As someone who used Checkmk Raw (the free edition) and stopped because it’s an absolute bastard to set up, I’m going to recommend Zabbix.

I feel the same way about Zabbix. I'm not going to pretend that CheckMk is super intuitive but I guess I got over the hump because I don't find it difficult to setup, use, or manage.

The reality is for a homelab setup, probably something like uptime kuma would fit the bill for most people. I wanted something like Zabbix or CheckMk for all the detailed stats that Op is looking for. The longer I use it the more I realize I don't need them 99% of the time and I should probably give something like uptime kuma a try myself.