code: func (c *PipelineClient) PendingRequests() int {
  	c.connClientsLock.Lock()
  	n := 0
  	for _, cc := range c.connClients {
  		n += cc.PendingRequests()
  	}
  	c.connClientsLock.Unlock()
  	return n
  }
docs: // PendingRequests returns the current number of pending requests pipelined
  // to the server.
  //
  // This number may exceed MaxPendingRequests*MaxConns by up to two times, since
  // each connection to the server may keep up to MaxPendingRequests requests
  // in the queue before sending them to the server.
  //
  // This function may be used for balancing load among multiple PipelineClient
  // instances.