https://github.com/Rudd-O/prometheus-xentop is a daemon you can run within your Qubes dom0 to serve statistics about your VMs to a Prometheus server you may be running.
To build, you can create a compatible build environment using https://github.com/Rudd-O/qubes-dom0-container-images .
“But, Rudd-O, how can a Prometheus serve reach into my dom0 securely to fetch data?”
Aha! I got you covered broski and siski: https://github.com/Rudd-O/prometheus-qubes-proxy