这个示例使用了一个预定义的“ping”Nagios插件，它将发送Internet控制信息协议(Internet Control Message Protocol, ICMP)回显请求以确定主机是否有响应。
This example USES a predefined "ping" Nagios plug-in, which sends Internet Control Message Protocol (ICMP) echo requests to determine if a host is responsive or not.
该服务回显客户端的输入和应用程序服务器的IP地址，以标识哪一个服务器处理该请求。
The service echoes the client's input and the IP address of the application server to identify which server handles the request.
当显式请求时，对象服务将这些更改保存回数据源。
When explicitly requested, Object Services saves those changes back to the data source.
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