/usr/lib/dracut/modules.d/90mdraid/mdmon-pre-udev.sh is in dracut-core 047-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
# save state dir for mdmon/mdadm for the real root
[ -d /run/mdadm ] || mkdir -m 0755 /run/mdadm
# backward compat link
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