System Updates FreePBX 17

I noticed there isn’t any option in Admin->Module Admin->Scheduler and Alerts to configure automatic system updates. Will this option be added in the future ?

Can’t speak to what feature set will be available once 17 is fully released but since it’s meant to run on vanilla Debian you should be able to just use whatever Debian uses for system updates. We typically use UnattendedUpgrades to handle updates to Debian itself with any Debian system that’s deployed and managed by us:

https://wiki.debian.org/UnattendedUpgrades

A cautious person might want to

dpkg-reconfigure apt-listchanges

to get emails about possible changes before allowing unattended upgrades