Openshift API server should not go unavailable during upgrade of an HA control plane

During the control plane upgrade e2e test, it seems that the openshift apiserver becomes unavailable during the upgrade process. The test is run on an HA control plane, and this should not happen.

4.15

Often

1. Create a hosted cluster with HA control plane and wait for it to become available
2. Upgrade the hosted cluster to a newer release
3. While upgrading, monitor whether the openshift apiserver is available by either querying APIService resources or resources served by the openshift apiserver.

The openshift apiserver is unavailable at some point during the upgrade

The openshift apiserver is available throughout the upgrade