You know that sinking feeling when your production line suddenly stops? Or when critical sensor data just... disappears? If you're running IoT edge devices, you've probably experienced this at least once. Maybe a gateway that silently failed at 3 AM. Or an edge module that consumed all available memory without warning.

Let's say you have several hundred IoT devices publishing telemetry data to your MQTT broker and things have been working smoothly for months. One morning you notice half of the sensor readings have stopped arriving. Your monitoring dashboard becomes a black hole, your automation stops working, and you can't determine whether the problem is with the devices, the network, or the MQTT broker.