Jaeger

Jaeger reads and continues Jaeger’s Uber-Trace-Id header and reports a span for each request to a function you provide. It has no dependencies. For new systems, prefer OpenTelemetry.

app.Use(middleware.Jaeger(func(c *zinc.Context, span middleware.JaegerSpan) error {
  log.Printf("%s %s %s", span.TraceID, span.Operation, span.Duration)
  return nil
}))

If a request already has an Uber-Trace-Id, Zinc keeps the trace ID and uses the incoming span ID as the parent span. Otherwise Zinc generates a new trace ID and span ID.

Inside handlers, read the current span with:

span, ok := middleware.JaegerCurrent(c)

Use JaegerWithConfig to customize operation names or timing.