Inconsistent Handling of the Process Threads about process-exporter HOT 2 CLOSED

Thanks for the bug report, sadly you appear to be correct. The documentation for all this isn't wonderful, but I guess for anything that can be different from one thread to another (like context switches) there's no way to obtain the aggregate value without visiting every thread's proc files.

Unfortunately this means I'm going to have to either eliminate the -threads option and make it mandatory, or make the context switch metrics contingent on providing that option. I'll have to think about that, but for now I'll start by getting something working.

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I fixed this in the pre-release v0.3.11, by reading the thread data whether or not -threads is given. The thread-based metrics are only emitted when -threads is given, as before. I haven't yet decided whether to eliminate the option altogether and always emit them.

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