I'm trying the leader-election code example provided with the go client (here) in a GKE cluster v1.13.7.
That requires a resource of type Lease of groupVersion coordination.k8s.io/v1 but there isn't. I know that Lease has been promoted to v1 in k8s 1.14 (not yet available with gke), but I expected to find the v1beta1 version.
Try with
kubectl proxy
curl -X GET localhost:8001/apis/coordination.k8s.ioand I get 404 page not found
Although the feature is v1 in 1.14, GKE has not incorporated this feature yet. Since GKE is a fully managed product, the eng team decide which features to incorporate I to the GKE offering.
I recommend opening a feature request through the Google Public Issue Tracker and provide your use case for the feature to have integrated in future releases