(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 control plane pods do not run in best-effort QoS [Suite:openshift/conformance/parallel]

Significant regression detected.
Fishers Exact probability of a regression: 100.00%.
Test pass rate dropped from 100.00% to 87.50%.

Sample (being evaluated) Release: 4.20
Start Time: 2025-07-16T00:00:00Z
End Time: 2025-07-23T08:00:00Z
Success Rate: 87.50%
Successes: 21
Failures: 3
Flakes: 0

Base (historical) Release: 4.19
Start Time: 2025-05-18T00:00:00Z
End Time: 2025-06-17T23:59:59Z
Success Rate: 100.00%
Successes: 112
Failures: 0
Flakes: 0

View the test details report for additional context.

Other related tests are also regressed:

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

[sig-arch] Managed cluster should set requests but not limits [Suite:openshift/conformance/parallel]