not required there, if anything should go in the initializer

config/application.rb

@@ -20,8 +20,6 @@ module Discourse
     # -- all .rb files in that directory are automatically loaded.
 
     require 'discourse'
-    # initializes message bus too early, not picking on redis settings, needs to be fixed
-    # require 'message_bus_diags'
 
     # Custom directories with classes and modules you want to be autoloadable.
     config.autoload_paths += %W(#{config.root}/app/serializers)