Strange warning: Host has no rauc support. OTA updates have been disabled

I am moving my Home Assistant from a Raspberry Pi to an Intel NUC running Home Assistant 0.106.5 in a Docker container. My testing requires some reboots. I just noticed this warning in my System Log:
"20-03-10 13:32:22 WARNING (MainThread) [supervisor.dbus.rauc] Host has no rauc support. OTA updates have been disabled."

  1. should I be concerned?
  2. What is ‘rauc’?

No.

https://rauc.io/

Nothing to worry about…expected as you’re not running HA OS

See here:

LOL…7 months!

it sometimes works, sometimes doesnt. Try rebootin host pc, worked for me last time.

Prompt replies are normal here.