'This command is used to schedule downtime for all hosts in a
particular servicegroup.
During the specified downtime, Nagios will not send
notifications out about the hosts.
Syntax: SCHEDULE_SERVICEGROUP_HOST_DOWNTIME;<servicegroup_name>;
<start_time>;<end_time>;<fixed>;<trigger_id>;<duration>;<author>;
<comment>'

def schedule_servicegroup_host_downtime(self, servicegroup, minutes=30):

    cmd = 'SCHEDULE_SERVICEGROUP_HOST_DOWNTIME'
    dt_cmd_str = self._fmt_dt_str(cmd, servicegroup, minutes)
    self._write_command(dt_cmd_str)
