/etc/jabberd2/jabberd-router.conf is in jabberd2 2.4.0-3+deb9u1.
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 | description "jabberd Router component"
start on runlevel [2345]
stop on runlevel [!2345]
respawn
exec sudo -u jabber /usr/sbin/jabberd2-router
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