Observability

Synopsis This chapter describes monitoring and service level objectives for multi-CDN operation. It defines user facing indicators, explains stable aggregation and alerting, and outlines dashboards that connect routing decisions to outcomes. The aim is to detect harm early, confirm improvements with evidence, and support clear decisions during change and incident response. Objectives and scope Monitoring must show whether content is correct, whether latency and reliability meet commitments, and whether routing decisions help users. It must separate symptoms from causes, include regional and network context, and expose differences between providers. It should remain simple enough that on-call engineers can act without guesswork and detailed enough to support post-incident analysis. ...

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. ...