When trying to test out a MultidimPodAutoscaler in a GKE Cluster running 1.20.8-gke.900:

apiVersion: autoscaling.gke.io/v1beta1
kind: MultidimPodAutoscaler
...

I get the following helm error:

Error: UPGRADE FAILED: unable to recognize "": no matches for kind "MultidimPodAutoscaler" in version "autoscaling.gke.io/v1beta1"

Looking into it further:

kubectl explain MultidimPodAutoscaler

Basically confirms it doesn't seem to exist:

the server doesn't have a resource type "MultidimPodAutoscaler"

and running:

kubectl api-versions

Does not even list autoscaling.gke.io/v1beta1 as an available API.

From my understanding, GKE added MultidimPodAutoscaler in 1.19.4-gke.1700 so I was expecting it to be available.

https://cloud.google.com/kubernetes-engine/docs/how-to/multidimensional-pod-autoscaling

Any help understanding what I am missing would be much appreciated.