当外部代理具有数据时，产生并发出预取指令。
When the external agent has data, it may create and issue a prefetch directive.
然而，在更典型的提供者场景中，消息流将部分工作委托给一个或多个外部代理。
However, a more typical provider scenario is one in which the message flow delegates some of the work to one or more external agents. For example, a message flow can do one of the following.
这些接口多种多样，而且许多产品都提供了用于通过外部代理发送警报的多种技术。
The interfaces vary, and many products provide more than one technique for sending alerts via an external agent.
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