... trees -->添加新的节点 2.devices-->选中你要添加的监控目标--->choose an action 选择place on a tree(新添加的节点) 第一，确定cacti所有的主机能ping通被监控主机；如果不能ping通，请确认网络配置和被监控主机的ip设置是否正确。
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扩展性：可以轻松修改在节点测试范围内新添加的元素，只需添加新的处理代码，而不必更改现有的代码。
Extensibility: Newly added elements that fall within the scope of the node tests can be easily accommodated by adding new processing code without modifying the existing code.
激活升级后的节点并进行配置使其能接受外来的请求(例如，将其重新添加到负载平衡器的路由表中)。
Activate the upgraded node and configure it to accept incoming requests (for example, add it back to the load balancer's routing table).
为了简化，这个插件会刷新父节点来显示新添加的文档。最终，文件会添加到库中并显示在树中。
For simplicity, the plug-in refreshes the parent to show the newly added document, and in the end, the file is added to the library and shows up in the tree.
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