerting/notifications#create'
+
       resources :pipelines, only: [:index, :new, :create, :show, :destroy] do
         collection do
           resource :pipelines_settings, path: 'settings', only: [:show, :update]

ee/app/models/ee/project.rb

@@ -44,7 +44,6 @@ module EE
       has_one :jenkins_deprecated_service
       has_one :github_service
       has_one :gitlab_slack_application_service
-      has_one :alerts_service
 
       has_one :service_desk_setting, class_name: 'ServiceDeskSetting'
       has_one :tracing_setting, class_name: 'ProjectTracingSetting'
@@ -687,6 +686,7 @@ module EE
       feature_available?(:incident_management)
     end
 
+    override :alerts_service_activated?
     def alerts_service_activated?
       alerts_service_available? && alerts_service&.active?
     end

ee/config/routes/project.rb

@@ -127,8 +127,6 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
         end
       end
 
-      post 'alerts/notify', to: 'alerting/notifications#create'
-
       resource :tracing, only: [:show]
 
       resources :web_ide_terminals, path: :ide_terminals, only: [:create, :show], constraints: { id: /\d+/, format: :json } do

ee/spec/factories/services.rb

@@ -7,16 +7,6 @@ FactoryBot.define do
     type { 'GitlabSlackApplicationService' }
   end
 
-  factory :alerts_service do
-    project
-    type { 'AlertsService' }
-    active { true }
-
-    trait :inactive do
-      active { false }
-    end
-  end
-
   factory :github_service do
     project
     active { true }

spec/factories/services.rb

@@ -44,6 +44,16 @@ FactoryBot.define do
     end
   end
 
+  factory :alerts_service do
+    project
+    type { 'AlertsService' }
+    active { true }
+
+    trait :inactive do
+      active { false }
+    end
+  end
+
   factory :drone_ci_service do
     project
     active { true }

spec/models/project_spec.rb

@@ -5584,6 +5584,14 @@ describe Project do
     end
   end
 
+  describe '#alerts_service_activated?' do
+    let!(:project) { create(:project) }
+
+    subject { project.alerts_service_activated? }
+
+    it { is_expected.to be_falsey }
+  end
+
   def rugged_config
     rugged_repo(project.repository).config
   end

spec/services/projects/alerting/notify_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Projects::Alerting::NotifyService do
+  let_it_be(:project, reload: true) { create(:project) }
+
+  shared_examples 'does not process incident issues' do |http_status:|
+    it 'does not process issues' do
+      expect(IncidentManagement::ProcessAlertWorker)
+        .not_to receive(:perform_async)
+
+      expect(subject.status).to eq(:error)
+      expect(subject.http_status).to eq(http_status)
+    end
+  end
+
+  describe '#execute' do
+    let(:token) { 'invalid-token' }
+    let(:starts_at) { Time.now.change(usec: 0) }
+    let(:service) { described_class.new(project, nil, payload) }
+    let(:payload_raw) do
+      {
+        'title' => 'alert title',
+        'start_time' => starts_at.rfc3339
+      }
+    end
+    let(:payload) { ActionController::Parameters.new(payload_raw).permit! }
+
+    subject { service.execute(token) }
+
+    it_behaves_like 'does not process incident issues', http_status: 403
+  end
+end