How do I create an alert for a specific device?

You have two options here.

1. You can go to the Device Management Service via the device itself and create an alert in the Alert tab of the device. Here you just need to select the Chanel and set the trigger criteria for the alert.
2. You can click on “Add rule” in the alerting area of the Device Management Service and create an alert here. Here you must also select the device that is to be monitored.