This file is indexed.

/usr/lib/update-notifier/update-motd-reboot-required is in update-notifier-common 3.192.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh -e
#
# helper for update-motd

if [ -f /var/run/reboot-required ]; then
	cat /var/run/reboot-required
fi