Instrumentação customizada em Go

import (
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/trace"
)

var tracer = otel.Tracer("my-tracer-name")

func httpHandler(w http.ResponseWriter, r *http.Request) {
	// Create a new span from the parent context
	ctx, span := tracer.Start(r.Context(), "hello-span")
	// Defer closing the span to the end of this function
	defer span.End()

	// Set attributes
}

func httpHandler(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
    span := trace.SpanFromContext(ctx)

	// Set attributes
}

span = // Create a new span or fetch the current span
span.SetAttributes(attribute.String("attribute_name", "attribute value"))