[tor-bugs] #17366 [Tor]: Track consensus fetch times per country?

[Tor Bug Tracker & Wiki]

#17366: Track consensus fetch times per country?
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     Reporter:  arma     |      Owner:
         Type:           |     Status:  new
  enhancement            |  Milestone:  Tor: 0.2.???
     Priority:  Medium   |    Version:
    Component:  Tor      |   Keywords:  tor-relay
     Severity:  Normal   |  Parent ID:
Actual Points:           |    Sponsor:  SponsorM, SponsorQ, SponsorR,
       Points:           |  SponsorS, SponsorU, SponsorV
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 Right now Tor directories track consensus download times, and put that in
 their extrainfo descriptors.

 It would be useful to have this info broken down per country, so we can
 e.g. learn when vanilla Tor starts getting throttled in a particular
 country (like it did a few years ago). And hey, for obfs4 bridges, it
 would be neat to compare if they are able to deliver the consensus quickly
 when vanilla Tor isn't.

 I don't think we should put per-country performance stats into extra-info
 descs here, mostly since they'd get too big. I also briefly considered
 saying "well I only care about these two countries, so let's put only
 those in the extrainfo descs", but I think that's not a great strategy
 either.

 So I think the current goal for this ticket is to produce an easy patch
 for relay operators to use if they want to measure this data, and also to
 either make this patch sufficiently safe that we're ok if relay operators
 want to apply it -- or convince ourselves that it is too unsafe and it
 should not be used.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17366>
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