anchor.diff:        {queue_overflow_suspend_period,
          State#state.queue_overflow_suspend_period,
          get_queue_overflow_suspend_period(State)},
  +      {counters,
  +       [{?max_processes_reached, get(?max_processes_reached)},
  +        {?max_messages_reached, get(?max_messages_reached)}]},
         {options, State#state.options}
        ],
        State};
  
positive.code:             end
      end.
  
  %% @doc Return current message queue length.
  -spec get_message_queue_len() -> non_neg_integer().
  get_message_queue_len() ->
  
negative.code:                   ok
            end),
      _MonRef = monitor(process, Pid),
      increment_counter(?async_workers).
  
  %% @doc Lookup SeqNum by RequestRef and remove it from the
  %% registry.
  