How to manage Distributed Tracing using OpenTelemetry in Go.

OpenTelemetry provides standard instrumentation to generate traces, metrics, and logs across microservices.

You initialize an OTel tracer provider. In Go, the context.Context is heavily utilized to carry the SpanContext (TraceID). When Service A calls Service B via HTTP/gRPC, the OTel middleware injects the TraceID into the HTTP headers (W3C Trace Context). Service B extracts it, linking their spans.