Are rpc.request.metadata and rpc.response.metadata gRPC specific?

[trask]

What are you trying to achieve?

Clarity on whether rpc.request.metadata. and rpc.response.metadata. are generic RPC attributes, or specific to gRPC.

What did you expect to see?

If they are generic RPC attributes, I would not expect them to be under the gRPC section of the RPC semantic attributes.

If they are gRPC specific attributes, I would expect them to be prefixed with rpc.grpc., similar to rpc.grpc.status_code.

[reyang]

I think these should be gRPC metadata instead of generic metadata.