OK Question for the sysadmins / homelab nerds out there.

So I'm at a point where Ive go so much local and remote stuff running that I really would like to have a way to get system stats and set up alerts for events like some process in systemd crashing or traffic / resource use spikes.

I know of Nagios and Ive been looking over the docs for Zabbix as well. I guess I'm just wondering if there are any other systems that people recommend before I get to deep into one system.