The transport drone network is great, unfortunately it lowers visibility of how much stuff is available if you compare it to a main bus belt. So it can easily happen that you don't really see a shortage until it is too late.

We already have a nice GUI to see the whole network, so you can manually check the stock levels. However, it would be nice to define alarms for when a resource drops below a certain amount for 30 seconds or so. This way we could get notified if our ore supply runs out, or if there is some other problem that halted production or that production is simply to low to keep up.

It could be done with the circuit network if it would be available as discussed here https://mods.factorio.com/mod/Transport_Drones/discussion/5ea9459eccd20c000dbc3065