We have two helpers for returning a "message" in an API response, one that's a plain "message" node (render_message) and one that wraps it in an "error" layout (render_error with custom_error view).

render_message should probably be used when the operation was successful, e.g. default PXE menu build, but render_error should be used when an exception or error is raised.

Check usage of render_message for any that should be using the regular exception handler (e.g. app/controllers/api/v2/operatingsystems_controller.rb, bootfiles) or using render_error (app/controllers/api/v2/hostgroups_controller.rb, destroy).