Hi there,

I’ve been wondering recently if there’s been any thought around carrying out of 
band data through an Akka Stream in the spirit of network streams: 
https://en.m.wikipedia.org/wiki/Out-of-band_data 

One use case is for carrying Open Tracing Spans with elements without polluting 
stream stage operations. To illustrate: 
https://github.com/akka/alpakka/issues/463#issuecomment-365765409

By way of solution, perhaps this could be achieved similarly to the 
materialiser api calls eg viaMat/viaOob.

Thoughts?

Cheers 
C

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