Remove feature flag metrics_dashboard_new_panel_page

Now that the new panel page on the frontend is ready, we can remove
the feature flag.

app/controllers/projects/environments_controller.rb

@@ -14,7 +14,6 @@ class Projects::EnvironmentsController < Projects::ApplicationController
 
     push_frontend_feature_flag(:prometheus_computed_alerts)
     push_frontend_feature_flag(:disable_metric_dashboard_refresh_rate)
-    push_frontend_feature_flag(:metrics_dashboard_new_panel_page)
   end
   before_action :authorize_read_environment!, except: [:metrics, :additional_metrics, :metrics_dashboard, :metrics_redirect]
   before_action :authorize_create_environment!, only: [:new, :create]

app/controllers/projects/metrics/dashboards/builder_controller.rb

@@ -4,7 +4,6 @@ module Projects
   module Metrics
     module Dashboards
       class BuilderController < Projects::ApplicationController
-        before_action :ensure_feature_flags
         before_action :authorize_metrics_dashboard!
 
         def panel_preview
@@ -21,10 +20,6 @@ module Projects
 
         private
 
-        def ensure_feature_flags
-          render_404 unless Feature.enabled?(:metrics_dashboard_new_panel_page, project)
-        end
-
         def rendered_panel
           @panel_preview ||= ::Metrics::Dashboard::PanelPreviewService.new(project, panel_yaml, environment).execute
         end

app/controllers/projects/metrics_dashboard_controller.rb

@@ -10,14 +10,9 @@ module Projects
     before_action do
       push_frontend_feature_flag(:prometheus_computed_alerts)
       push_frontend_feature_flag(:disable_metric_dashboard_refresh_rate)
-      push_frontend_feature_flag(:metrics_dashboard_new_panel_page)
     end
 
     def show
-      if params[:page].present? && !Feature.enabled?(:metrics_dashboard_new_panel_page, project)
-        return render_404
-      end
-
       if environment
         render 'projects/environments/metrics'
       else

changelogs/unreleased/231413-remove-feature-flag.yml

+---
+title: Make available new UI for adding a panel to a metrics dashboard
+merge_request: 39124
+author:
+type: added

spec/requests/projects/metrics/dashboards/builder_spec.rb

@@ -49,10 +49,6 @@ RSpec.describe 'Projects::Metrics::Dashboards::BuilderController' do
 
   describe 'POST /:namespace/:project/-/metrics/dashboards/builder' do
     context 'as anonymous user' do
-      before do
-        stub_feature_flags(metrics_dashboard_new_panel_page: true)
-      end
-
       it 'redirects user to sign in page' do
         send_request
 
@@ -62,7 +58,6 @@ RSpec.describe 'Projects::Metrics::Dashboards::BuilderController' do
 
     context 'as user with guest access' do
       before do
-        stub_feature_flags(metrics_dashboard_new_panel_page: true)
         project.add_guest(user)
         login_as(user)
       end
@@ -80,11 +75,6 @@ RSpec.describe 'Projects::Metrics::Dashboards::BuilderController' do
         login_as(user)
       end
 
-      context 'metrics_dashboard_new_panel_page is enabled' do
-        before do
-          stub_feature_flags(metrics_dashboard_new_panel_page: true)
-        end
-
       context 'valid yaml panel is supplied' do
         it 'returns success' do
           send_request(panel_yaml: valid_panel_yml)
@@ -112,18 +102,5 @@ RSpec.describe 'Projects::Metrics::Dashboards::BuilderController' do
         end
       end
     end
-
-      context 'metrics_dashboard_new_panel_page is disabled' do
-        before do
-          stub_feature_flags(metrics_dashboard_new_panel_page: false)
-        end
-
-        it 'returns not found' do
-          send_request
-
-          expect(response).to have_gitlab_http_status(:not_found)
-        end
-      end
-    end
   end
 end

spec/requests/projects/metrics_dashboard_spec.rb

@@ -96,26 +96,26 @@ RSpec.describe 'metrics dashboard page' do
   end
 
   describe 'GET :/namespace/:project/-/metrics/:page' do
-    it 'returns 200 with path param page and feature flag enabled' do
-      stub_feature_flags(metrics_dashboard_new_panel_page: true)
-
+    it 'returns 200 with path param page' do
       # send_request(page: 'panel/new') cannot be used because it encodes '/'
-      get "/#{project.namespace.to_param}/#{project.to_param}/-/metrics/panel/new"
+      get "#{dashboard_route}/panel/new"
 
       expect(response).to have_gitlab_http_status(:ok)
     end
 
-    it 'returns 404 with path param page and feature flag disabled' do
-      stub_feature_flags(metrics_dashboard_new_panel_page: false)
-
+    it 'returns 200 with dashboard and path param page' do
       # send_request(page: 'panel/new') cannot be used because it encodes '/'
-      get "/#{project.namespace.to_param}/#{project.to_param}/-/metrics/panel/new"
+      get "#{dashboard_route(dashboard_path: 'dashboard.yml')}/panel/new"
 
-      expect(response).to have_gitlab_http_status(:not_found)
+      expect(response).to have_gitlab_http_status(:ok)
     end
   end
 
   def send_request(params = {})
-    get namespace_project_metrics_dashboard_path(namespace_id: project.namespace, project_id: project, **params)
+    get dashboard_route(params)
+  end
+
+  def dashboard_route(params = {})
+    namespace_project_metrics_dashboard_path(namespace_id: project.namespace, project_id: project, **params)
   end
 end