example/dice: Do not use semconv (#4849)

* example/dice: Do not use semconv

* Update docs

* Remove resource code and use defaults

example/dice/doc.go

@@ -12,5 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Dice is the "Roll the dice" getting started example application.
+// Dice is the "Roll the dice" application.
+//
+// [Getting Started] uses this example to demonstrate OpenTelemetry Go.
+//
+// [Getting Started]: https://opentelemetry.io/docs/languages/net/automatic/getting-started/
 package main

example/dice/main.go

@@ -39,9 +39,7 @@ func run() (err error) {
 	defer stop()
 
 	// Set up OpenTelemetry.
-	serviceName := "dice"
-	serviceVersion := "0.1.0"
-	otelShutdown, err := setupOTelSDK(ctx, serviceName, serviceVersion)
+	otelShutdown, err := setupOTelSDK(ctx)
 	if err != nil {
 		return
 	}

example/dice/otel.go

@@ -24,14 +24,12 @@ import (
 	"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/sdk/metric"
-	"go.opentelemetry.io/otel/sdk/resource"
 	"go.opentelemetry.io/otel/sdk/trace"
-	semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
 )
 
 // setupOTelSDK bootstraps the OpenTelemetry pipeline.
 // If it does not return an error, make sure to call shutdown for proper cleanup.
-func setupOTelSDK(ctx context.Context, serviceName, serviceVersion string) (shutdown func(context.Context) error, err error) {
+func setupOTelSDK(ctx context.Context) (shutdown func(context.Context) error, err error) {
 	var shutdownFuncs []func(context.Context) error
 
 	// shutdown calls cleanup functions registered via shutdownFuncs.
@@ -51,19 +49,12 @@ func setupOTelSDK(ctx context.Context, serviceName, serviceVersion string) (shut
 		err = errors.Join(inErr, shutdown(ctx))
 	}
 
-	// Set up resource.
-	res, err := newResource(serviceName, serviceVersion)
-	if err != nil {
-		handleErr(err)
-		return
-	}
-
 	// Set up propagator.
 	prop := newPropagator()
 	otel.SetTextMapPropagator(prop)
 
 	// Set up trace provider.
-	tracerProvider, err := newTraceProvider(res)
+	tracerProvider, err := newTraceProvider()
 	if err != nil {
 		handleErr(err)
 		return
@@ -72,7 +63,7 @@ func setupOTelSDK(ctx context.Context, serviceName, serviceVersion string) (shut
 	otel.SetTracerProvider(tracerProvider)
 
 	// Set up meter provider.
-	meterProvider, err := newMeterProvider(res)
+	meterProvider, err := newMeterProvider()
 	if err != nil {
 		handleErr(err)
 		return
@@ -83,22 +74,14 @@ func setupOTelSDK(ctx context.Context, serviceName, serviceVersion string) (shut
 	return
 }
 
-func newResource(serviceName, serviceVersion string) (*resource.Resource, error) {
-	return resource.Merge(resource.Default(),
-		resource.NewWithAttributes(semconv.SchemaURL,
-			semconv.ServiceName(serviceName),
-			semconv.ServiceVersion(serviceVersion),
-		))
-}
-
 func newPropagator() propagation.TextMapPropagator {
 	return propagation.NewCompositeTextMapPropagator(
 		propagation.TraceContext{},
 		propagation.Baggage{},
 	)
 }
 
-func newTraceProvider(res *resource.Resource) (*trace.TracerProvider, error) {
+func newTraceProvider() (*trace.TracerProvider, error) {
 	traceExporter, err := stdouttrace.New(
 		stdouttrace.WithPrettyPrint())
 	if err != nil {
@@ -109,19 +92,17 @@ func newTraceProvider(res *resource.Resource) (*trace.TracerProvider, error) {
 		trace.WithBatcher(traceExporter,
 			// Default is 5s. Set to 1s for demonstrative purposes.
 			trace.WithBatchTimeout(time.Second)),
-		trace.WithResource(res),
 	)
 	return traceProvider, nil
 }
 
-func newMeterProvider(res *resource.Resource) (*metric.MeterProvider, error) {
+func newMeterProvider() (*metric.MeterProvider, error) {
 	metricExporter, err := stdoutmetric.New()
 	if err != nil {
 		return nil, err
 	}
 
 	meterProvider := metric.NewMeterProvider(
-		metric.WithResource(res),
 		metric.WithReader(metric.NewPeriodicReader(metricExporter,
 			// Default is 1m. Set to 3s for demonstrative purposes.
 			metric.WithInterval(3*time.Second))),