cadvisor and node exporter are inaccurate or missing critical metrics because hassos doesn't allow add-ons to mount important host directories like /sys and the root directory, which are needed for proper monitoring

in the meantime, one can run them directly in hassos by ssh-ing into the base container (with the help of the ssh add-on) with the following commands

node exporter

docker run \
  --volume=/:/rootfs:ro \
  --volume=/sys:/host/sys:ro \
  --volume=/proc:/host/proc:ro \
  --volume=/:/host:ro,rslave \
  --name=node-exporter \
  --detach=true \
  --net="host" \
  --pid="host" \
  quay.io/prometheus/node-exporter:v1.9.1 \
  --path.rootfs=/host \
  --path.procfs=/host/proc \
  --path.sysfs=/host/sys \
  '--collector.filesystem.mount-points-exclude=^/(sys|proc|dev|host|etc|var/lib/docker|var/log/journal)($$|/)' \
  '--collector.netdev.device-exclude=^(veth.*)$$'

cadvisor

docker run \
  --volume=/:/rootfs:ro \
  --volume=/var/run:/var/run:ro \
  --volume=/sys:/sys:ro \
  --volume=/var/lib/docker/:/var/lib/docker:ro \
  --publish=8080:8080 \
  --detach=true \
  --name=cadvisor \
  --privileged \
  gcr.io/cadvisor/cadvisor:v0.52.1 \
  -docker_only=true \
  -housekeeping_interval=30s