If the Drupal 'queue' service implements this interface, the garbageCollection() method will be called during cron.
| Name | Modifiers | Type | Description |
|---|---|---|---|
| QueueGarbageCollectionInterface::garbageCollection | public | function | Cleans queues of garbage. |
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Queue!QueueGarbageCollectionInterface.php/interface/QueueGarbageCollectionInterface/8.1.x