Use action_tag instead of default

                raise

        trans.controller = controller_name

        trans.action = action

        # Action can still refer to invalid and/or inaccurate paths here, so we use the actual

        # controller and method names to set the timing key.

        action_tag = getattr(method, "__name__", "default")

        environ["controller_action_key"] = (

            f"{'api' if environ['is_api_request'] else 'web'}.{controller_name}.{action or 'default'}"

            f"{'api' if environ['is_api_request'] else 'web'}.{controller_name}.{action_tag}"

        )

        # Combine mapper args and query string / form args and call

        kwargs = trans.request.params.mixed()