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.

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In response to this:

/cherry-pick release-4.21

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[cajieh]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [jhadvig]

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[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.

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/verified

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[cajieh]

/verified later @yapei

[openshift-ci-robot]

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

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/verified later @yapei

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[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.

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/jira refresh

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[cajieh]

/retest

[cajieh]

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

[openshift-ci]

@jhadvig: all tests passed!

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[openshift-ci-robot]

@jhadvig: This pull request references Jira Issue OCPBUGS-72387, which is valid. The bug has been moved to the POST state.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.22.0) matches configured target version for branch (4.22.0)
• bug is in the state ASSIGNED, which is one of the valid states (NEW, ASSIGNED, POST)

Requesting review from QA contact:
/cc @yapei

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

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

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.

[jhadvig]

Thanks @cajieh 👍

[openshift-ci-robot]

@jhadvig: Jira Issue OCPBUGS-72387: All pull requests linked via external trackers have merged:

• openshift/console-operator#1099

This pull request has the verified-later tag and will need to be manually moved to VERIFIED after testing. Jira Issue OCPBUGS-72387 has been moved to the MODIFIED state.

Details

In response to this:

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

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.

[openshift-cherrypick-robot]

@jhadvig: new pull request created: #1100

Details

In response to this:

/cherry-pick release-4.21

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[openshift-merge-robot]

Fix included in accepted release 4.22.0-0.nightly-2026-01-21-055002