OCPBUGS-72387 Fix PDB blocking node drains during cluster upgrades

[jhadvig]

During cluster upgrades (4.20→4.21), the console and downloads PDBs block node draining when pods are unhealthy or stuck, causing MCO to timeout and fail:
Cannot evict pod as it would violate the pod's disruption budget

Solution:
Add unhealthyPodEvictionPolicy: AlwaysAllow to both PDBs.
This allows unhealthy/stuck pods to be evicted even if it violates the budget, while healthy pods remain protected by maxUnavailable: 1
Impact
✅ Unblocks cluster upgrades (fixes node drain failures)
✅ Maintains availability guarantee during normal operations
✅ Works for both SNO and HA topologies
✅ No behavior change for healthy pods

/assign @TheRealJon @cajieh

[jhadvig]

/cherry-pick release-4.21

[openshift-cherrypick-robot]

@jhadvig: once the present PR merges, I will cherry-pick it on top of release-4.21 in a new PR and assign it to you.

Details

In response to this:

/cherry-pick release-4.21

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[cajieh]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cajieh, jhadvig

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [jhadvig]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[cajieh]

/verified

[openshift-ci-robot]

@cajieh: The /verified command must be used with one of the following actions: by, later, remove, or bypass. See https://docs.ci.openshift.org/docs/architecture/jira/#premerge-verification for more information.

Details

In response to this:

/verified

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[cajieh]

/verified later @yapei

[openshift-ci-robot]

@cajieh: This PR has been marked to be verified later by @yapei.

Details

In response to this:

/verified later @yapei

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[cajieh]

/jira refresh

[openshift-ci-robot]

@cajieh: No Jira issue is referenced in the title of this pull request.
To reference a jira issue, add 'XYZ-NNN:' to the title of this pull request and request another refresh with /jira refresh.

Details

In response to this:

/jira refresh

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[cajieh]

/retest

[cajieh]

@jhadvig It looks like you need to update the title to include "OCPBUGS-72260".🙂

[openshift-ci]

@jhadvig: all tests passed!

Full PR test history. Your PR dashboard.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.