I am trying to achieve Horizontal Pods Autoscaling (HPA) in GCP based on GPU utilization. My hpa.yaml file looks like this:

kind: HorizontalPodAutoscaler
metadata:
  name: my-hpa
spec:
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: External
    external:
     metricName: kubernetes.io|container|accelerator|duty_cycle
      targetAverageValue: 10
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: my-container-worker

After I run kubectl create -f hpa.yaml , I see the following error in the GCP.

On the HPA, it says unable to read all metrics.

In stack driver monitoring I have created a dashboard with the metric mentioned above.

Has anyone come across this issue?