def expose_endpoint(self):
        """
        Expose /metrics endpoint on the same Sanic server.

        This may be useful if Sanic is launched from a container
        and you do not want to expose more than one port for some
        reason.
        """
        @self._app.route('/metrics', methods=['GET'])
        async def expose_metrics(request):
            return raw(self._get_metrics_data(),
                       content_type=CONTENT_TYPE_LATEST)