fix: add workaround for OTEL_TRACES_EXPORTER logging an error message (…

…#783)

* fix: add workaround for OTEL_TRACES_EXPORTER logging an error message

* fix: set OTEL_TRACES_EXPORTER to empty string

* fix: don't set the OTEL_TRACES_EXPORTER env var unless necessary

* doc: fix signalfx url

README.md

@@ -91,4 +91,4 @@ distribution of [OpenTelemetry JS](https://github.com/open-telemetry/opentelemet
 It is licensed under the terms of the Apache Software License version 2.0. See [the
 license file](./LICENSE) for more details.
 
->ℹ️  SignalFx was acquired by Splunk in October 2019. See [Splunk SignalFx](https://www.splunk.com/en_us/investor-relations/acquisitions/signalfx.html) for more information.
+>ℹ️  SignalFx was acquired by Splunk in October 2019. See [Splunk SignalFx](https://www.splunk.com/en_us/about-splunk/acquisitions/signalfx.html) for more information.

src/tracing/index.ts

@@ -87,8 +87,15 @@ export function startTracing(opts: StartTracingOptions = {}): boolean {
     tracingContextManagerEnabled = true;
   }
 
-  // tracer provider
+  // Workaround for https://github.com/open-telemetry/opentelemetry-js/issues/3422
+  const envTracesExporter = process.env.OTEL_TRACES_EXPORTER;
+  if (envTracesExporter !== undefined) {
+    process.env.OTEL_TRACES_EXPORTER = '';
+  }
   const provider = new NodeTracerProvider(options.tracerConfig);
+  if (envTracesExporter !== undefined) {
+    process.env.OTEL_TRACES_EXPORTER = envTracesExporter;
+  }
 
   configureInstrumentations(options);