Helm stable/nginx-ingress with autoscaling, HPA couldn't read CPU or memory metrics

Question

I install the latest version (1.24.5) of stable/nginx-ingress with autoscaling: true on a GKE cluster.

After finish deploying, HPA said that unable to read all metrics.

Can you help me to debug and fix it? If there is any more detail/log do you need, please kindly ask and I will provide it!

Thank you

Update:

• I can run other HPA perfectly

• kubectl get hpa returns

  unknown/100m for CPU

  unknown/100Mi for RAM

Answer 1

It seems that since the HPA that is created by enabling the autoscaler on the ingress controller, it will apply the HPA on the label app=nginx-ingress. The nginx-ingress default-backend also has the same label, and thus also requires us to define the CPU/memory resource requests/limits as well.

You can find more info in this GitHub issue