Release notes for kOps 1.31 series

This is a document to gather the release notes prior to the release.

Significant changes

• Kubernetes minor version upgrades to 1.31 should be performed using a new kops reconcile cluster command.

Kubernetes 1.31 introduces stricter checks around the version-skew policy. While kOps has always followed the version-skew policy, there was an edge case: nodes that were added by an autoscaler during a rolling-update would not always follow the version-skew policy.

See docs/tutorial/upgrading-kubernetes.md for more details.

Other changes of note

• Cilium has been upgraded to v1.16.

• Spotinst cluster controller V1 is replaced with Ocean kubernetes controller V2, all old k8s resource are removed except spotinst-kubernetes-cluster-controller Secret.

Deprecations

• Support for Kubernetes version 1.25 is removed in kOps 1.31.

• Support for Kubernetes version 1.26 is deprecated and will be removed in kOps 1.32.