If it's a stand alone hot tub there is no off the shelf way to monitor it. Jandy/aqualink units are made for built in tubs and pools with outboard pumps and equipment. The best you can do is tape a temperature sensor onto one of the pipes inside the unit and wrap it in insulation and then connect that to an alarm panel or automation system that can send out alerts. You could also attach a current sensor to the power lead into the tub unit to monitor that it is receiving power.

I lived in a house with a hot tub for a few years and it never tripped a breaker.. This was in the era before arc fault breakers though. Having it on an arc fault doesn't seem right though.