/usr/share/doc/rrdtool-dbg/NEWS.Debian.gz is in rrdtool-dbg 1.4.7-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/rrdtool-dbg/../librrd4/NEWS.Debian.gz
/usr/share/doc/rrdtool-dbg/../librrd4/NEWS.Debian.gz