Add graylog host marathon url as default

application.yml

@@ -54,6 +54,9 @@ logging:
     com.netflix: WARN
     org.springframework.cloud: WARN
 
+graylog:
+  host: logginggraylog.marathon.l4lb.thisdcos.directory
+
 # TODO: remove this 2 profiles below if done migrating to new environment
 ---
 spring: