Performing PR pre-merge verification:

1. Launch a cluster with cluster-bot
launch openshift/cluster-version-operator#693 gcp

2. # oc get clusterversion
NAME      VERSION                                                  AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.9.0-0.ci.test-2021-11-22-032052-ci-ln-vn1q5pb-latest   True        False         4m1s    Cluster version is 4.9.0-0.ci.test-2021-11-22-032052-ci-ln-vn1q5pb-latest

3. Patch TechPreviewNoUpgrade to block upgrade
# oc patch featuregate cluster --type json -p '[{"op": "add", "path": "/spec/featureSet", "value": "TechPreviewNoUpgrade"}]'
featuregate.config.openshift.io/cluster patched

4. Wait for the alert appears
# curl -s -k -H "Authorization: Bearer $token"  https://$url/api/v1/alerts | jq -r '.data.alerts[]|select(.labels.alertname == "ClusterNotUpgradeable")'
{
  "labels": {
    "alertname": "ClusterNotUpgradeable",
    "condition": "Upgradeable",
    "endpoint": "metrics",
    "name": "version",
    "severity": "info"
  },
  "annotations": {
    "description": "In most cases, you will still be able to apply patch releases. Reason ClusterOperatorsNotUpgradeable. For more information refer to 'oc adm upgrade' or https://console-openshift-console.apps.ci-ln-vn1q5pb-72292.origin-ci-int-gce.dev.rhcloud.com/settings/cluster/.",
    "summary": "One or more cluster operators have been blocking minor version cluster upgrades for at least an hour."
  },
  "state": "pending",
  "activeAt": "2021-11-22T03:59:59.21303266Z",
  "value": "0e+00"
}


So, the severity has been changed to info.

The fix goes to 4.9.0-0.nightly-2021-11-25-070538. Based on comment#1, move it to verified state.

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 4.9.10 bug fix update), 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-2021:4889