In the three-minute long video, you can see Mr. Williams using Canonical’s Orange Match Box Raspberry Pi 2 PiGlow, with Juju installed on it, to controll a realtime syslog analytics big data bundle as an example environment deployed in Amazon Elastic Compute Cloud (EC2). He uses the flashing leds on the Raspberry Pi 2 single-board computer (SBC) to receive notifications of the status of his cloud services. In the video posted at the end of the article you can see how the leds start flashing when there are problems.