I'm doing a flatMapMerge something like this:
val stream = Source(channelMonths)
.flatMapMerge(10, channelMonth => {
.. Sources.intervalsForChannelMonth(channelMonth, ...)
})
I'm implementing some monitoring using alsoTo to send stream elements to a
monitoring actor which can keep counts and so forth.
How could I detect that the intervals source is sometimes empty? eg. record
the channels for which there are 0 intervals?
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