Create 4.20 cluster pool with 3 nodes

[evallesp]

This patch creates a new 4.20 cluster pool using previously idle cluster deployment customizations (CDC-20, 21 and 22).

The cluster pool is initially configured with size: 0 to defer provisioning until needed.

Standardized CDC-21 and CDC-22 to use default c1.memory.large flavor for consistency across all pool clusters.

Summary by CodeRabbit

This PR establishes a new OpenShift 4.20 cluster pool for the OpenStack Kubernetes Operators testing infrastructure and standardizes the underlying cluster deployment customizations.

Changes to OpenShift CI infrastructure:

1. New 4.20 Cluster Pool Created: A new ClusterPool resource (oko-op-09) has been added to support OpenShift 4.20 testing in the Vexxhost environment. The pool is configured with zero initial size to defer cluster provisioning until needed, and references three cluster deployment customizations (CDC-20, CDC-21, and CDC-22).

2. CDC-21 and CDC-22 Standardization: Both customizations have been simplified by removing custom OpenStack compute flavor overrides. This allows them to default to the standard c1.memory.large flavor, ensuring consistency across the cluster pool. The customizations retain their network configuration (floating IP and external network patches) and cluster naming patches.

These changes enable efficient resource utilization by consolidating previously idle cluster deployments into a unified 4.20 cluster pool while maintaining standardized compute configurations.

[openshift-merge-bot]

[REHEARSALNOTIFIER]
@evallesp: 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.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Central YAML (inherited)

Review profile: CHILL

Plan: Enterprise

Run ID: c2a38fb2-d015-495e-8075-b1aeadedb1db

📥 Commits

Reviewing files that changed from the base of the PR and between acdd633 and e4e92e9.

📒 Files selected for processing (3)

• clusters/hosted-mgmt/hive/pools/openstack-k8s-operators/openstack-k8s-operators-4-20-vexxhost-hybrid_clusterpool.yaml
• clusters/hosted-mgmt/hive/pools/openstack-k8s-operators/openstack-k8s-operators-cdc-vexx-21.yaml
• clusters/hosted-mgmt/hive/pools/openstack-k8s-operators/openstack-k8s-operators-cdc-vexx-22.yaml

💤 Files with no reviewable changes (2)

• clusters/hosted-mgmt/hive/pools/openstack-k8s-operators/openstack-k8s-operators-cdc-vexx-22.yaml
• clusters/hosted-mgmt/hive/pools/openstack-k8s-operators/openstack-k8s-operators-cdc-vexx-21.yaml

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Walkthrough

A new Hive ClusterPool manifest for OCP 4.20 on Vexxhost hybrid is added with capacity controls set to 0. Two existing ClusterDeploymentCustomization manifests (vexx-21, vexx-22) have their compute flavor/type override patches removed and replaced with a /metadata/name replace patch.

Changes

Vexxhost ClusterPool and CDC updates

Layer / File(s)	Summary
New OCP 4.20 Vexxhost ClusterPool clusters/hosted-mgmt/hive/pools/openstack-k8s-operators/openstack-k8s-operators-4-20-vexxhost-hybrid_clusterpool.yaml	Adds a complete ClusterPool manifest with pool identity, OCP 4.20 image set and version bounds, CDC inventory references, OpenStack platform credentials, pull secret, and all capacity/concurrency counts set to 0.
CDC patch updates for vexx-21 and vexx-22 clusters/hosted-mgmt/hive/pools/openstack-k8s-operators/openstack-k8s-operators-cdc-vexx-21.yaml, clusters/hosted-mgmt/hive/pools/openstack-k8s-operators/openstack-k8s-operators-cdc-vexx-22.yaml	Removes the computeFlavor and platform/openstack/type override patches from both CDC manifests and adds a replace operation for /metadata/name (oko-21 and oko-22 respectively).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 15

✅ Passed checks (15 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Create 4.20 cluster pool with 3 nodes' accurately describes the main change: creating a new OpenShift 4.20 cluster pool with three cluster deployment customizations (CDC-20, CDC-21, CDC-22).
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.
Stable And Deterministic Test Names	✅ Passed	PR contains only YAML Kubernetes/OpenShift manifests (ClusterPool and ClusterDeploymentCustomization resources); no Ginkgo test files present, so test naming check is not applicable.
Test Structure And Quality	✅ Passed	Pull request contains only YAML configuration files (ClusterPool and ClusterDeploymentCustomization manifests); no Ginkgo test code exists to review, making the check not applicable.
Microshift Test Compatibility	✅ Passed	This PR contains only YAML infrastructure manifests (ClusterPool and ClusterDeploymentCustomization resources), not Ginkgo e2e tests. The MicroShift test compatibility check does not apply.
Single Node Openshift (Sno) Test Compatibility	✅ Passed	PR contains only YAML manifest changes for cluster pool/deployment customization configurations. No Ginkgo e2e tests (It(), Describe(), Context(), When()) were added, so SNO compatibility check is...
Topology-Aware Scheduling Compatibility	✅ Passed	PR adds Hive ClusterPool and CDC manifests for cluster provisioning; contains no pod scheduling constraints (affinity, topology spread, PDB, nodeSelector) that would break non-HA topologies.
Ote Binary Stdout Contract	✅ Passed	PR contains only YAML configuration manifests for OpenShift cluster pools; no executable code exists to violate the OTE stdout contract.
Ipv6 And Disconnected Network Test Compatibility	✅ Passed	This PR adds only YAML manifest files (ClusterPool and ClusterDeploymentCustomization resources), not Ginkgo e2e tests. The check is not applicable.
No-Weak-Crypto	✅ Passed	PR contains only YAML configuration files (Kubernetes/OpenShift manifests) with no cryptographic code, weak algorithms, or custom implementations.
Container-Privileges	✅ Passed	The PR adds/modifies Hive ClusterPool and ClusterDeploymentCustomization resources containing no container specifications, securityContext configs, or privilege-escalation settings.
No-Sensitive-Data-In-Logs	✅ Passed	PR adds/modifies only Kubernetes manifest YAML files with no logging code, hardcoded credentials, or logging configurations that expose sensitive data.

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✨ Finishing Touches

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• Create PR with unit tests

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[openshift-ci]

Hi @evallesp. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: evallesp
Once this PR has been reviewed and has the lgtm label, please assign olliewalsh for approval. For more information see the Code Review Process.

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