Add sf-notifier monitoring:

- add alerts for checking service health
- add Prometheus dns target
- add fluentd configuration

Change-Id: Id61f613cf3d853d1a37b0834ab6149fb2e9b10b5
Related-bug: PROD-25099 (PROD:25099)
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index e4d3cb4..bbbbf18 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -7,3 +7,5 @@
         enabled: true
       telegraf:
         enabled: true
+      fluentd:
+        enabled: true