Users who would like to follow the upgrade status / want exact information which server is currently on which distro version are welcome to do so at:
https://docs.google.com/spreadsheets/d/1Ris18-joRFfd3OHjGJIraVUk-bpmIRORsPom...
It also tells you which servers have the special roles of scap proxy, mcrouter proxy, canary, and which are VMs (just mwdebug).
There is currently one debug server on buster (mwdebug1003) but we are going to provide the full set soon (https://phabricator.wikimedia.org/T274023).
For canary servers we are aiming to have both for the transitional period and the situation is currently as follows:
mw1261.eqiad.wmnet stretch mw1262.eqiad.wmnet stretch mw1263.eqiad.wmnet buster mw1264.eqiad.wmnet buster mw1265.eqiad.wmnet buster
Additionally one appserver (mw1403) and one API server (mw1402) on new hardware have been designated to stay on stretch until the end to allow for comparisons.
We appreciate reports of any issues just showing up on buster servers of all types (app, API, jobrunner/videoscaler).