Hi Guys,

I am writing a grpc based library with built in support for metrics 
capturing among other things.
The idea is that an interceptor on the server will capture metrics before 
and after the call it delegated the the intended service.

That's working fine but how do I find the timestamp when the client 
initiated the call to calculate the end to end latency.
Is this something that needs to be added as another interceptor on the 
client side?
If so, what's the best place to put the timestamp, in the header I suppose?

Or is there an easier way (in built by grpc) to access the timestamp from 
the client?

Cheers

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