add extra tag mesh config (#8376)

* add extra tag mesh config

* fix

content/en/docs/tasks/observability/metrics/customize-metrics/index.md

@@ -139,6 +139,16 @@ the example application throughout this task.
             sidecar.istio.io/extraStatTags: destination_port,request_host
     {{< /text >}}
 
+    To enable extra tags mesh wide, you can add `extraStatTags` to your mesh config:
+
+    {{< text yaml >}}
+    meshConfig:
+      defaultConfig:
+        extraStatTags:
+         - destination_port
+         - request_host
+    {{< /text >}}
+
 ## Verify the results
 
 Send traffic to the mesh. For the Bookinfo sample, visit `http://$GATEWAY_URL/productpage` in your web

content/en/docs/tasks/observability/metrics/customize-metrics/snips.sh

@@ -87,6 +87,14 @@ spec:
         sidecar.istio.io/extraStatTags: destination_port,request_host
 ENDSNIP
 
+! read -r -d '' snip_enable_custom_metrics_4 <<\ENDSNIP
+meshConfig:
+  defaultConfig:
+    extraStatTags:
+     - destination_port
+     - request_host
+ENDSNIP
+
 snip_verify_the_results_1() {
 curl "http://$GATEWAY_URL/productpage"
 }