Exessive logging when Config Utility is accessed

I have setup an external log server and pointed one of my BIGIP VEs to use it. The idea is to log management logins and other local activities, not related to TMM. Whenever someone is logged in to the Config Utility the BIGIP starts logging pretty much in an endless loop, although I do not click around in the GUI. I get about 40 log messages (informational) every minute, like this:

bigip1 info logger: [ssl_req][10/Jan/2019:10:22:16 +0100] 192.168.14.53 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 "/xui/update/configuration/alert/statusmenu/coloradvisory" 1952

When I close the web browser the logging stops completely. So, two-part question:

1. Is there a way to either get rid of what seems to me like an unnecessary loop of log messages, or lower the log level?

2. Can you use a log filter to solve this or is that for HSL only? Any best practice on this?

The logs are sent to a remote graylog server configured in

System  ››  Logs : Configuration : Remote Logging

. The only thing there is the IP of the server and port 514 configured. When I look though the logging level options under

System  ››  Logs : Configuration : Options

There is nothing set to Level 6 / informational there and I have not found any other options for this.

BIGIP version is BIG-IP v13.1.1.2 (Build 0.0.4)