Check for authentication error

Signed-off-by: Rick Brouwer <[email protected]>

CHANGELOG.md

@@ -72,7 +72,6 @@ Here is an overview of all new **experimental** features:
 - **AWS CloudWatch Scaler**: Add support for ignoreNullValues ([#5352](https://github.com/kedacore/keda/issues/5352))
 - **GCP Scalers**: Added custom time horizon in GCP scalers ([#5778](https://github.com/kedacore/keda/issues/5778))
 - **GitHub Scaler**: Fixed pagination, fetching repository list ([#5738](https://github.com/kedacore/keda/issues/5738))
-- **IBMMQ Scaler**: Support multiple queues at the IBMMQ scaler ([#6181](https://github.com/kedacore/keda/issues/6181))
 - **Kafka**: Fix logic to scale to zero on invalid offset even with earliest offsetResetPolicy ([#5689](https://github.com/kedacore/keda/issues/5689))
 - **RabbitMQ Scaler**: Add connection name for AMQP ([#5958](https://github.com/kedacore/keda/issues/5958))
 - TODO ([#XXX](https://github.com/kedacore/keda/issues/XXX))

pkg/scalers/ibmmq_scaler.go

@@ -150,6 +150,10 @@ func (s *ibmmqScaler) getQueueDepthViaHTTP(ctx context.Context) (int64, error) {
 		}
 		defer resp.Body.Close()
 
+		if resp.StatusCode == http.StatusUnauthorized {
+			return 0, fmt.Errorf("authentication failed: incorrect username or password")
+		}
+
 		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return 0, fmt.Errorf("failed to read body of request for queue %s: %w", queueName, err)