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Monitoring tools for services and resources?
(lemmy.ml)
I use the hosted version because the point of monitoring is that it alerts me when the rest of my stuff is down. You can self host it though.
I use NTFY.sh and a few python scripts to let me know about ssh logins, full disks and hosts that stop responding to pings. Very DIY but it works and doesn't rely on outside services.
Overlaps somewhat with /c/floss_replacement and /c/privacy; crossposts welcome