Reproduction scenario:
Makerbot Replicator 2X
Octoprint at Raspberry Pi3B+ connected via USB cable from Printer to pi
OctoPrint 1.4.0 running on OctoPi 0.17.0
Heater Timeout 600s
Duriing a normal print on the Makerbot Replicator 2x, I Recieved notifications every 15 seconds after 10 minutes passed that the Heater Timeout heater idle timeout Triggered. see attached screen capture. The print continued, but the messages filled the screen. I notice you made a recent revision to hide notifications and I will give it a try.
Imported issue from the original repo
chemixt: