OCPBUGS-58506: [release-4.15] Add missing service network DNS entries to KAS cert

[csrwng]

What this PR does / why we need it:
PR #6114 backported code that did not include the service network DNS entries for the kube apiserver. This was ok in releases 4.17 and newer because in those releases a separate certificate is created to serve those service network DNS entries. However in 4.16 and older, there is only one serving certificate for the kube apiserver. This resulted in clients like ACM failing to communicate with the kube apiserver because they use the service network endpoint to install the klusterlet in the hosted cluster. This fix adds the missing entries back into the dns names of the KAS serving certificate.

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story:
Fixes #OCPBUGS-58506

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csrwng

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[csrwng]

/area control-plane-operator

[enxebre]

/lgtm

[openshift-ci-robot]

@csrwng: This pull request references Jira Issue OCPBUGS-58506, which is invalid:

• expected dependent Jira Issue OCPBUGS-58505 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is POST instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

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

Details

In response to this:

What this PR does / why we need it:
PR #6114 backported code that did not include the service network DNS entries for the kube apiserver. This was ok in releases 4.17 and newer because in those releases a separate certificate is created to serve those service network DNS entries. However in 4.16 and older, there is only one serving certificate for the kube apiserver. This resulted in clients like ACM failing to communicate with the kube apiserver because they use the service network endpoint to install the klusterlet in the hosted cluster. This fix adds the missing entries back into the dns names of the KAS serving certificate.

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story:
Fixes #

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

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[openshift-ci]

@csrwng: all tests passed!

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[csrwng]

/jira refresh

[openshift-ci-robot]

@csrwng: This pull request references Jira Issue OCPBUGS-58506, which is valid. The bug has been moved to the POST state.

7 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.15.z) matches configured target version for branch (4.15.z)
• bug is in the state New, which is one of the valid states (NEW, ASSIGNED, POST)
• release note text is set and does not match the template
• dependent bug Jira Issue OCPBUGS-58505 is in the state Verified, which is one of the valid states (VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA))
• dependent Jira Issue OCPBUGS-58505 targets the "4.16.z" version, which is one of the valid target versions: 4.16.0, 4.16.z
• bug has dependents

No GitHub users were found matching the public email listed for the QA contact in Jira (yli2@redhat.com), skipping review request.

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In response to this:

/jira refresh

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[csrwng]

/label backport-risk-assessed

[openshift-ci-robot]

@csrwng: Jira Issue OCPBUGS-58506: All pull requests linked via external trackers have merged:

• openshift/hypershift#6394

Jira Issue OCPBUGS-58506 has been moved to the MODIFIED state.

Details

In response to this:

What this PR does / why we need it:
PR #6114 backported code that did not include the service network DNS entries for the kube apiserver. This was ok in releases 4.17 and newer because in those releases a separate certificate is created to serve those service network DNS entries. However in 4.16 and older, there is only one serving certificate for the kube apiserver. This resulted in clients like ACM failing to communicate with the kube apiserver because they use the service network endpoint to install the klusterlet in the hosted cluster. This fix adds the missing entries back into the dns names of the KAS serving certificate.

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story:
Fixes #OCPBUGS-58506

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

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-bot]

[ART PR BUILD NOTIFIER]

Distgit: hypershift
This PR has been included in build ose-hypershift-container-v4.15.0-202507111105.p0.ge94e279.assembly.stream.el9.
All builds following this will include this PR.

[openshift-merge-robot]

Fix included in accepted release 4.15.0-0.nightly-2025-07-14-202238

[csrwng]

/cherry-pick release-4.14

[openshift-cherrypick-robot]

@csrwng: new pull request created: #6742

Details

In response to this:

/cherry-pick release-4.14

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