Since Adam is constantly monitoring all their boxes, it would be nice to send an sms to admins when the connection is lost from gateway to internet.
SMS on failed ping
Zabbix is a great solution to monitor pfsense uptime among other options memory usage cpu etc, there is a package in pfsense available. You would however need to run a zabbix server.
Can we get a screenshot of what data you get on your end from Zabbix?