ROX-35852: do not alert on openshift-custom-domains.*

[johannes94]

The custom domains operator is crashing every now and then on acs-prod-dp-02.

We are not using that operator and are not interested in this alerts. Additionally it is deprecated anyways.

This PR disables alerting for that namespace, to stop the noise in PagerDuty.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Central YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro Plus

Run ID: cee358cd-749c-475e-8422-62859b132b90

📥 Commits

Reviewing files that changed from the base of the PR and between b281035 and 99f1b66.

⛔ Files ignored due to path filters (2)

• resources/mixins/kubernetes/generated/alerts.yml is excluded by !**/generated/**
• resources/prometheus/generated/kubernetes-mixin-alerts.yaml is excluded by !**/generated/**

📒 Files selected for processing (1)

• resources/mixins/kubernetes/mixin.libsonnet

---

📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Updated namespace selection to exclude custom OpenShift domain namespaces, preventing unintended monitoring or processing of these resources.

Walkthrough

The Kubernetes mixin updates namespaceSelector to exclude namespaces matching openshift-custom-domains.*.

Changes

Kubernetes namespace filtering

Layer / File(s)	Summary
Update namespace selector resources/mixins/kubernetes/mixin.libsonnet	Adds openshift-custom-domains.* to the namespace exclusion patterns.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: kurlov

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: excluding openshift-custom-domains.* from alerting.
Description check	✅ Passed	The description explains the alerting change and its reason, including the unused deprecated operator and PagerDuty noise.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jmalsam/ignore-custom-domain-mixins

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[GrimmiMeloni]

LGTM