I added the feature to check for a “heartbeat” from the sump pump device. I use the Zooz which is configurable as to how often it reports in so you have to be careful to select a window that will be larger than the worst possible reporting window. Each device is different though so you’ll just have to observe your device via the Live Logging to see what is routine and also accounting for the off chance of a missed message.
But, it works nicely once you get that figured out. I ended up going with 4 hours but might move it to 6 hours. The v2.4 code is up on GitHub.