Forbid CPU Limits

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: forbid-cpu-limits
  annotations:
    policies.kyverno.io/title: Forbid CPU Limits
    policies.kyverno.io/category: Other
    policies.kyverno.io/subject: Pod
    kyverno.io/kyverno-version: 1.10.0
    kyverno.io/kubernetes-version: "1.26"
    policies.kyverno.io/description: Setting of CPU limits is a debatable poor practice as it can result, when defined, in potentially starving applications of much-needed CPU cycles even when they are available. Ensuring that CPU limits are not set may ensure apps run more effectively. This policy forbids any container in a Pod from defining CPU limits.
spec:
  background: true
  validationFailureAction: Enforce
  rules:
    - name: check-cpu-limits
      match:
        any:
          - resources:
              kinds:
                - Pod
      validate:
        message: Containers may not define CPU limits.
        pattern:
          spec:
            containers:
              - (name): "*"
                "=(resources)":
                  "=(limits)":
                    X(cpu): null