Plan:
- wait for all timers to run so all data is up to date on wikistats-bookworm (MONDAY)
- announce -new so people can check somewhere
- add a wikistats-old proxy pointing to wikistats-bullseye
- switch wikistats proxy from -bullseye to -bookworm (TUESDAY 6PM UTC)
- announce switch in same place
- shut off wikistats-old (AFTER)