I try to use Open Source when a good solution exists, so for my home firewall, I’m using OPNSense   a very powerful FreeBSD-based firewall appliance with great features along with a powerful GUI. One of the plugins available with OPNSense is  node_exporter, which exposes a lot of operating system metrics through the Prometheus protocol. [&]

https://www.percona.com/blog/2021/04/06/monitoring-opnsense-firewall-with-percona-monitoring-and-management/