This file is indexed.

/lib/systemd/system/alsa-restore.service is in alsa-utils 1.1.3-1ubuntu1.

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

The actual contents of the file can be viewed below.

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#
# Note that two different ALSA card state management schemes exist and they
# can be switched using a file exist check - /etc/alsa/state-daemon.conf .
#

[Unit]
Description=Save/Restore Sound Card State
Documentation=man:alsactl(1)
ConditionPathExists=!/etc/alsa/state-daemon.conf
ConditionPathExistsGlob=/dev/snd/control*
After=alsa-state.service

[Service]
Type=oneshot
RemainAfterExit=true
ExecStartPre=/bin/mkdir -p /run/alsa
ExecStart=-/usr/sbin/alsactl -E HOME=/run/alsa restore
ExecStop=-/usr/sbin/alsactl -E HOME=/run/alsa store