apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata: 
  name: add-safe-to-evict
  annotations:
    policies.kyverno.io/category: Workload Management
    policies.kyverno.io/description: The Kubernetes cluster autoscaler does not evict pods that 
      use hostPath or emptyDir volumes. To allow eviction of these pods, the annotation 
      cluster-autoscaler.kubernetes.io/safe-to-evict=true must be added to the pods. 
spec: 
  rules: 
  - name: annotate-empty-dir
    match:
      any:
      - resources: 
          kinds:
          - Pod
    mutate: 
      patchStrategicMerge:
        metadata:
          annotations:
            +(cluster-autoscaler.kubernetes.io/safe-to-evict): "true"
        spec:          
          volumes: 
          - <(emptyDir): {}
