Measure element latency

[clubberlang]

>  So best is if we get these tracer output hooks upstream, and then you can
implement something on top, rather then inside of it. 

Is this what Michael suggested to hook a log handler? The reason I would
like to emit those latency measurements is because I think writing to disks
increases the CPU usage drastically. We want these measurements to be
emitted as application metrics and in a cost-effective way -- not eat up too
much CPU cycles for writing to file.



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