ooni / probe-cli / 7292022356

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feat(oohelperd): protect against overload and add metrics (#1442)

## Checklist

- [x] I have read the [contribution
guidelines](https://github.com/ooni/probe-cli/blob/master/CONTRIBUTING.md)
- [x] reference issue for this pull request:
https://github.com/ooni/probe/issues/2649
- [x] if you changed anything related to how experiments work and you
need to reflect these changes in the ooni/spec repository, please link
to the related ooni/spec pull request: N/A
- [x] if you changed code inside an experiment, make sure you bump its
version number: N/A

## Description

This diff makes oohelperd more robust against overload and introduces
additional prometheus metrics.

75 of 92 new or added lines in 5 files covered. (81.52%)

24883 of 31328 relevant lines covered (79.43%)

39.11 hits per line