OTEL_EXPORTER_JAEGER_ENDPOINT sdk env option has wrong default value

[blumamir]

According to the spec, the default value for OTEL_EXPORTER_JAEGER_ENDPOINT should be http://localhost:14250.

According to Jaeger website, port 14250 is used to send spans in model.proto format, where port 14268 "accept jaeger.thrift directly from clients".

In GO sdk, the default value is different from the specification: "http://localhost:14268/api/traces".

This PR changed it and explains why the value in the spec is not correct.

JS sdk is also mentioning the 14268 endpoint here instead of the default 14250.

I suspect that the value should change in spec from http://localhost:14250 to http://localhost:14268/api/traces

[carlosalberto]

cc @yurishkuro

[srikanthccv]

I believe it is 14268 for thrift over http and 14250 for proto over grpc. See the related exporter selection where known value jaeger for OTEL_TRACES_EXPORTER recommends using Jaeger gRPC.

[blumamir]

exporter selection

Thanks for the reference. Wonder why GO and JS choose to export via thrift and not gRPC.
Anyhow it's not related to this issue I suppose.