unlike nova placment is a relitivly simple service conatining just a db and restapi.

since minor updates should not contain db model changes minor updates should just comprise updating the placement API containers.

schema migrations (db sync) can always be done before the container are updated.

placement may be a good candidate to support blue green upgrades using
RollingUpdate update-strategy
https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#update-strategies

we should have a spike to investigate that approach vs sclaing to 0 and back to the requested amount.