x1 should be an "easy" section to upgrade fully, as it doesn't replicate labs hosts, so we could upgrade up to the master.
- db1120 (eqiad master)
- db1095 (removed) moved now to db1102 as buster (backup source)
- db2096 (codfw master)
- db2101 (backup source)
- dbstore1005 (T254870 )