Add labels_add parameter for prometheus

Change-Id: Iae4e3d89395f19ba407b3d82e90cc77156331757
Depends-On: I0b21d8a9695e8a15d0d6b80e6ddd0476682c80c2
diff --git a/prometheus/server/alert/labels_add/route.yml b/prometheus/server/alert/labels_add/route.yml
new file mode 100644
index 0000000..47d9eea
--- /dev/null
+++ b/prometheus/server/alert/labels_add/route.yml
@@ -0,0 +1,9 @@
+parameters:
+  _param:
+    prometheus_server_alert_label_route: mail
+  prometheus:
+    server:
+      config:
+        alert:
+          labels_add:
+            route: ${_param:prometheus_server_alert_label_route}