Hi Adam, sorry for the very late reply.
I also found out that the "mgr/cephadm/upgrade_state" config key was the issue.
I actually just modified the config key and removed the unknown fields. This
made "ceph orch" commands work again. Great.
However, the downgrade process was quickly stuck on
for the specific issue with that traceback, you can probably resolve that
by removing the stored upgrade state. We put it at
`mgr/cephadm/upgrade_state` I believe (can check "ceph config-key ls" and
look for something related to upgrade state if that doesn't work) so
running "ceph config-key rm mgr
