The osa-dispatcher.notify_threshold option is used to adjust the maximum number of OSAD clients that are simultaneously served by the SUSE Manager Server.
This is required as actions performed on clients configured with the OSAD contact method are performed as soon as the scheduling time/event arrives. If an action is scheduled on a high number of clients at the same time the SUSE Manager server can be overloaded. Setting this parameter to 100 for example will serve 100 clients at once and queue up the remaining actions at a later time. The recommended default parameter is 100.