/usr/share/doc/ndoutils-nagios3-mysql/changelog.Debian.gz is in ndoutils-nagios3-mysql 1.4b9-1.1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/ndoutils-nagios3-mysql/../ndoutils-common/changelog.Debian.gz