I remember that alternative, free/FOSS products existed before Grafana (c2015) but many died, Grafana was everywhere. Now I also cannot find the old-alts. Vague memories of RRD and Nagios...
Munin was what we used for a while, along with a smattering of smokeping.
We're using a combination of Zabbix (alerting) and local Grafana/Prometheus/Loki (observability) at this point, but I've been worried about when Grafana will rug-pull for a while now. Hopefully enough people using their cloud offering sates their appetite and they leave the people running locally alone.
