/usr/share/gosa/plugins/ is in gosa-plugin-dns 2.7.4+reloaded2-9ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gosa/plugins/admin/
/usr/share/gosa/plugins/admin/systems/
/usr/share/gosa/plugins/admin/systems/services/
/usr/share/gosa/plugins/admin/systems/services/dns/
/usr/share/gosa/plugins/admin/systems/services/dns/class_DNS.inc
/usr/share/gosa/plugins/admin/systems/services/dns/class_servDNS.inc
/usr/share/gosa/plugins/admin/systems/services/dns/class_servDNSeditZone.inc
/usr/share/gosa/plugins/admin/systems/services/dns/class_servDNSeditZoneEntries.inc
/usr/share/gosa/plugins/admin/systems/services/dns/servDNSeditZoneEntries.tpl
/usr/share/gosa/plugins/admin/systems/services/dns/servdns.tpl
/usr/share/gosa/plugins/admin/systems/services/dns/servdnseditzone.tpl