all boxes need to be upgraded to bullseye. this milestone tracks related issues and larger projects that can't easily be automated.

As part of the OKR 2022 Q1/Q2 plan, we have set the following key results in this objective:

1. all machines are upgraded to bullseye
2. migrate to Prometheus for monitoring (team#29864) or upgrade to Inciga 2
3. upgrade to Mailman 3 or retire it in favor of Discourse (!) (team#40471)

Upgrade procedures and progress are also documented in the howto/upgrades/bullseye wiki page.