在此情况下，需要检查应用程序服务器的状态，以确保它们全都已启动和运行，并且已向位置服务守护进程注册。
In this case, the status of the application server needs to be checked to ensure they are all up and running and have registered with the location service daemon.
为了确保服务器不但完成了一个请求，而且还报告了一个 OK 状态，请在您的回调函数中添加另外一个检查功能，如 清单 7 所示。
To make sure that not only did the server finish with a request but that it also reported an OK status, add an additional check in your callback function as shown in Listing 7.
除域级别监控之外，您还可以深入探讨一个特殊的服务器，从节点视角详细检查er的状态。
Besides monitoring on the domain level, you can also drill-down to a particular server and get a detailed look at the status of er from the perspective of that node.
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