Node Declared Features

This KEP proposes a Node Declared Features framework for nodes to declare the availability of specific, feature-gated Kubernetes features. This would then be used by control plane components (such as the kube-scheduler, admission controllers, or the API server itself) to make informed decisions, primarily to manage version skew. For scheduling, the kube-scheduler would utilize these declared features to ensure pods are only placed on nodes that possess the necessary features to run them successfully. For API request validation, admission controllers would prevent operations on nodes that lack the required feature support. The intent is to streamline cluster operations by reducing the reliance on manual configurations like taints, tolerations, and complex node labeling schemes.