OpenShift 4.20 compatibility

[manusa]

OpenShift 4.20 was released a couple of weeks ago:

https://www.redhat.com/en/blog/red-hat-openshift-42-what-you-need-to-know

We need to analyze what are the new API groups and provide the required models and DSLs to ensure compatibility.

https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/api_overview/api-index

Similar issues:

• Upgrade OpenShift Model to latest version of OpenShift API #5286

[ash-thakur-rh]

Hi @manusa , looking into this issue.

[ash-thakur-rh]

Below is the investigation of changes in APIs of OpenShift 4.13 to OpenShift 4.20:

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High level overview:

OpenShift	Kubernetes	API Removals
4.13	1.26	✅ Yes
4.14	1.27	✅ Yes
4.15	1.28	❌ No
4.16	1.29	✅ Yes
4.17	1.30	❌ No
4.18	1.31	✅ Yes (plugins)
4.19	1.32	✅ Yes
4.20	1.33	❌ No

---

Breaking Changes - Kubernetes APIs

Removed in 4.13 (K8s 1.26)

• ❌ autoscaling/v2beta2 HorizontalPodAutoscaler → Use autoscaling/v2
• ❌ flowcontrol.apiserver.k8s.io/v1beta1 FlowSchema, PriorityLevelConfiguration → Use v1beta2

Removed in 4.14 (K8s 1.27)

• ❌ storage.k8s.io/v1beta1 CSIStorageCapacity → Use storage.k8s.io/v1

Removed in 4.16 (K8s 1.29)

• ❌ flowcontrol.apiserver.k8s.io/v1beta2 FlowSchema, PriorityLevelConfiguration → Use v1beta3

Removed in 4.18 (K8s 1.31)

• ❌ CephFS volume plugin → Migrate to CSI driver
• ❌ Ceph RBD volume plugin → Migrate to CSI driver
• ❌ --keep-terminated-pod-volumes kubelet flag

Removed in 4.19 (K8s 1.32)

• ❌ flowcontrol.apiserver.k8s.io/v1beta3 FlowSchema, PriorityLevelConfiguration → Use v1

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New Features in 4.20

Kubernetes 1.33

• Runtime OCI Image Volume Source - Mount container images as volumes

OpenShift-Specific

• LeaderWorkerSet (LWS) API - AI workload management
• Gateway API Inference Extensions (GIE) - AI/ML traffic routing

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OpenShift Deprecations(not required for this issue)

Component	Version	Status	Action Required
DeploymentConfig API	4.14	Announced	Migrate to Deployment
Tekton Hub (tekton.dev)	4.20	Jan 2026 removal	Use ArtifactHub
AWS Outposts support	4.20	Deprecated	No replacement

---

[ash-thakur-rh]

Based on the above investigation below work is required to ensure OpenShift 4.20 compatibility:

• Check if the removed or moved APIs java models present in their relevant API groups after models upgrade in Upgrade Fabric8 Kubernetes Model to Kubernetes v1.34 #7048.
• Update OpenShift models.
• Add the support for LeaderWorkerSet API and Gateway API Inference Extensions API in OpenShift Client DSL.