'This command is used to schedule downtime for all services in
a particular hostgroup.
During the specified downtime, Nagios will not send
notifications out about the services.
Note that scheduling downtime for services does not
automatically schedule downtime for the hosts those services
are associated with.
Syntax: SCHEDULE_HOSTGROUP_SVC_DOWNTIME;<hostgroup_name>;<start_time>;
<end_time>;<fixed>;<trigger_id>;<duration>;<author>;<comment>'

def schedule_hostgroup_svc_downtime(self, hostgroup, minutes=30):

    cmd = 'SCHEDULE_HOSTGROUP_SVC_DOWNTIME'
    dt_cmd_str = self._fmt_dt_str(cmd, hostgroup, minutes)
    self._write_command(dt_cmd_str)
