Signals and Telemetry for Multi-CDN
Synopsis This chapter explains how to collect, process, and apply telemetry for multi-CDN routing. It covers real user measurements, synthetic probes, provider health and routing data, logs from the service stack, and the aggregation and alerting that turn signals into safe decisions. The goal is to make routing reflect user experience and to change paths only when evidence supports a better outcome. Measurement goals All measurement should support a small set of goals. Confirm that users receive correct content with acceptable latency and reliability. Detect faults and degradations fast enough to protect users. Provide data that is stable enough for routing but sensitive enough to catch regressions. Keep the cost and complexity of the system proportional to its value. ...