kyverno/test/more/add_default_labels.yaml

---
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: add-default-labels
spec:
  admission: true
  background: false
  rules:
  - match:
      any:
      - resources:
          kinds:
          - Pod
          - Service
          - Namespace
    mutate:
      patchStrategicMerge:
        metadata:
          labels:
            custom-foo-label: my-bar-default
    name: add-default-labels
  validationFailureAction: Audit