[feature request] Support for more process and thread metrics about process-exporter HOT 3 CLOSED

These are good suggestions; the only one I think doesn't make sense is peak resident size, since you can get that by querying the history stored in prometheus (and over whatever interval you're interested in.)

CPU user/system and major/minor page faults are easy.

As to context switches and per-thread metrics, they're not currently supported by prometheus/procfs, which is the library I'm using right now to fetch the stats. Not necessarily a dealbreaker, but let's make that a different issue (#17) since it'll be more involved and I'd rather knock off the easy ones first.

Finally, wchan: what did you have in mind here? A metric namegroup_num_threads_waiting{groupname, wchan}? That makes me a little nervous in terms of how many different wchan values there might be, this could be a very big metric cardinality-wise.

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Hi,

Thanks for the answer!

Ok I see the procfs issue, make sense to start on the process metrics first.

On the wchan: Yes I would like to have the count of waiting threads for a specific process by waiting channel. In my experience, wchans are not so huge in number and are very useful in tracking down certain bottlenecks.

If you think the cardinality may be too high, this could perhaps be an option that is off by default.

Do you plan to support the CPU and faults metrics anytime soon?

Thanks!

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CPU and faults metrics are added. I've created #18 for your wchan feature request.

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