(Feel free to update this bug's summary to be more specific.)
Component Readiness has found a potential regression in the following test:

[sig-arch] Managed cluster should ensure platform components have system-* priority class associated [Suite:openshift/conformance/parallel]

Significant regression detected.
Fishers Exact probability of a regression: 100.00%.
Test pass rate dropped from 100.00% to 85.19%.

Sample (being evaluated) Release: 4.20
Start Time: 2025-10-07T00:00:00Z
End Time: 2025-10-14T12:00:00Z
Success Rate: 85.19%
Successes: 11
Failures: 4
Flakes: 12
Base (historical) Release: 4.19
Start Time: 2025-05-18T00:00:00Z
End Time: 2025-06-17T23:59:59Z
Success Rate: 100.00%
Successes: 97
Failures: 0
Flakes: 15

View the test details report for additional context.

Also affects:

[sig-instrumentation] Prometheus [apigroup:image.openshift.io] when installed on the cluster shouldn't report any alerts in firing state apart from Watchdog and AlertmanagerReceiversNotConfigured [Early][apigroup:config.openshift.io] [Skipped:Disconnected] [Suite:openshift/conformance/parallel]

[sig-node][apigroup:config.openshift.io] CPU Partitioning cluster infrastructure should be configured correctly [Suite:openshift/conformance/parallel]

[sig-arch] Managed cluster should ensure platform components have system-* priority class associated [Suite:openshift/conformance/parallel]

Issue is already resolved, see this thread

This bug is for tracking purposes.

Filed by: dgoodwin@redhat.com