This error occurs when trying to create a Kubernetes resource of a type that is not available or registered in the API server, typically due to missing CRD or unsupported API version.
The "Kind not registered" error indicates that the resource type (Kind) you're trying to create doesn't exist or isn't available.
kubectl apply -f resource.yaml
kubectl api-resources
kubectl apply -f crds.yaml
cat resource.yaml | grep apiVersion && kubectl api-versions | grep <group>
Common API migrations: extensions/v1beta1 → apps/v1, apps/v1beta1 → apps/v1.
kubectl get pods --all-namespaces | grep -i operator