prometheus-operator/example/alertmanager-crd-conversion/patch.json

{
   "apiVersion": "apiextensions.k8s.io/v1",
   "kind": "CustomResourceDefinition",
   "metadata": {
      "annotations": {
         "controller-gen.kubebuilder.io/version": "v0.19.0",
         "operator.prometheus.io/version": "0.89.0"
      },
      "name": "alertmanagerconfigs.monitoring.coreos.com"
   },
   "spec": {
      "conversion": {
         "strategy": "Webhook",
         "webhook": {
            "clientConfig": {
               "service": {
                  "name": "prometheus-operator-admission-webhook",
                  "namespace": "default",
                  "path": "/convert",
                  "port": 8443
               }
            },
            "conversionReviewVersions": [
               "v1beta1",
               "v1alpha1"
            ]
         }
      }
   }
}