Node that monitors all other nodes

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Hello!

I want to create a node (or a simple script) that monitors all my other nodes and warns me if a node is not receiving/sending data.

My current problem is that sometimes a subscriber node does not receive data due to network/connection problems. Because I have so many nodes running, I want to create a monitor node that simply warns me if something is wrong (maybe by checking the frequency of messages being received?).

How can I do this?

Thanks!