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Distributed Tracing with OpenTelemetry
5.1Why Distributed Tracing?In a microservices architecture, a single user request may traverse 5, 10, or 20 services. When that request is slow or fails, you need to…5.2OpenTelemetry ArchitectureOpenTelemetry (OTel) is the CNCF standard for collecting telemetry data. It provides vendor-neutral APIs, SDKs, and a collector for traces…5.3How Traces, Spans, and Context Work TogetherThe trace reveals the payment service is the bottleneck (1200ms out of ~1300ms total). The metric confirms this is a trend. The log…5.4Instrumenting a Python Service5.5Trace-Based TestingA powerful pattern is writing assertions against traces -- verifying not just that a request succeeded, but that it followed the expected…5.6OpenTelemetry Collector Configuration5.7Sampling StrategiesIn high-traffic systems, collecting every trace is expensive. Choose a sampling strategy: