/etc/cron.daily/mdadm is in mdadm 3.2.5-5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #!/bin/sh
#
# cron.daily/mdadm -- daily check that MD devices are functional
#
# Copyright © 2008 Paul Slootman <paul@debian.org>
# distributed under the terms of the Artistic Licence 2.0
# As recommended by the manpage, run
# mdadm --monitor --scan --oneshot
# every day to ensure that any degraded MD devices don't go unnoticed.
# Email will go to the address specified in /etc/mdadm/mdadm.conf .
#
set -eu
MDADM=/sbin/mdadm
[ -x $MDADM ] || exit 0 # package may be removed but not purged
exec $MDADM --monitor --scan --oneshot
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