OCPBUGS-58102: Expose ExternalDNS operand metrics via kube-rbac-proxy sidecar

[Thealisyed]

The ExternalDNS operand binds its Prometheus metrics to localhost (127.0.0.1:7979), making them invisible to the cluster monitoring stack. This adds a kube-rbac-proxy sidecar to proxy metrics over HTTPS, along with a Service and ServiceMonitor for Prometheus discovery.

• Add --kube-rbac-proxy-image CLI flag and operator config plumbing
• Inject one kube-rbac-proxy sidecar per zone container (ports 8443+) so multi-zone deployments expose all metrics
• Create metrics Service with serving-cert annotation for auto TLS
• Create ServiceMonitor with scheme: https, bearerTokenFile, and tlsConfig for authenticated Prometheus scraping
• Add tokenreviews/subjectaccessreviews RBAC for kube-rbac-proxy auth
• Add Service watch to controller for reconciliation on drift

Assisted-by: Claude

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@Thealisyed: The following tests 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-gcp-operator	3f8cd03	link	true	/test e2e-gcp-operator
ci/prow/e2e-azure-infoblox-operator	3f8cd03	link	true	/test e2e-azure-infoblox-operator
ci/prow/e2e-azure-operator	3f8cd03	link	true	/test e2e-azure-operator
ci/prow/verify	3f8cd03	link	true	/test verify
ci/prow/e2e-aws-shared-vpc-phz-operator	3f8cd03	link	true	/test e2e-aws-shared-vpc-phz-operator
ci/prow/e2e-aws-operator	3f8cd03	link	true	/test e2e-aws-operator

Full PR test history. Your PR dashboard.

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[openshift-ci-robot]

@Thealisyed: This pull request references Jira Issue OCPBUGS-58102, which is invalid:

• expected the bug to target the "4.22.0" version, but no target version was set

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:

The ExternalDNS operand binds its Prometheus metrics to localhost (127.0.0.1:7979), making them invisible to the cluster monitoring stack. This adds a kube-rbac-proxy sidecar to proxy metrics over HTTPS, along with a Service and ServiceMonitor for Prometheus discovery.

• Add --kube-rbac-proxy-image CLI flag and operator config plumbing
• Inject one kube-rbac-proxy sidecar per zone container (ports 8443+) so multi-zone deployments expose all metrics
• Create metrics Service with serving-cert annotation for auto TLS
• Create ServiceMonitor with scheme: https, bearerTokenFile, and tlsConfig for authenticated Prometheus scraping
• Add tokenreviews/subjectaccessreviews RBAC for kube-rbac-proxy auth
• Add Service watch to controller for reconciliation on drift

Assisted-by: Claude

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.

[alebedev87]

/assign

[Thealisyed]

/jira refresh

[openshift-ci-robot]

@Thealisyed: This pull request references Jira Issue OCPBUGS-58102, 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 @melvinjoseph86

Details

In response to this:

/jira refresh

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