/usr/share/perl5/Munin/Master/ is in munin 1.4.6-3ubuntu3.4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Munin/Master/Config.pm
/usr/share/perl5/Munin/Master/GraphOld.pm
/usr/share/perl5/Munin/Master/Group.pm
/usr/share/perl5/Munin/Master/GroupRepository.pm
/usr/share/perl5/Munin/Master/HTMLOld.pm
/usr/share/perl5/Munin/Master/Host.pm
/usr/share/perl5/Munin/Master/LimitsOld.pm
/usr/share/perl5/Munin/Master/Logger.pm
/usr/share/perl5/Munin/Master/Node.pm
/usr/share/perl5/Munin/Master/ProcessManager.pm
/usr/share/perl5/Munin/Master/Update.pm
/usr/share/perl5/Munin/Master/UpdateWorker.pm
/usr/share/perl5/Munin/Master/Utils.pm
/usr/share/perl5/Munin/Master/Worker.pm