[feature request] add number of threads about process-exporter HOT 6 CLOSED

Sorry @flixr, I let this one slip by me. I'll try to get to it next week.

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The simple numThreads (without status as per #17) is already available in prometheus/procfs

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Thanks for the PR. I'm going to hold off on merging it until we decide what to do about #19 and #17, since it may make this redundant.

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I first thought so as well, but I now think this would make sense in any case as it doesn't cost more and #19 would probably be configurable for only some processes. (And #17 is basically a subset of #19)

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#17 need not be a subset of #19, as described it was going to give a count of how many threads are in which state. I agree that given #19 it may make more sense to report these counts on the more granular per-threadname basis it will introduce, but I haven't fully made up my mind. I think I might want the #17 metrics for my primary use case, where I may not be able to tolerate the huge increase in metric count that the #19 threaded-mode will bring in. Then again, with the huge resource savings Prometheus 2 will bring, maybe I shouldn't be worrying so much about the number of metrics.

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I thought about it some more and I decided that as you say it's a useful metric and adding this doesn't require any extra files so it's cheap. And some people who don't want the extra overhead of parsing the per-thread files may want this metric.

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