This file is indexed.

/etc/update-motd.d/97-overlayroot is in overlayroot 0.40ubuntu1.

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

(egrep "overlayroot|/media/root-ro|/media/root-rw" /proc/mounts 2>/dev/null | sort -r) || true
echo