Support Oldest Node With Newest Control Plane

• One-line enhancement description (can be used as a release note): expand the supported skew between node and control plane components so that node components for the oldest supported minor version work with control plane components for the newest supported minor version.
• Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/tree/master/keps/sig-architecture/3935-oldest-node-newest-control-plane
• Discussion Link:
  • sig-cluster-lifecycle: 2023-04-04
  • sig-storage: 2023-04-06
  • sig-architecture: 2023-04-06
  • sig-node:
  • sig-network:
• Primary contact (assignee): @liggitt @derekwaynecarr
• Responsible SIGs:
  • sig-architecture
  • sig-node
  • sig-network
  • sig-cluster-lifecycle
• Enhancement target (which target equals to which milestone):
  • Stable release target (x.y): 1.28

• Stable
  • KEP (k/enhancements) update PR(s): KEP-3935: newest control planes support oldest nodes #3936
  • Code (k/k) update PR(s): n/a
  • Docs update(s):
    • Update the Kubernetes version skew policy as part of the release identified in step 3 - Update skew policy for n-3 nodes for 1.28/1.25+ website#42218
    • Update identified KEPs that need to adjust timelines - KEP-3935: Update timelines for vsphere/azurefile CSI removal #4136
    • Update the "Production Readiness Review - Version Skew Strategy" portion of the KEP template to remind KEP authors of max supported skews - KEP-3935: Update KEP template skew questions for n-3 nodes #4137
  • Tests
    • KEP-3935: update test configurations for n-3 node skew test-infra#29287

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.