/usr/share/lintian/overrides/syslog-ng-mod-mongodb is in syslog-ng-mod-mongodb 3.5.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # These are ignored due to a Lintian bug: #727683
syslog-ng-mod-mongodb: binary-or-shlib-defines-rpath usr/lib/syslog-ng/* *
|