What do you use to check how well it's running?
The whole point of running a daemon is that I don't have to monitor all of them all the time

My Bitcoin Core is doing just fine for many years now.
Obviously there's the standard infra metrics (CPU, memory, disk, network) that can become overloaded
For network, you can set an upload target (read: maximum). There's not really a reason for the rest to suddenly be overloaded, it's not as if Bitcoin is suddenly going to produce much more blocks to verify.