Add targeted audit policy rules that suppress high-frequency, low-value
requests which were generating ~570k audit events per 10 hours and
causing kube-apiserver to consume 260-316m CPU per node.
Suppressed categories (no security impact):
- coordination.k8s.io/leases: controller/node heartbeats (86k GET + 46k PUT/10h)
- /healthz*, /readyz*, /livez*, /openapi*, /version: probe & discovery endpoints
- system:nodes user group: kubelet node status updates
- endpoints + endpointslices GET/LIST/WATCH: Cilium/CoreDNS polling
All other requests continue to be logged at Metadata level.
Result: 76% of audit events suppressed, non-leader apiserver CPU dropped
~50-60% (316m -> 125m on standby nodes). Policy lives in the patch file
so it survives cluster resets via talhelper genconfig.
