/usr/share/aide/config/aide/aide.conf.d/31_aide_nagios2 is in aide-common 0.16~a2.git20130520-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | /var/cache/nagios2/(objects\.cache|status\.dat)$ VarFile
/var/lib/nagios2/(comments|retention)\.dat$ VarFile
/var/lib/nagios2/rw/nagios\.cmd$ VarFile
/var/lib/nagios2/rw$ VarDir
/var/log/nagios2/nagios\.log$ LowLog
/var/log/nagios2/archives/nagios-[01][0-9]-[0123][0-9]-@@{YEAR4D}-00\.log$ SerMemberDELog
/@@{RUN}/nagios2/nagios2\.pid$ VarFile
/var/(cache|lib|log)/nagios2$ VarDir
/@@{RUN}/nagios2$ VarDirInode
/var/log/nagios2/archives$ VarDir
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