Add alerta UI for prometheus alerts

This change add new service with:
* The new service in monitoring stack: Alerta UI
* Nginx proxy entity for Alerta UI
* Relabeling for prometheus alerts
* New webhook receiver

Change-Id: Id042f2fa04a5881cd48265fa6e7a327237024acc
Prod-related: PROD-19597
diff --git a/prometheus/alertmanager/notification/alerta.yml b/prometheus/alertmanager/notification/alerta.yml
new file mode 100644
index 0000000..816aaf6
--- /dev/null
+++ b/prometheus/alertmanager/notification/alerta.yml
@@ -0,0 +1,20 @@
+parameters:
+  _param:
+    alertmanager_notification_alerta_host: alerta
+    alertmanager_notification_alerta_port: 8080
+  prometheus:
+    alertmanager:
+      enabled: true
+      config:
+        route:
+          routes:
+            alerta:
+              receiver: HTTP-alerta
+              continue: true
+        receiver:
+          HTTP-alerta:
+            enabled: true
+            webhook_configs:
+              alerta:
+                url: "http://${_param:alertmanager_notification_alerta_host}:${_param:alertmanager_notification_alerta_port}/api/webhooks/prometheus"
+                send_resolved: true