[tor-bugs] #23367 [Metrics/Metrics website]: Onion address counts ignore descriptor upload overlap

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#23367: Onion address counts ignore descriptor upload overlap
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 Reporter:  teor                     |          Owner:  metrics-team
     Type:  defect                   |         Status:  new
 Priority:  Medium                   |      Milestone:
Component:  Metrics/Metrics website  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:
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Comment (by karsten):

 I'll have to dive deeper into this topic, but here are some quick
 thoughts:

  - I don't think we're including anything from v3 in these statistics, but
 we'd have to ask asn and dgoulet to be certain.
  - I believe we're taking descriptor overlap periods into account for v2.
 See Section 5, "Extrapolating network totals" of the linked report: "As an
 approximation, we assume that a hidden service publishes its descriptor to
 ''twelve'' directories over a 24-hour period: the service stores ''two''
 replicas per descriptor using different descriptor identifiers,  both
 descriptor replicas get stored to ''three'' different hidden-service
 directories each, and the service changes descriptor identifiers once
 every 24 hours which leads to ''two'' different descriptor identifiers per
 replica." And later in that section we say how this is just an
 approximation.

 Do you think there's a defect in the v2 code?

 And, independent of that question, is there anything in particular that
 should we keep in mind when extending this code to v3?

 Thanks!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23367#comment:1>
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