/usr/lib/drbd/ is in drbd8-utils 2:8.4.4-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/drbd/crm-fence-peer.sh
/usr/lib/drbd/crm-unfence-peer.sh
/usr/lib/drbd/notify-emergency-reboot.sh
/usr/lib/drbd/notify-emergency-shutdown.sh
/usr/lib/drbd/notify-io-error.sh
/usr/lib/drbd/notify-out-of-sync.sh
/usr/lib/drbd/notify-pri-lost-after-sb.sh
/usr/lib/drbd/notify-pri-lost.sh
/usr/lib/drbd/notify-pri-on-incon-degr.sh
/usr/lib/drbd/notify-split-brain.sh
/usr/lib/drbd/notify.sh
/usr/lib/drbd/outdate-peer.sh
/usr/lib/drbd/rhcs_fence
/usr/lib/drbd/snapshot-resync-target-lvm.sh
/usr/lib/drbd/stonith_admin-fence-peer.sh
/usr/lib/drbd/unsnapshot-resync-target-lvm.sh