Thanks for that link. It helps to know others are baffled here 
If I can find some time soon, I’ll see if I can read the pulses on the meter with an esp32 and collect some data to see if I can correlate “low flow” alarms with meter readings. Maybe more data will help us figure this out.
Either way, I’ll probably be filtering flow alert emails to the trash until this resolves, and that gives me a little sadness because part of the reason I wanted a Rachio was flow monitoring.
To put a bit of extra data into this thread:
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The total flow measured seems correct because it matches the estimated flow I calculated when planning the drip irrigation system.
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I’m not yet convinced wiring is the problem as mentioned on the linked thread, which seems to infer that the problem could be electrical noise on the flow wires over a long distance run. My flow meter is less than 3ft (by wire) from the Rachio.