This file is indexed.

/etc/init/udevtrigger.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.

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# udevtrigger - cold plug devices
#
# By the time udevd starts, we've already missed all of the events for
# the devices populated in /sys.  This task causes the kernel to resend
# them.

description	"cold plug devices"

start on (startup
	  and started udev
	  and not-container)

task

exec udevadm trigger --action=add
post-stop exec udevadm settle