/usr/share/doc/libpfm4-dbg/changelog.Debian.gz is in libpfm4-dbg 4.4.0+git47-g71166e2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libpfm4-dbg/../libpfm4/changelog.Debian.gz
/usr/share/doc/libpfm4-dbg/../libpfm4/changelog.Debian.gz