How to Log Messages From The LTM Log to remote syslog server

We have an 2000 series F5 HA Cluster running v13.1.0.8 build 0.0.3. One of our Linux admins built a Graylog cluster so all our Admins can send their logs to the Graylog server cluster. The linux admin wants me to front end the graylog cluster on the F5. I was able to create a VS for the Graylog server Web Portal and also created a VS for UDP 5140 that will send log messages to port 5140 on the Graylog Cluster.

However I can't get the F5 /var/log/LTM messages to be sent to the Graylog Server Cluster through the F5 VS. I added the Graylog VS ip address to the F5 Remote Syslog Server list. I also configured the High speed Logging settings on the F5 with the Graylog VS ip address. However all I see in the Graylog Web Portal are monitoring messages from the F5.

Any ideas?