Bind9 Statistics
From: https://www.zytrax.com/books/dns/ch7/statistics.html





DNS BIND Statistics Statements

This section describes all the statements available in BIND 9.x named.conf 
relating to statistics. Full list of statements.



statistics-file [ statistics-file path_name; ] The pathname of the file the server appends statistics to when instructed to do so using rndc stats. If not specified, the default is named.stats in the server's current directory. This option may only be specified in a 'global' options statement.
zone-statistics [ zone-statistics yes | no ; ] If zone-statistics is 'yes', the server will collect statistical data on all zones (unless specifically turned off on a per-zone basis by specifying zone-statistics no in the zone statement). These statistics may be accessed using rndc stats, which will dump them to the file listed in the statistics-file options. This option may be specified in a zone or a 'global' options statement.