Sometimes (important) assembly-machines run out of raw-material, sometimes trains are stuck, sometimes you just want to know when "300 Construction-Drones" are available to be released.
This could be solved by ingame-mechanics. An Item working under the known rules of the circuit Network for generating a "Message with icon" (compare to Logistik-Network-Messages)
would be awesome (Maybe with options: "Hold" and "Pulse for X minutes"):
