async def send_heartbeat(self, short_name):
        """Post a heartbeat for a service.

        Args:
            short_name (string): The short name of the service to query
        """

        if short_name not in self.services:
            raise ArgumentError("Unknown service name", short_name=short_name)

        self.services[short_name]['state'].heartbeat()
        await self._notify_update(short_name, 'heartbeat')