Configuring OTEL Trace Exporter for Arize in Golang

# Arize Cloud Configuration
ARIZE_ENDPOINT=https://otlp.arize.com/v1
ARIZE_SPACE_KEY=***
ARIZE_API_KEY=***

// createArizeTraceExporter creates an OTLP trace exporter configured for Arize
func createArizeTraceExporter(ctx context.Context, env environment.Env) (trace.SpanExporter, error) {
	headers := map[string]string{
		"x-api-key":   env.ArizeAPIKey,
		"x-space-key": env.ArizeSpaceKey,
	}

	endpoint := env.ArizeEndpoint
	if endpoint == "" {
		endpoint = "localhost:4317" // Default for development
	}

	opts := []otlptracegrpc.Option{
		otlptracegrpc.WithEndpoint(endpoint),
		otlptracegrpc.WithHeaders(headers),
		otlptracegrpc.WithTimeout(5 * time.Second),
	}

	if strings.Contains(endpoint, "localhost") {
		opts = append(opts, otlptracegrpc.WithInsecure())
	}

	// Create exporter with throttling - only 5% of traces
	exporter, err := otlptracegrpc.New(ctx, opts...)
	if err != nil {
		return nil, err
	}

	// Wrap with sampling exporter (5% sampling)
	return NewSamplingExporter(exporter, 1.0), nil
}