error: the namespace from the provided object 'kube-system' does not match the namespace 'custom-metrics'. You must pass '--namespace=kube-system' to perform this operation.

[ragatgen]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Followed the instructions on
https://docs.microsoft.com/en-us/azure/application-gateway/ingress-controller-autoscale-pods

Expected behavior
Deploy the adapter

Kubernetes version (kubectl version):

Kubernetes Version	1.18.8

Logs (kubectl logs <metric adapter pod id>)
no pod created

Additional context
When applying this steps:
kubectl create namespace custom-metrics

use values from service principal created above to create secret

kubectl create secret generic azure-k8s-metrics-adapter -n custom-metrics
--from-literal=azure-tenant-id=
--from-literal=azure-client-id=
--from-literal=azure-client-secret=
kubectl apply -f kubectl apply -f https://raw.githubusercontent.com/Azure/azure-k8s-metrics-adapter/master/deploy/adapter.yaml -n custom-metrics
The following comes out at the end:

error: the namespace from the provided object 'kube-system' does not match the namespace 'custom-metrics'. You must pass '--namespace=kube-system' to perform this operation.

Please let me know if there's anything else to be done to get this working

[jsturtevant]

Support for newer versions of k8s has not been added or tested (see maintenance note). Please checkout out KEDA which has Azure metric support for latest updates