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ConnDirectionStatistics is off by default, but most relays report it

Karsten noticed that most relays report ConnDirectionStatistics, but it's off by default in tor: https://lists.torproject.org/pipermail/tor-dev/2020-February/014159.html https://2019.www.torproject.org/docs/tor-manual.html.en

That's a bit of a mystery, here are some possible causes:

  • most large distributions set it on by default
    • Debian + Ubuntu + ... ?
    • sample torrcs?
  • there is a bug in most tor relays, that sets it on by default
    • since at least 0.2.9?

We don't have to fix this bug in Sponsor 55, but we need to be aware of it, because we're going to modify the ConnDirectionStatistics code.

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