kyverno/test/conformance/chainsaw/mutate/existing/preconditions/policy.yaml

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: test
spec:
  mutateExistingOnPolicyUpdate: true
  rules:
    - name: test
      match:
        any:
          - resources:
              kinds:
                - Namespace
              names:
                - default
      mutate:
        targets:
          - kind: Pod
            apiVersion: '*'
            name: '*'
            namespace: "{{ request.object.metadata.name }}"
            preconditions:
              all:
                - key: "{{ target.metadata.annotations.\"policy.lan/value\" }}"
                  operator: Equals
                  value: foo
        patchStrategicMerge:
          metadata:
            labels:
              policy-applied: 'true'