I use icinga2/munin to monitor all of my systems, and when I switched from Supervised to HassOS, I lost the ability to monitor my Home Assistant instance. I could make use of snmp to monitor the system, if it provided me with the right metrics.
Home Assistant is an important part of my homelab, and I would very much like to have a way of monitoring it, and take action if there is problems in the horizon. And Munin is an excellent way of doing that.
I am using icinga2 and I can monitor homeassistant from icinga2 like CPU, updates, memory, node availability…
Here is an example of what I am monitoring:
Bumping this
Anyone interested in munin-node addon ?
I could knock one up but just the node but I’m not interested in hosting the munin master in HAOS (single point of failure)
Cheers
I reckon all 3 of us users of munin and home assistant would love someone else to write a munin-node plugin for home assistant 
I monitor my systems via SNMP, those I’ve created an SNMP add-on for HA
This approach could be adopted for many other monitoring agents like icinga, nrpe, zabbix, …
But it’s most likely that this will never land in HA-OS pre-installed, as the are to many monitoring systems/protocols available.