Add pghero for analyzing postgres performance in production

config/routes.rb

@@ -5,6 +5,7 @@ Rails.application.routes.draw do
 
   authenticate :user, lambda { |u| u.admin? } do
     mount Sidekiq::Web => '/sidekiq'
+    mount PgHero::Engine, at: 'pghero'
   end
 
   use_doorkeeper do