Hey Akka Stream'ers,

I'm trying to monitor the current size of the buffer of a Akka Stream 
buffer() stage to something like Grafana.

Is there a way to hook a call to my metrics framework into the buffer? I 
was hoping for a second parameter to buffer, maybe

    flow.buffer(1000, size => Metrics.gauge("Buffer size", size))

(where Metrics.gauge() is just an example call to a metrics framework).

Any ideas?

Thanks,
Hbf

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