Add alerta to prometheus

Change-Id: I0349936dc683475e18155cf5f8ca750d06482cfb
diff --git a/metadata/service/alerta/init.yml b/metadata/service/alerta/init.yml
new file mode 100644
index 0000000..97ab144
--- /dev/null
+++ b/metadata/service/alerta/init.yml
@@ -0,0 +1,9 @@
+applications:
+  - prometheus
+classes:
+ - service.prometheus.support
+parameters:
+  prometheus:
+    alerta:
+      enabled: true
+      config_dir: /srv/volumes/local/alerta