docs(exporters/autoexport): add example file

Signed-off-by: thomasgouveia <[email protected]>

exporters/autoexport/example_test.go

@@ -0,0 +1,56 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package autoexport_test
+
+import (
+	"context"
+	"os"
+
+	"go.opentelemetry.io/contrib/exporters/autoexport"
+	"go.opentelemetry.io/otel/sdk/log"
+	"go.opentelemetry.io/otel/sdk/metric"
+	"go.opentelemetry.io/otel/sdk/trace"
+)
+
+func Example_complete() {
+	ctx := context.Background()
+
+	// Only for demonstration purposes.
+	_ = os.Setenv("OTEL_LOGS_EXPORTER", "otlp,console")
+	_ = os.Setenv("OTEL_TRACES_EXPORTER", "otlp")
+	_ = os.Setenv("OTEL_METRICS_EXPORTER", "otlp")
+
+	// Consider checking errors in your production code.
+	logExporters, _ := autoexport.NewLogExporters(ctx)
+	metricReaders, _ := autoexport.NewMetricReaders(ctx)
+	traceExporters, _ := autoexport.NewSpanExporters(ctx)
+
+	// Now that your exporters and readers are initialized,
+	// you can simply initialize the different TracerProvider,
+	// LoggerProvider and MeterProvider.
+	// https://opentelemetry.io/docs/languages/go/getting-started/#initialize-the-opentelemetry-sdk
+
+	// Traces
+	var tracerProviderOpts []trace.TracerProviderOption
+	for _, traceExporter := range traceExporters {
+		tracerProviderOpts = append(tracerProviderOpts, trace.WithBatcher(traceExporter))
+	}
+	_ = trace.NewTracerProvider(tracerProviderOpts...)
+
+	// Metrics
+	var meterProviderOpts []metric.Option
+	for _, metricReader := range metricReaders {
+		meterProviderOpts = append(meterProviderOpts, metric.WithReader(metricReader))
+	}
+	_ = metric.NewMeterProvider(meterProviderOpts...)
+
+	// Logs
+	var loggerProviderOpts []log.LoggerProviderOption
+	for _, logExporter := range logExporters {
+		loggerProviderOpts = append(loggerProviderOpts, log.WithProcessor(
+			log.NewBatchProcessor(logExporter),
+		))
+	}
+	_ = log.NewLoggerProvider(loggerProviderOpts...)
+}