post_upgrade() {
    cat <<__EOF__

The turnserver configuration has changed.
Please check the wiki: https://wiki.archlinux.org/index.php/Jitsi-meet
And check the example provided in:
/usr/share/doc/jitsi-meet-prosody/prosody.cfg.lua-jvb.example

You need to replace the turncredentials with external_services.

__EOF__
}