/usr/share/perl5/ is in munin-node 2.0.25-1+deb8u3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Munin/
/usr/share/perl5/Munin/Node/
/usr/share/perl5/Munin/Node/SpoolReader.pm
/usr/share/perl5/Munin/Node/SpoolWriter.pm
/usr/share/perl5/Munin/Node/Configure/
/usr/share/perl5/Munin/Node/Configure/Debug.pm
/usr/share/perl5/Munin/Node/Configure/PluginList.pm
/usr/share/perl5/Munin/Node/Configure/History.pm
/usr/share/perl5/Munin/Node/Configure/Plugin.pm
/usr/share/perl5/Munin/Node/Configure/HostEnumeration.pm
/usr/share/perl5/Munin/Node/Utils.pm
/usr/share/perl5/Munin/Node/OS.pm
/usr/share/perl5/Munin/Node/Service.pm
/usr/share/perl5/Munin/Node/Session.pm
/usr/share/perl5/Munin/Node/Server.pm
/usr/share/perl5/Munin/Node/ProxySpooler.pm
/usr/share/perl5/Munin/Node/Logger.pm
/usr/share/perl5/Munin/Node/SNMPConfig.pm
/usr/share/perl5/Munin/Node/Config.pm