Restrict Annotations

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: restrict-annotations
  annotations:
    policies.kyverno.io/title: Restrict Annotations
    policies.kyverno.io/category: Sample
    policies.kyverno.io/minversion: 1.6.0
    policies.kyverno.io/subject: Pod, Annotation
    policies.kyverno.io/description: Some annotations control functionality driven by other cluster-wide tools and are not normally set by some class of users. This policy prevents the use of an annotation beginning with `fluxcd.io/`. This can be useful to ensure users either don't set reserved annotations or to force them to use a newer version of an annotation.
    pod-policies.kyverno.io/autogen-controllers: none
spec:
  validationFailureAction: Audit
  background: true
  rules:
    - name: block-flux-v1
      match:
        any:
          - resources:
              kinds:
                - Deployment
                - CronJob
                - Job
                - StatefulSet
                - DaemonSet
                - Pod
      validate:
        message: Cannot use Flux v1 annotation.
        pattern:
          metadata:
            "=(annotations)":
              X(fluxcd.io/*): "*?"