Verified with OCP build 4.5.0-0.nightly-2020-03-25-223812. Verification steps, 1. Make some apiservice fail, e.g. remove openshift-apiserver by: $ oc patch openshiftapiserver cluster --type=json -p '[{"op": "replace", "path": "/spec/managementState", "value": "Removed"}]' wait for a while, recovered it. $ oc patch openshiftapiserver cluster --type=json -p '[{"op": "replace", "path": "/spec/managementState", "value": "Managed"}]' 2. Open the prometheus UI from OCP web console -> alerts page, searching keyword ‘AggregatedAPIDown’ in page, some likes AggregatedAPIDown (11 active) will be displayed, click on the link, there are some unavailable API showing that . We can see the feature works well with PR merged OCP build.
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, 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-2020:2409