/var/lib/cobbler/triggers/delete/ is in maas-provision-common 2.2.2-0ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/var/lib/cobbler/triggers/delete/distro/
/var/lib/cobbler/triggers/delete/distro/post/
/var/lib/cobbler/triggers/delete/distro/pre/
/var/lib/cobbler/triggers/delete/file/
/var/lib/cobbler/triggers/delete/file/post/
/var/lib/cobbler/triggers/delete/file/pre/
/var/lib/cobbler/triggers/delete/mgmtclass/
/var/lib/cobbler/triggers/delete/mgmtclass/post/
/var/lib/cobbler/triggers/delete/mgmtclass/pre/
/var/lib/cobbler/triggers/delete/package/
/var/lib/cobbler/triggers/delete/package/post/
/var/lib/cobbler/triggers/delete/package/pre/
/var/lib/cobbler/triggers/delete/profile/
/var/lib/cobbler/triggers/delete/profile/post/
/var/lib/cobbler/triggers/delete/profile/pre/
/var/lib/cobbler/triggers/delete/repo/
/var/lib/cobbler/triggers/delete/repo/post/
/var/lib/cobbler/triggers/delete/repo/pre/
/var/lib/cobbler/triggers/delete/system/
/var/lib/cobbler/triggers/delete/system/post/
/var/lib/cobbler/triggers/delete/system/pre/