This file is indexed.

/lib/systemd/system/pppd-dns.service is in ppp 2.4.7-2+2ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Unit]
Description=Restore /etc/resolv.conf if the system crashed before the ppp link was shut down

[Service]
Type=oneshot
ExecStart=/etc/ppp/ip-down.d/0000usepeerdns

[Install]
WantedBy=multi-user.target