Back in 2017 when I had a bunch of physical machines and unmanaged VMs we ended up putting netdata on the servers. The reason why was because most of the team was used to manually logging onto servers and diagnosing the issue manually.

The reason I liked it was because it exposes a standard Prometheus endpoint I can scrape and then view using something like Grafana. There are only about 20,000 Grafana dashboard modules available for netdata but generally you can find one that works for you. Having that prometheus endpoint allows you to springboard into the cloud and get like-metrics out of your cloud stuff as well, with a nice long historical data trail from your older/est machines.