I didn’t know about this project, so I took a quick look around.

I didn’t see any mention of Telemetry or Metrics, but I assume they can use this:

After starting Tails and connecting to Tor, Tails Upgrader automatically checks if upgrades are available and then proposes you to upgrade your USB stick. The upgrades are checked for and downloaded through Tor.

https://tails.net/doc/upgrade/index.en.html#automatic

Still, I just gave this a few minutes, so there could be more.

Give technitium a go, my woes diminished drastically with that.