> It’s not like there are other contenders out there.

Apache Skywalking might be worth a look in some circumstances, doesn't eat too many resources, is fairly straightforwards to setup and run, admittedly somewhat jank (not the most polished UI or docs), but works okay: https://skywalking.apache.org/

Also I quite liked that a minimal setup is indeed pretty minimal: a web UI, a server instance and a DB that you already know https://skywalking.apache.org/docs/main/latest/en/setup/back...

In some ways, it's a lot like Zabbix in the monitoring space - neither will necessarily impress anyone, but both have a nice amount of utility.