Prometheus AMP scaler returning error : "Credential should be scoped to a valid region."

[sguruvar]

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Amazon Managed Prometheus (AMP) Scaler returning "Credential should be scoped to a valid region."
2024-01-19T22:35:52Z ERROR prometheus_scaler error executing prometheus query {"type": "ScaledObject", "namespace": "default", "name": "so", "error": "prometheus query api returned error. status: 403 response: {\"message\":\"Credential should be scoped to a valid region. \"}"} github.com/kedacore/keda/v2/pkg/scalers.(*prometheusScaler).GetMetricsAndActivity /workspace/pkg/scalers/prometheus_scaler.go:391

Expected Behavior

Root cause is that the AWS region is taken as empty

Actual Behavior

2024-01-19T22:35:52Z ERROR prometheus_scaler error executing prometheus query {"type": "ScaledObject", "namespace": "default", "name": "so", "error": "prometheus query api returned error. status: 403 response: {\"message\":\"Credential should be scoped to a valid region. \"}"} github.com/kedacore/keda/v2/pkg/scalers.(*prometheusScaler).GetMetricsAndActivity /workspace/pkg/scalers/prometheus_scaler.go:391

Steps to Reproduce the Problem

1. Take latest Keda core with helm v2.13.1
2. Try with the below podIdentity and scaledObject
3. You will see the error
   apiVersion: keda.sh/v1alpha1 kind: TriggerAuthentication metadata: name: keda-trigger-auth-aws-credentials spec: podIdentity: provider: aws

apiVersion: keda.sh/v1alpha1 kind: ScaledObject metadata: name: so spec: scaleTargetRef: apiVersion: apps/v1 kind: Deployment name: songinx cooldownPeriod: 1 fallback: failureThreshold: 3 replicas: 1 minReplicaCount: 1 maxReplicaCount: 30 advanced: horizontalPodAutoscalerConfig: behavior: scaleDown: stabilizationWindowSeconds: 15 triggers: - type: prometheus authenticationRef: name: keda-trigger-auth-aws-credentials metadata: serverAddress: https://aps-workspaces.us-east-2.amazonaws.com/workspaces/ws-d3284d62-5c77-4c0d-8095-7f752dd585dc metricName: s0-prometheus awsRegion: us-east-2 threshold: "10.0" query: vector(100) identityOwner: operator

Logs from KEDA operator

2024-01-19T22:35:52Z	ERROR	prometheus_scaler	error executing prometheus query	{"type": "ScaledObject", "namespace": "default", "name": "so", "error": "prometheus query api returned error. status: 403 response: {\"message\":\"Credential should be scoped to a valid region. \"}"}
github.com/kedacore/keda/v2/pkg/scalers.(*prometheusScaler).GetMetricsAndActivity
	/workspace/pkg/scalers/prometheus_scaler.go:391

KEDA Version

2.13.0

Kubernetes Version

1.27

Platform

Amazon Web Services

Scaler Details

Prometheus

Anything else?

No response