test:
[sig-cluster-lifecycle] Cluster version operator acknowledges upgrade 

is failing frequently in CI, see search results:
https://search.ci.openshift.org/?maxAge=168h&context=1&type=bug%2Bjunit&name=&maxMatches=5&maxBytes=20971520&groupBy=job&search=%5C%5Bsig-cluster-lifecycle%5C%5D+Cluster+version+operator+acknowledges+upgrade


https://prow.ci.openshift.org/view/gs/origin-ci-test/logs/release-openshift-origin-installer-e2e-aws-upgrade-4.5-stable-to-4.6-ci/1298389304053075968

[sig-arch][Feature:ClusterUpgrade] Cluster should remain functional during upgrade [Disruptive] [Serial] [Suite:openshift] expand_less	8m8s
fail [github.com/openshift/origin@/test/e2e/upgrade/upgrade.go:139]: during upgrade to registry.svc.ci.openshift.org/ocp/release:4.6.0-0.ci-2020-08-24-152549
Unexpected error:
    <*errors.errorString | 0xc0029631f0>: {
        s: "timed out waiting for cluster to acknowledge upgrade: timed out waiting for the condition",
    }
    timed out waiting for cluster to acknowledge upgrade: timed out waiting for the condition
occurred