OpenTelemetry and Jaeger: follow requests across services

OpenTelemetry (OTel) is a vendor-neutral API and SDK for traces, metrics, and logs. Apps emit spans with trace and span IDs; context propagates over HTTP/gRPC headers (W3C Trace Context). The Collector can receive OTLP, process, and export to Jaeger, Tempo, or vendors. Sampling keeps overhead sane—always-on tail sampling is advanced.

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