apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: require-resource-limits
  annotations:
    policies.kyverno.io/title: "Обязательные resource limits"
    policies.kyverno.io/category: Resources
    policies.kyverno.io/severity: high
    policies.kyverno.io/subject: Pod
    policies.kyverno.io/description: >-
      Каждый контейнер (включая init и ephemeral) обязан иметь
      limits.memory и limits.cpu. Без лимитов контейнер может
      потребить все ресурсы ноды и убить соседей (noisy neighbor).
spec:
  validationFailureAction: Enforce
  background: true
  rules:
  - name: check-container-limits
    match:
      resources:
        kinds:
        - Pod
    exclude:
      resources:
        namespaces:
        - kube-system
        - kyverno
    validate:
      message: >-
        Контейнер '{{ element.name }}' в поде '{{ request.object.metadata.name }}'
        (namespace: {{ request.object.metadata.namespace }}) не имеет resource limits.

        Добавьте в манифест:
          resources:
            limits:
              memory: "256Mi"
              cpu: "500m"

        Документация: https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/
      foreach:
      - list: >-
          request.object.spec.containers[] |
          merge(request.object.spec.initContainers[] || `[]`, @) |
          merge(request.object.spec.ephemeralContainers[] || `[]`, @)
        pattern:
          resources:
            limits:
              memory: "?*"
              cpu: "?*"