[feature request] Add maximum open file descriptors limit about process-exporter HOT 4 CLOSED

I've thought about adding this functionality before. The complication (as I expound on in #3) is that since we're tracking process groups, not individual processes, how do we usefully represent the limits as an aggregate? For open FDs, we can just sum, but if you sum all the FD limits that doesn't give you much sense as to how close any individual procs in the group are getting to their limit. I'll look into adding the worstFdRatio metric I discussed in that PR soon.

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I've pushed a lightly tested implementation of worstFdRatio. I don't have time to build a new release right now but I'll try to get one out soon.

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Thank you for the fast support! I build it locally and it seems to work! Though when tracking a single process or processes of the same exe/comm, it does makes sense to report maxFDs right (and the maxFDs will be the same as the first process of the group correct)? Thank you again!

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Sure, it would make sense if you knew that you'd never have more than a single process in a group. I don't understand the rest of your question, i.e. the "or process of the same exe/comm" anad the "maxFDs will be the same as the first process of the group". There's no well defined "first" process in a group in the context of process-exporter. Anyway I think it's moot since I don't plan to add a maxFD metric, I'd like all metrics to be applicable for any groups monitored.

I'll close this issue once I've updated the docs and created a release containing it.

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