例如:
{myshovel, [
    {sources, ...}
    , {destinations, ...}
    , {queue, <<>>}
    , {ack_mode, on_confirm}
    , {publish_properties, [
        {delivery_mode, 2}
        , {timestamp, now} % this is the line I need to understand how to write
    ]}
    , {publish_fields, [{exchange, <<"">>}, {routing_key, <<"">>}]}
    , {reconnect_delay, 5}
]}
我很好奇如何以publish_properties某种方式编写,以便 RabbitMQ Shovel 用当前时间覆盖时间戳(就像当铲子接收到消息并将其铲到目标队列时一样)。