I don't have a food computer, but have been growing microgreens and AeroGarden lettuce using monitoring software that I wrote. What I've found most useful to watch is a chart of the nutrient tank temperature compared to the ambient air temperature. I use it to decide when I should turn my fan on and off. Also, it's fascinating to watch how the indoor temperature changes over time. The big surprise for me was that the AeroGarden's power supply will heat the nutrient tank about 2 °C above ambient unless I have a fan pointed at it to increase the air circulation.
The other main things I check are water level (every day), leaves that I should harvest (every day), and adding or changing nutrients (every two weeks). So far I don't have anything automatic for that. I'm thinking about, what if I could say, "Alexa, how are my plants?" and get replies like "you need to add water", "you need to change the nutrient solution tomorrow", or "you should probably turn on the fan". Most of that wouldn't make sense for a PFC2, and I don't think the CouchDB api exposes that level of abstraction. But, at a more general level, it would be to cool to get a summary including any exceptional conditions that need immediate attention along with reminders about upcoming tasks I need to do.
You mentioned that you're using your PFC. What are you growing? How have you found yourself using the different voice commands? Have you learned anything surprising from that? How do you feel about using Alexa compared to the OpenAg web UI?