Acknowledges a specific alarm associated with a parameter.

        :param alarm: Alarm instance
        :type alarm: :class:`.Alarm`
        :param str comment: Optional comment to associate with the state
                            change.

def acknowledge_alarm(self, alarm, comment=None):
        """
        Acknowledges a specific alarm associated with a parameter.

        :param alarm: Alarm instance
        :type alarm: :class:`.Alarm`
        :param str comment: Optional comment to associate with the state
                            change.
        """
        url = '/processors/{}/{}/parameters{}/alarms/{}'.format(
            self._instance, self._processor, alarm.name, alarm.sequence_number)
        req = rest_pb2.EditAlarmRequest()
        req.state = 'acknowledged'
        if comment is not None:
            req.comment = comment
        self._client.put_proto(url, data=req.SerializeToString())