[metrics-bugs] #26868 [Metrics/Statistics]: How does metrics get bridge statistics at a granularity of 1 user?

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#26868: How does metrics get bridge statistics at a granularity of 1 user?
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 Reporter:  teor                |          Owner:  metrics-team
     Type:  defect              |         Status:  new
 Priority:  Medium              |      Milestone:
Component:  Metrics/Statistics  |        Version:
 Severity:  Normal              |     Resolution:
 Keywords:                      |  Actual Points:
Parent ID:                      |         Points:
 Reviewer:                      |        Sponsor:
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Comment (by teor):

 So, I believe he answer to my question is:

 "We approximate directory request numbers by multiplying the fraction of
 unique IP addresses from a given country, transport, or IP version with
 the total number of successful requests."

 But I think there are two missing steps:
 * Metrics appears to round/truncate/ceiling client numbers to the nearest
 integer
 * You say that you "Skip dates where frac is smaller than 10% and hence
 too low for a robust estimate"
   * are the snowflake bridges less than 10% of total bridge usage? That
 could be why their numbers vary so much.
   * how do you calculate 10% of bridge usage? (Bridges don't have
 bandwidth, so do you use unique IP addresses?)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26868#comment:7>
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