I also have a similar water feature with an autofill float valve and filled with my pressurized irrigation. I have not had any problems with my float valve, but could see that as a problem if I did. I turn on the water feature pump through my Rachio. The only ways that I can think of to help with a float valve issue early warning system might be putting on a flow sensor for that line before the float valve or some other type of sensor to tell when it is full or started to overflow. However, they do not tie into the Rachio system.
