Remove alert_management_detail feature flag

app/controllers/projects/alert_management_controller.rb

 # frozen_string_literal: true
 
 class Projects::AlertManagementController < Projects::ApplicationController
-  before_action :ensure_detail_feature_enabled, only: :details
   before_action :authorize_read_alert_management_alert!
   before_action do
     push_frontend_feature_flag(:alert_list_status_filtering_enabled)
@@ -14,10 +13,4 @@ class Projects::AlertManagementController < Projects::ApplicationController
   def details
     @alert_id = params[:id]
   end
-
-  private
-
-  def ensure_detail_feature_enabled
-    render_404 unless Feature.enabled?(:alert_management_detail, project)
-  end
 end

changelogs/unreleased/tr-remove-alert-detail-feature-flag.yml

+---
+title: Add Alert Detail view
+merge_request: 31877
+author:
+type: added

spec/controllers/projects/alert_management_controller_spec.rb

@@ -32,11 +32,6 @@ describe Projects::AlertManagementController do
   end
 
   describe 'GET #details' do
-    context 'when alert_management_detail is enabled' do
-      before do
-        stub_feature_flags(alert_management_detail: true)
-      end
-
     it 'shows the page' do
       get :details, params: { namespace_id: project.namespace, project_id: project, id: id }
 
@@ -54,19 +49,6 @@ describe Projects::AlertManagementController do
     end
   end
 
-    context 'when alert_management_detail is disabled' do
-      before do
-        stub_feature_flags(alert_management_detail: false)
-      end
-
-      it 'shows 404' do
-        get :details, params: { namespace_id: project.namespace, project_id: project, id: id }
-
-        expect(response).to have_gitlab_http_status(:not_found)
-      end
-    end
-  end
-
   describe 'set_alert_id' do
     it 'sets alert id from the route' do
       get :details, params: { namespace_id: project.namespace, project_id: project, id: id }