This article list the predefined setting values configured on NetScaler MAS.
You can specify the number of days after which the following syslog data will be deleted from the NetScaler Unified Management System server.
Retain Syslog Generic Data is default 15 days
Retain AppFirewall Data is default 15 days
Retain NetScaler Gateway Data is default 15 days
You can also configure purging interval(days) for NetScaler Gateway Syslog messages. There are various type of pruning available for Example (ica proxy session start / session end / HTTP request / License limit reached / Login-Logout of users) have default 15 days interval before purge.
You can limit the number of days for which the generated reports can persist in the database, after which the reports are permanently deleted. Duration for data to persist (2 - 31 days). Default value is 31 days.
The above field which is seen below System > Change Data Record > Data Duration Persistency Settings would be removed in the later versions of 12.X