/etc/init/udevmonitor.conf is in udev 215-17+deb8u7.
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 7 8 9 10 11 12 13 | # udevmonitor - log initial device creation
#
# The set of devices created in the "cold plug" pass is generally
# useful for debugging, so we monitor this and create a log file
# from that.
description "log initial device creation"
start on (startup
and starting udevtrigger)
stop on stopped udevtrigger
exec /sbin/udevadm monitor -e >/dev/.udev.log
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