code: def list_length(queue, backend='sqlite'):
      '''
      Provide the number of items in a queue
  
      CLI Example:
  
      .. code-block:: bash
  
          salt-run queue.list_length myqueue
          salt-run queue.list_length myqueue backend=sqlite
      '''
      queue_funcs = salt.loader.queues(__opts__)
      cmd = '{0}.list_length'.format(backend)
      if cmd not in queue_funcs:
          raise SaltInvocationError('Function "{0}" is not available'.format(cmd))
      ret = queue_funcs[cmd](queue=queue)
      return ref list_length(queue, backend='sqlite'):
      '''
      Provide the number of items in a queue
  
      CLI Example:
  
      .. code-block:: bash
  
          salt-run queue.list_length myqueue
          salt-run queue.list_length myqueue backend=sqlite
      '''
      queue_funcs = salt.loader.queues(__opts__)
      cmd = '{0}.list_length'.format(backend)
      if cmd not in queue_funcs:
          raise SaltInvocationError('Function "{0}" is not available'.format(cmd))
      ret = queue_funcs[cmd](queue=queue)
      return ret
docs: Provide the number of items in a queue
  
      CLI Example:
  
      .. code-block:: bash
  
          salt-run queue.list_length myqueue
          salt-run queue.list_length myqueue backend=sqlite