Add europe-west4 Region in the openshift-org-gcp profile set

[danilo-gemoli]

We have been using only the us-central1 region so far and, recently, we are noticing the ZONE_RESOURCE_POOL_EXHAUSTED in the GCP audit logs.
Add another region to mitigate this kind of quota limit issue.

Summary by CodeRabbit

• Chores
  • Rebalanced GCP quota allocations by introducing capacity in europe-west4 and reducing corresponding us-central1 allocations, creating a two-region split for several quota slices.
  • Updated public-facing quota identifiers to reflect the europe-west4 region for affected slices, improving regional distribution and availability.

[danilo-gemoli]

/hold
Next Monday

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: openshift/coderabbit/.coderabbit.yaml

Review profile: CHILL

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Run ID: 28672e3a-ebc0-4e79-8acf-ccbf4d5cd6d1

📥 Commits

Reviewing files that changed from the base of the PR and between 53a2545 and 7210a18.

📒 Files selected for processing (2)

• core-services/prow/02_config/_boskos.yaml
• core-services/prow/02_config/generate-boskos.py

🚧 Files skipped from review as they are similar to previous changes (1)

• core-services/prow/02_config/generate-boskos.py

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Walkthrough

Regional GCP quota-slice entries were moved from us-central1 to europe-west4 in Boskos configuration; the generator script's CONFIG was updated to split quota counts between us-central1 and europe-west4 for several quota-slice types.

Changes

Cohort / File(s)	Summary
Boskos configuration core-services/prow/02_config/_boskos.yaml	Replaced multiple us-central1 quota-slice names with europe-west4 equivalents and added new europe-west4 names for types: gcp-quota-slice, gcp-3-quota-slice, gcp-arm64-quota-slice, gcp-openshift-gce-devel-ci-2-quota-slice (specific index ranges updated; corresponding us-central1 entries removed).
Configuration generator core-services/prow/02_config/generate-boskos.py	Adjusted CONFIG counts to split slices across regions: for gcp-quota-slice, gcp-3-quota-slice, gcp-openshift-gce-devel-ci-2-quota-slice us-central1 reduced from 70→55 and europe-west4 added as 15; for gcp-arm64-quota-slice us-central1 reduced from 30→24 and europe-west4 added as 6. No control-flow or interface changes.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 10

✅ Passed checks (10 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding the europe-west4 region to the openshift-org-gcp profile set, which is the core objective across both modified files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Stable And Deterministic Test Names	✅ Passed	The PR modifies only boskos YAML configuration and Python generation script, neither containing Ginkgo test definitions or Go test code.
Test Structure And Quality	✅ Passed	This custom check is not applicable to the provided pull request. The PR exclusively modifies configuration files (a YAML boskos configuration file and a Python script for generating that configuration) and does not include any Ginkgo test code.
Microshift Test Compatibility	✅ Passed	This custom check for MicroShift Test Compatibility is not applicable to this pull request. The PR only modifies Boskos resource configuration files (YAML and Python), with no Ginkgo test patterns found.
Single Node Openshift (Sno) Test Compatibility	✅ Passed	This PR modifies infrastructure configuration files (YAML boskos config and Python generation script) without adding any new Ginkgo e2e tests, making the SNO test compatibility check inapplicable.
Topology-Aware Scheduling Compatibility	✅ Passed	Changes are limited to Boskos CI/CD infrastructure quota configuration, adding europe-west4 GCP region support. No Kubernetes pod scheduling constraints or topology-related configurations are involved.
Ote Binary Stdout Contract	✅ Passed	This custom check for OTE Binary Stdout Contract is not applicable to this pull request. The PR modifies only configuration files and a Python script with no changes to OTE test binaries or stdout behavior.
Ipv6 And Disconnected Network Test Compatibility	✅ Passed	The PR modifies only configuration files for Prow CI resource management, not Ginkgo e2e test files. No new e2e tests are being introduced.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

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[deepsm007]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danilo-gemoli, deepsm007

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• core-services/prow/02_config/OWNERS [danilo-gemoli,deepsm007]

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[openshift-merge-bot]

[REHEARSALNOTIFIER]
@danilo-gemoli: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.

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[openshift-ci]

@danilo-gemoli: all tests passed!

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