The two that I looked at appear related to the etcd quorum guard pod. Diagnosis looks like this 1. inspect the co/machine-config . This shows that the pool didn't upgrade and lists a problem with "error when evicting pod" and lists a quorum guard pod 2. That quorum guard pod is for etcd and the two I looked at were both in ns/openshift-machine-config-operator I haven't dug further.
from here: https://openshift-release.apps.ci.l2s4.p1.openshiftapps.com/#4.6.0-0.ci find one where upgrade column is red. Click the job, then click the failed upgrade.
After https://github.com/openshift/cluster-etcd-operator/pull/429 upgrade minor appears to be passing regularly.
Verified with checking ci job result.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (OpenShift Container Platform 4.6 GA Images), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:4196
Removing UpgradeBlocker from this older bug, to remove it from the suspect queue described in [1]. If you feel like this bug still needs to be a suspect, please add keyword again. [1]: https://github.com/openshift/enhancements/pull/475