Configure connectivity between keda & custom prometheus stack

scale-to-zero-with-keda/README.md

@@ -34,6 +34,8 @@ Make sure Istio sidecar injection is enabled in the target Namespace:
 kubectl label namespace default istio-injection=enabled
 ```
 
+Edit `k8s-resources/scalable-worker-fn.yml` and `k8s-resources/peer-authentication.yaml` files to fill in the namespace value (namespace where prometheus was deployed).
+
 Apply the example resources from `./k8s-resources` directory:
 ```bash
 kubectl apply -f ./k8s-resources

scale-to-zero-with-keda/k8s-resources/peer-authentication.yaml

@@ -0,0 +1,8 @@
+apiVersion: security.istio.io/v1beta1
+kind: PeerAuthentication
+metadata:
+  name: default
+  namespace: {prometheus-namespace}
+spec:
+  mtls:
+    mode: PERMISSIVE

scale-to-zero-with-keda/k8s-resources/scalable-worker-fn.yml

@@ -37,7 +37,7 @@ spec:
   triggers:
   - type: prometheus
     metadata:
-      serverAddress: http://prometheus-operated.kyma-system.svc.cluster.local:9090
+      serverAddress: http://prometheus-operated.{prometheus-namespace}.svc.cluster.local:9090
       query: sum(rate(istio_requests_total{destination_service="scalable-worker-fn.default.svc.cluster.local",reporter="source"}[1m]))
       threshold: '2'