This file is indexed.

/etc/kernel/postinst.d/apt-dater-host_reboot is in apt-dater-host 1.0.0-2+deb8u1.

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

touch /var/run/apt-dater-host_reboot