warn() Function

The warn() function will print warnings to the client. Warnings from webhooks are a feature introduced in Kubernetes version v1.19, so for clusters below this version, the function has no effect. You can call this function multiple times to print multiple warnings.

Example

apiVersion: policy.jspolicy.com/v1beta1

kind: JsPolicy

metadata:

name: "warn.example.com"

spec:

operations: ["CREATE", "UPDATE"]

resources: ["configmaps"]

javascript: |

// warn() will print a warning to the client. If warn() is called multiple times, it will print multiple warnings

// Warnings are a feature of kubernetes since v1.19 and could look like this:

//

// kubectl create -f my-configmap.yaml

// Warning: [warn.example.com]: Hello This Is A Warning for ConfigMap default/my-configmap

// Warning: [warn.example.com]: Hello This Is Another Warning

// configmap "my-configmap" created

//

warn(`Hello This Is A Warning for ConfigMap ${request.object.metadata.namespace}/${request.object.metadata.name}`);

// print another warning to the client

warn("Hello This Is Another Warning");