Nimbostratus
Nimbostratusthans a lot Daniel
i understand that but it is more like an assumption based on experience , i cannot find any document explaining precisely this classification
MVPSee the section Monitor association with pools and nodes >> Monitor-to-node association
"...
Node-only monitors specify a destination address in the format of an IP address with no service port (for example, 10.10.10.2). Conversely, monitors that you can associate with nodes, pools, and pool members specify a destination address in the format of an IP address and service port (for example, 10.10.10.2:80). Therefore, when you use the BIG-IP Configuration utility to associate a monitor with a pool, pool member, or node, the utility displays only those pre-configured monitors that are designed for association with that server.
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Yes, you can say that you will learn this only with experience. But it is also written in the manual.