Hello all,

I was not able to find any good practices around modifying metadata in 
interceptors. We have the following interceptor and it fails when the same 
ctx is used to invoke multiple calls concurrently due to metadata 
race: 
https://github.com/GoogleCloudPlatform/google-cloud-go/blob/master/trace/grpc.go#L40

What's the suggested method here? Should we always copy the invoker ctx's 
metadata in interceptors?

Thanks,
jbd

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