MON-4509: Migrate Prometheus targets discovering from Endpoints to EndpointSlices

[machine424]

This PR migrates Prometheus service discovery from the deprecated Endpoints API to the EndpointSlices API, by:

• Setting serviceDiscoveryRole: EndpointSlice on ServiceMonitors.
• Granting Prometheus endpointslices permissions.

We're taking a conservative approach by keeping the existing endpoints permissions alongside the new endpointslices ones. This provides a safety net in case any ServiceMonitors, whether deployed from this repo or from another source, still rely on the same Role and were missed during the migration.

That said, since both resources provide essentially the same data, keeping both isn't meaningfully more permissive from a security standpoint.

These changes target OpenShift 4.22+ and should not be backported to earlier releases.

Due to the scope of changes across multiple repositories, these modifications were generated with Claude assistance.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci-robot]

@machine424: This pull request references MON-4509 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.22.0" version, but no target version was set.

Details

In response to this:

This PR migrates Prometheus service discovery from the deprecated Endpoints API to the EndpointSlices API, by:

• Setting serviceDiscoveryRole: EndpointSlice on ServiceMonitors.
• Granting Prometheus endpointslices permissions.

We're taking a conservative approach by keeping the existing endpoints permissions alongside the new endpointslices ones. This provides a safety net in case any ServiceMonitors, whether deployed from this repo or from another source, still rely on the same Role and were missed during the migration.

That said, since both resources provide essentially the same data, keeping both isn't meaningfully more permissive from a security standpoint.

These changes target OpenShift 4.22+ and should not be backported to earlier releases.

Due to the scope of changes across multiple repositories, these modifications were generated with Claude assistance.

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.

[machine424]

/retest-required

[machine424]

/verified by existing tests
/jira refresh

[openshift-ci-robot]

@machine424: This PR has been marked as verified by existing tests.

Details

In response to this:

/verified by existing tests
/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.

[openshift-ci-robot]

@machine424: This pull request references MON-4509 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.22.0" version, but no target version was set.

Details

In response to this:

/verified by existing tests
/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.

[dfajmon]

/lgtm
/approved

Adding a document for future proofing
https://github.com/openshift/prometheus-operator/blob/1056d8dfe7b4ab7fb9feb50069947f51287601d8/Documentation/platform/troubleshooting.md#L35

[dfajmon]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dfajmon, machine424

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[openshift-ci]

@machine424: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-azure-csi	973c12e	link	unknown	/test e2e-azure-csi

Full PR test history. Your PR dashboard.

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