Newline character added to Prometheus Custom Auth #4960
Description
Report
It seems whenever using a secretRef with Prometheus CustomAuth auth type, a new line is either added or not removed from the actual values.
Expected Behavior
Using the below manifests, Keda should be able to retrieve metrics from Prometheus:
apiVersion: v1
items:
- apiVersion: keda.sh/v1alpha1
kind: ClusterTriggerAuthentication
metadata:
finalizers:
- finalizer.keda.sh
name: keda-prom-creds
spec:
secretTargetRef:
- key: PRIVATE_KEY
name: secret-keys
parameter: customAuthValue
- key: authToken
name: secret-keys
parameter: customAuthHeader
kind: List
where value is:
authToken: dG9rZW4K (== "token")
Actual Behavior
Keda operator fails with error: net/http: invalid header field name \"token\\n\"
2023-09-07T06:33:13Z ERROR scale_handler error getting metric for scaler {"scaledObject.Namespace": "hpa-tenant", "scaledObject.Name": "prometheus-so-test-metric", "scaler": "prometheusScaler", "error": "Get \"https://prom-server.com/api/v1/query?query=sum%28rate%28container_cpu_usage_seconds_total%7Bnamespace%3D~%22.%2Ahpa-tenant.%2A%22%2Ccontainer%3D%22dal%22%7D%5B5m%5D%29+%2F+%28kube_pod_container_resource_limits%7Bnamespace%3D~%22.%2Ahpa-tenant.%2A%22%2Ccontainer%3D%22dal%22%2Cresource%3D%22cpu%22%7D%29%29+by+%28container%2C+namespace%29+%2A+100&time=2023-09-07T06:33:13Z\": net/http: invalid header field name \"token\\n\""}
Steps to Reproduce the Problem
- Create a secret (in this example was created with ExternalSecrets)
- Reference the secret in TriggerAuthentication
Logs from KEDA operator
2023-09-07T06:33:13Z ERROR scale_handler error getting metric for scaler {"scaledObject.Namespace": "hpa-tenant", "scaledObject.Name": "prometheus-so-test-metric", "scaler": "prometheusScaler", "error": "Get \"https://prom-server.com/api/v1/query?query=sum%28rate%28container_cpu_usage_seconds_total%7Bnamespace%3D~%22.%2Ahpa-tenant.%2A%22%2Ccontainer%3D%22dal%22%7D%5B5m%5D%29+%2F+%28kube_pod_container_resource_limits%7Bnamespace%3D~%22.%2Ahpa-tenant.%2A%22%2Ccontainer%3D%22dal%22%2Cresource%3D%22cpu%22%7D%29%29+by+%28container%2C+namespace%29+%2A+100&time=2023-09-07T06:33:13Z\": net/http: invalid header field name \"token\\n\""}
KEDA Version
2.11.1
Kubernetes Version
1.27
Platform
Amazon Web Services
Scaler Details
Prometheus
Anything else?
No response