+++ This bug was initially created as a clone of Bug #1982868 +++ ... So to support rollbacks to 4.7, the 4.8 admission plugin probably needs to locally hard-code the CRD's 'HighlyAvailable' default. There are no 4.9-direct-to-4.7 rollbacks, so we don't need to touch master/4.9. Checking a 4.8->4.9->4.8 rollback job [1,2], that rollback actually completed, and the job failed because of some less-critical noise. So the topology thing is not an issue on master/4.9. [1]: https://testgrid.k8s.io/redhat-openshift-ocp-release-4.9-informing#periodic-ci-openshift-release-master-ci-4.9-upgrade-from-stable-4.8-e2e-aws-upgrade-rollback [1]: https://prow.ci.openshift.org/view/gs/origin-ci-test/logs/periodic-ci-openshift-release-master-ci-4.9-upgrade-from-stable-4.8-e2e-aws-upgrade-rollback/1415354016509988864
We can go back to NOTABUG now that bug 1982868 has been closed as a dup of 1977351; sorry for the noise.