Add remote_agent

Change-Id: Id60781fb7e90a45cf19a9dce1288e1c6ce44beac
diff --git a/prometheus/server/target/dns.yml b/prometheus/server/target/dns.yml
index 7bbf92e..ed6602d 100644
--- a/prometheus/server/target/dns.yml
+++ b/prometheus/server/target/dns.yml
@@ -20,3 +20,8 @@
               - 'tasks.monitoring_alertmanager'
               type: A
               port: ${prometheus:alertmanager:bind:port}
+            - name: 'remote_agent'
+              domain:
+              - 'tasks.monitoring_remote_agent'
+              type: A
+              port: ${telegraf:remote_agent:output:prometheus_client:bind:port}