To contribute a little bit to the discussion-
On Mon, Mar 30, 2020 at 1:12 PM Manuel Arostegui marostegui@wikimedia.org wrote:
The rollback plan is basically, reimage back to Stretch and reclone from labsdb1012.
Buster/10.4 has been tested already in full mw production with mostly positive results, so it wouldn't be the first host to be upgraded!