/usr/ is in rt4-extension-nagios 1.01-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/request-tracker4/
/usr/share/request-tracker4/plugins/
/usr/share/request-tracker4/plugins/RT-Extension-Nagios/
/usr/share/request-tracker4/plugins/RT-Extension-Nagios/lib/
/usr/share/request-tracker4/plugins/RT-Extension-Nagios/lib/RT/
/usr/share/request-tracker4/plugins/RT-Extension-Nagios/lib/RT/Action/
/usr/share/request-tracker4/plugins/RT-Extension-Nagios/lib/RT/Action/UpdateNagiosTickets.pm
/usr/share/request-tracker4/plugins/RT-Extension-Nagios/lib/RT/Extension/
/usr/share/request-tracker4/plugins/RT-Extension-Nagios/lib/RT/Extension/Nagios.pm
/usr/share/request-tracker4/plugins/RT-Extension-Nagios/etc/
/usr/share/request-tracker4/plugins/RT-Extension-Nagios/etc/initialdata
/usr/share/doc/
/usr/share/doc/rt4-extension-nagios/
/usr/share/doc/rt4-extension-nagios/copyright
/usr/share/doc/rt4-extension-nagios/changelog.Debian.gz
/usr/share/man/
/usr/share/man/man3/
/usr/share/man/man3/RT::Extension::Nagios.3pm.gz