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Lehrer, Hobbyist
deleted by creator
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.
There are no established conventions yet, you can do as you please. There are some frameworks trying to create structures, but they are in no way mandatory or even agreed upon.