Go SDK

package main

import (
    "context"
    "go.opentelemetry.io/otel"
    "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
    "go.opentelemetry.io/otel/sdk/trace"
)

func main() {
    ctx := context.Background()

    exporter, _ := otlptracehttp.New(ctx,
        otlptracehttp.WithEndpoint("localhost:9411"),
        otlptracehttp.WithInsecure(),
    )

    tp := trace.NewTracerProvider(
        trace.WithBatcher(exporter),
    )
    otel.SetTracerProvider(tp)

    tracer := otel.Tracer("my-service")
    
    _, span := tracer.Start(ctx, "llm_call")
    defer span.End()
    
    span.SetAttributes(
        attribute.String("model", "gpt-4"),
        attribute.Float64("cost_usd", 0.003),
    )
}