OTLP HTTP Exporter Should Not Use the GRPC Port

[NathanielRN]

Please answer these questions before submitting a bug report.

What version of OpenTelemetry are you using?

0.23.0

What version of Node are you using?

14

Please provide the code you used to setup the OpenTelemetry SDK

const tracerProvider = new NodeTracerProvider(config);
tracerProvider.addSpanProcessor(
  new BatchSpanProcessor(new CollectorTraceExporter())
);

What did you do?

The opentelemetry-collector has default OTLP receivers for gRPC run on port 4317 and HTTP run on 55681

https://github.com/open-telemetry/opentelemetry-collector/blob/f3784a92def81ae9b5c770c97ac2d5bed4f9b804/receiver/otlpreceiver/factory.go#L33-L34

The port for gRPC is outlined in the specs:

https://github.com/open-telemetry/opentelemetry-specification/blob/2a712f7626cb62b21ae210ef3175612e7744f285/specification/protocol/otlp.md#otlpgrpc-default-port

The JavaScript opentelemetry-exporter-collector-grpc package correctly exports gRPC to 4317:

opentelemetry-js/packages/opentelemetry-exporter-collector-grpc/src/CollectorTraceExporter.ts

Line 28 in 3a327dd

const DEFAULT_COLLECTOR_URL = 'localhost:4317';

However, the JavaScript opentelemetry-exporter-collector-proto clashes because it tries to export HTTP to the 4317 port reserved for gRPC:

opentelemetry-js/packages/opentelemetry-exporter-collector-proto/src/CollectorMetricExporter.ts

Line 27 in 3a327dd

const DEFAULT_COLLECTOR_URL = 'http://localhost:4317/v1/metrics';

What did you expect to see?

opentelemetry-exporter-collector-proto should probably use port 55681 to match opentelemetry-collector.

What did you see instead?

I observed that the SDK will error out if opentelemetry-exporter-collector-proto is configured to send HTTP to the gRPC port running 4317 because they are not compatible.

Additional context

Add any other context about the problem here.