Require Labels

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: require-labels
  annotations:
    policies.kyverno.io/title: Require Labels
    policies.kyverno.io/category: Best Practices
    policies.kyverno.io/minversion: 1.6.0
    policies.kyverno.io/severity: medium
    policies.kyverno.io/subject: Pod, Label
    policies.kyverno.io/description: Define and use labels that identify semantic attributes of your application or Deployment. A common set of labels allows tools to work collaboratively, describing objects in a common manner that all tools can understand. The recommended labels describe applications in a way that can be queried. This policy validates that the label `app.kubernetes.io/name` is specified with some value.
spec:
  validationFailureAction: Audit
  background: true
  rules:
    - name: check-for-labels
      match:
        any:
          - resources:
              kinds:
                - Pod
      validate:
        message: The label `app.kubernetes.io/name` is required.
        pattern:
          metadata:
            labels:
              app.kubernetes.io/name: "?*"