Definition:
Telemetry is the automated communications process by which measurements are made and data collected at remote points. Telemetry data may be relayed using radio, infrared, ultrasonic, GSM, satellite or cable, depending on the application.When properly instrumented, telemetry can also be used to see and understand in real time how customers are engaging with the application. This could be critical information for product managers, marketing teams, and customer support. Thus it’s important that feedback mechanisms share continuous intelligence with all stakeholders.
Further Reading:
Book: The DevOps Handbook by Gene Kim, Jez Humble,Patrick Debois.