/lib/udev/rules.d/85-dmraid.rules is in dmraid 1.0.0.rc16-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # This file causes drives with dmraid arrays to be checked, and if all
# drives are present, brought up.
# See udev(8) for syntax
SUBSYSTEM=="block", ACTION=="add|change", ENV{ID_TYPE}=="disk", ENV{ID_FS_USAGE}=="raid", KERNEL=="hd[a-z]|sd[a-z]", \
RUN+="/sbin/dmraid-activate %k"
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