...
The condor_startd daemon will shutdown gracefully and not be restarted if the ClassAd STARTD.DAEMON_SHUTDOWN evlauates to True. E.g.
STARTD.DAEMON_SHUTDONW = State size(ChildState) == "Unclaimed" 0 && Activity size(ChildActivity) == "Idle" 0 && (CurrentTime MyCurrentTime - EnteredCurrentActivity) > 600'
MASTER.DAEMON_SHUTDOWN = STARTD_StartTime == 0
...