public QueueInterface::releaseItem($item)
Releases an item that the worker could not process.
Another worker can come in and process it before the timeout expires.
$item: The item returned by \Drupal\Core\Queue\QueueInterface::claimItem().
bool TRUE if the item has been released, FALSE otherwise.
public function releaseItem($item);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Queue!QueueInterface.php/function/QueueInterface::releaseItem/8.1.x