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I'd start with vanilla kubernetes changelogs https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.27.md and blog posts: https://kubernetes.io/blog/2022/12/09/kubernetes-v1-26-release/ (each release has one) and Deprecated APIs: https://kubernetes.io/docs/reference/using-api/deprecation-guide/

Be on the lookout for death of PSPs if that’s relevant to you.

Cool thanks