如果为系统提供足够多的压力负载，您将观察到队列中当前正在等待的请求数量。
If you give enough stress loads to the system, you will observe a number of current waiting requests in the queues.
典型的消息代理系统经常将以异步方式处理来自相同流或并行队列的多个请求。
A typical message broker system will often be processing multiple requests from the same stream or queue in a parallel, asynchronous manner.
请求处理时间和队列长度是一个很好的度量指标，系统管理员通过监控它们来决定是增加服务器，还是关掉多余的服务器。
The request-processing time and the queue length are proper measures for the system administrator to monitor in order to make decisions about adding servers or shutting down superfluous servers.
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