Azure Service Bus Scaler - unable to fetch metrics from external metrics API

[conradj3]

Hi All,

I was working with Azure Service Bus Scaler in an Azure Kubernetes Environment. I received an error using a connectionFromEnv approach. Below is the error received from the HPA event.

HPA Event Error

Events:
  Type     Reason                   Age                     From                       Message
  ----     ------                   ----                    ----                       -------
  Warning  FailedGetExternalMetric  80s (x1609 over 6h51m)  horizontal-pod-autoscaler  unable to get external metric keda-example/s0-azure-servicebus-keda-queue/&LabelSelector{MatchLabels:map[string]string{scaledobject.keda.sh/name: azure-servicebus-queue-scaledobject,},MatchExpressions:[]LabelSelectorRequirement{},}: unable to fetch metrics from external metrics API: rpc error: code = Unknown desc = error when getting metric values no matching metrics found for s0-azure-servicebus-keda-queue

I had a Deployment, ScaledObject, Service, and Secret manifest. For consistency, I used the label app:go-consumer for each manifest. Once the labels were added, calls to the metrics server and scale the deployment. I didn't see anything in the documentation on the required labeling. Looking for some insight if the docs should be updated.