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Garbage Collection is processed by the Core Job Plugin GarbageCollector Job.
Scheduling the Garbage Collector
Ordinarily, the Garbage Collector is automatically scheduled. However, there may be scenarios will the job fails to schedule properly.
If deleting a CO generates a "No job of type CoreJob.GarbageCollector available" error, manually reschedule the GarbageCollector job via COmanage CO > Configuration > CO Settings > Garbage Collection > Schedule Job. If a View Job button is present instead, the Job has already been scheduled.