/etc/init/svscan.conf is in daemontools-run 1:0.76-3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # svscan - daemontools
#
# This service starts daemontools from the point the system is
# started until it is shut down again.
start on filesystem
stop on runlevel [06]
respawn
exec /usr/bin/svscanboot
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