This article describes the logging capabilities of the ADC appliance and how to rotate the logs generated by the system, including the syslog file (/var/log/ns.log).
The ADC appliance generates logs in multiple directories and in various formats. Some of these logs are not rotated by default and can grow in size consuming too much disk space. By using the included utilities for log rotation (newsyslog), you can manage these logs consistently, keeping only relevant information for easier management and administration.
Refer to the Citrix Documentation for detailed information: https://docs.citrix.com/en-us/citrix-adc/13/system/troubleshooting-citrix-adc/how-to-configure-log-file-rotation.html
Refer to the main page for the newsyslog command under the FreeBSD documentation for more information.