Where is Stats.pm (errlog) ?

=== cut of errlog.html ===
<cpanel Stats="errlog($CPDATA{'DNS'})">
====================

=== cut of perlapi.txt ====
Cpanel/Stats.pm: errlog
Cpanel/Stats.pm- if ( !main::hasfeature("errlog") ) return (); }
====================

[root@cp1 cpanel]# ls -l /usr/local/cpanel/Cpanel | grep Stats.pm
[root@cp1 cpanel]#

I.e. module Stats.pm not exist.
Tool "Error log" looks good...
Where is function "errlog"???