Nagios 过去也是仅用于从目标主机中轮询信息，但是现在提供了在目标主机上运行代理的插件。
Nagios also used to only poll information from its target hosts, but now has plug-ins that run agents on target hosts.
因此明智的做法是将警报消息的订阅与状态信息轮询相结合，提供一个健壮的与监控工具通讯的机制。
Therefore it is prudent to combine subscription to alert messages with polling of status information, to provide a robust mechanism for communicating with monitoring tools.
在长轮询请求中，客户机向服务器发出一个请求来检索可用信息。
In a long polling request, a client sends a request to a server to retrieve available information.
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