add_servicegroup( params )
@icinga.add_servicegroup(service_group: 'foo', display_name: 'FOO')
delete_servicegroup( params )
@icinga.delete_servicegroup(service_group: 'foo')
servicegroups( params )
@icinga.servicegroups(service_group: 'disk')
servicegroups
@icinga.servicegroups
exists_servicegroup?( service_group )
@icinga.exists_servicegroup?('disk')