[tor-bugs] #18167 [Metrics]: Don't trust "bridge-ips" blindly for user number estimates

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#18167: Don't trust "bridge-ips" blindly for user number estimates
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 Reporter:  karsten  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  Medium   |      Milestone:
Component:  Metrics  |        Version:
 Severity:  Major    |     Resolution:
 Keywords:           |  Actual Points:
Parent ID:           |         Points:
  Sponsor:           |
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Comment (by dcf):

 > I'm going to attach a scatter plot in a minute, `dirreq-resp-by-bridge-
 ips-2016-01-27.png`, that puts the numbers of `"dirreq-v3-resp ok=..."`
 and `"bridge-ips"` in relation for statistics reported between December 1,
 2015 and last week. The two meek bridges `88F7..` and `AA03..` stand out
 quite a bit there as clusters close to the y axis.
 [[Image(dirreq-resp-by-bridge-ips-2016-01-27.png​)]]

 > I'm attaching a second scatter plot, `dirreq-resp-by-dirreq-
 reqs-2016-01-27.png`, that compares the numbers of `"dirreq-v3-resp
 ok=..."` to `"dirreq-v3-reqs"`. The correlation is close to linear, which
 makes sense, because the number of directory requests should roughly match
 the number of directory responses.
 [[Image(dirreq-resp-by-dirreq-reqs-2016-01-27.png​)]]

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18167#comment:1>
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