No longer disable OpenTelemetry exporters in default agent config

Author: adinauer

sentry-opentelemetry/sentry-opentelemetry-agent/README.md

@@ -44,3 +44,17 @@ To enable debug logging for Sentry, please provide `SENTRY_DEBUG=true` as enviro
 add `debug=true` to your `sentry.properties`.
 
 To also show debug output for OpenTelemetry please add `-Dotel.javaagent.debug=true` to the command.
+
+## Getting rid of exporter error messages
+
+In case you are using this agent without needing to use any OpenTelemetry exporters you can add
+the following environment variables to turn off exporters and stop seeing error messages about 
+servers not being reachable in the logs.
+
+Example log message:
+```
+ERROR io.opentelemetry.exporter.internal.grpc.OkHttpGrpcExporter - Failed to export metrics. The request could not be executed. Full error message: Failed to connect to localhost/[0:0:0:0:0:0:0:1]:4317
+```
+
+To turn off exporting of traces you can set `OTEL_TRACES_EXPORTER=none`
+see [OpenTelemetry GitHub](https://github.com/open-telemetry/opentelemetry-java/tree/main/sdk-extensions/autoconfigure#otlp-exporter-span-metric-and-log-exporters)

sentry-opentelemetry/sentry-opentelemetry-agentcustomization/src/main/java/io/sentry/opentelemetry/SentryAutoConfigurationCustomizerProvider.java

@@ -92,8 +92,6 @@ private SdkTracerProviderBuilder configureSdkTracerProvider(
 
   private Map<String, String> getDefaultProperties() {
     Map<String, String> properties = new HashMap<>();
-    properties.put("otel.traces.exporter", "none");
-    properties.put("otel.metrics.exporter", "none");
     properties.put("otel.propagators", "sentry");
     return properties;
   }