ValidatingAdmissionPolicy: moving admission control into the API server with CEL
Kyverno 1.17 deprecates classic ClusterPolicy in favor of CEL-native ValidatingPolicy, with removal planned for v1.20. ValidatingAdmissionPolicy has been stable since Kubernetes 1.30 and runs CEL directly inside kube-apiserver — no webhook, no network hop, no separate pod. We break down the CEL expression model, migrate a real policy, and measure the latency before/after.
