Is there any easy way to tell which layer did a gRPC call fail in? (gRPC 
server layer vs application code layer)

Is there any field in the header that I can look into to easily tell? Or 
what's the common practice for it?

I think it can be solved by implementing a server interceptor and flag a 
customized metadata before it goes into the application code. But I wonder 
if there's other neater way. Thanks!

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