Lehrer, Hobbyist
Netdata is free and can be run standalone. Just install it and do not configure the cloud integration. You can see your dashboard on localhost:19999
I use NixOS for everything. I have a Nix flake that defines my systems (two VPS, a desktop, a laptop and a little home server) and I can modularize the config snippets that apply to the machines so I can effortlessly reuse them. Add to that the atomic updates and reliable rollback and there you have it.
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