In https://opentelemetry.io/docs/specs/otel/protocol/exporter/#specify-protocol, The "Specify Protocol" section mentions that the default protocol may be set to gRPC for backwards-compatibility, but https://opentelemetry.io/docs/specs/otel/protocol/exporter/#configuration-options gives no warning of this. As a result, it can be confusing if an SDK's default for protocol is different than what is specified here.