docs: void handleLeaveEvent(LeaveEvent event)
      {
          final AsteriskQueueImpl queue = getInternalQueueByName(event.getQueue());
          final AsteriskChannelImpl channel = channelManager.getChannelImplByName(event.getChannel());
  
          if (queue == null)
          {
              logger.error("Ignored LeaveEvent for unknown queue " + event.getQueue());
              return;
          }
          if (channel == null)
          {
              logger.error("Ignored LeaveEvent for unknown channel " + event.getChannel());
              return;
          }
  
          final AsteriskQueueEntryImpl existingQueueEntry = queue.getEntry(event.getChannel());
          if (existingQueueEntry == null)
          {
              logger.error("Ignored leave event for non existing queue entry in queue " + event.getQueue() + " for channel "
                      + event.getChannel());
              return;
          }
  
          queue.removeEntry(existingQueueEntry, event.getDateReceived());
      }