public QueueInterface::numberOfItems()
Retrieves the number of items in the queue.
This is intended to provide a "best guess" count of the number of items in the queue. Depending on the implementation and the setup, the accuracy of the results of this function may vary.
e.g. On a busy system with a large number of consumers and items, the result might only be valid for a fraction of a second and not provide an accurate representation.
An integer estimate of the number of items in the queue.
public function numberOfItems();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Queue!QueueInterface.php/function/QueueInterface::numberOfItems/8.1.x