Here’s an idea: when a node has an error (e.g. disk full), it could gossip that error via the p2p connections to other nodes, and then any error condition could be displayed in that node’s infobox (under “Remote Devices”) alongside its version number, address, et c.
Then, from one node (e.g. your desktop), you could see if your other connected nodes (e.g. your raspberry pis in closets somewhere) are having problems without setting up external monitoring.