Removing labels or annotations from K8s objects using Ansible

Just a small little trick worth recording. To remove a label, annotation, or likely any other key from a Kubernetes object using Ansible’s k8s module, you must set that key to NULL.

    - name: Remove Annotation Blah
      k8s:
       api_key: ""
       state: present
       definition:
         apiVersion: v1
         kind: Node
         metadata:
           name: varda.private.opequon.net
           annotations:
             blah: NULL

The above snippet removes the blah annotation from this node object.

Certainly not intuitive…took me a good day or two of searching when I need this last year.