esaProbeScheduleGroupType is a read-create ScheduleType choosing whether the group's schedule is one-shot (runs once then stops) or periodic (repeats every esaProbeScheduleGroupInterval seconds until stopped). An administrator picks periodic for ongoing SLA monitoring and one-shot for a single diagnostic test window. For example, a technician troubleshooting a one-time customer complaint sets the group to one-shot so the probes run once during the suspected problem window and then stop automatically, instead of running indefinitely.