http-trace-span-propagation

Overview ¶

Package http-trace-span-propagation demonstrates trace span propagation across HTTP, forge, and file I/O layers using the observer pattern.

Scenario:

1. HTTP POST with JSON body {"name":"Alice"} to a greeting service.
2. Server decodes JSON, calls a forge computation function.
3. Forge writes the result to a temp file for persistence.
4. Server returns the JSON greeting.

A single stats.NewFanout value wires a demo tracer, metrics, and structured logging. The tracer records parent→child span names to prove context propagation works through every layer.

Run with: go run ./examples/http-trace-span-propagation