Exclude Prometheus traffic in rule so that Kiali does not show it. (istio#12251)

Author: pilhuhn

install/kubernetes/helm/istio/charts/mixer/templates/config.yaml

@@ -847,7 +847,7 @@ metadata:
     heritage: {{ .Release.Service }}
     release: {{ .Release.Name }}
 spec:
-  match: (context.protocol == "http" || context.protocol == "grpc") && (match((request.useragent | "-"), "kube-probe*") == false)
+  match: (context.protocol == "http" || context.protocol == "grpc") && (match((request.useragent | "-"), "kube-probe*") == false) && (match((request.useragent | "-"), "Prometheus*") == false)
   actions:
   - handler: prometheus
     instances:

mixer/testdata/config/prometheus.yaml

@@ -206,7 +206,7 @@ metadata:
   name: promhttp
   namespace: istio-system
 spec:
-  match: (context.protocol == "http" || context.protocol == "grpc") && (match((request.useragent | "-"), "kube-probe*") == false)
+  match: (context.protocol == "http" || context.protocol == "grpc") && (match((request.useragent | "-"), "kube-probe*") == false) && (match((request.useragent | "-"), "Prometheus*") == false)
   actions:
   - handler: prometheus
     instances: