While working on T245272, it came up that rsyslog-kubernetes is not in buster-wikimedia yet. This is the current status for rsyslog:
elukey@apt1001:/srv/wikimedia$ sudo reprepro lsbycomponent rsyslog rsyslog | 8.1901.0-1~bpo8+wmf1 | jessie-wikimedia | main | amd64, source rsyslog | 8.1901.0-1~bpo9+wmf1 | stretch-wikimedia | main | amd64, source rsyslog | 8.2008.0-1~bpo10+1 | buster-wikimedia | component/rsyslog | amd64, source
We don't have yet a buster-wikimedia branch in our rsyslog gerrit repo, so we'd need to figure out what to do now :)
After a chat with Filippo, IIUC 8.2008.0-1 is used only on centrallog nodes (hence the component - see T259780) but we might want to use 8.19011 provided on Buster and add the custom bits for rsyslog-kubernetes, uploading all to main. The alternative would be to modify 8.2008.0 and use the component instead (so adding rsyslog-kubernetes to it).
Any preference? :)
Long term https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=911299 will save us from this headache (hopefully).