For web-application monitoring, we’ve [1] gone the approach of outside-in monitoring. There’s many approaches to monitoring and depending on your role in a team, you might care more about the individual health of each server, or the application as a whole, independent of its underlying (virtual) hardware.

For web applications for instance, we care about uptime & performance, tls certificates, dns changes, crawled broken links/mixed content & seo/lighthouse metrics.

[1] https://ohdear.app