[tor-bugs] #18203 [Metrics]: Base direct user estimates on responses to directory requests

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#18203: Base direct user estimates on responses to directory requests
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     Reporter:  karsten      |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Metrics      |    Version:
     Severity:  Minor        |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
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 Relays report two different statistics related to directory requests:
  - `"dirreq-v3-reqs"` contain the number of ''requests'' broken down by
 country and
  - `"dirreq-v3-resp"` contain the number of ''responses'' broken down by
 status code.

 We're using the number of responses to estimate bridge users but the
 number of requests to estimate direct users.  We should use the same input
 for both estimates.  Using the number of responses (successful requests)
 seems more intuitive, because we're assuming that each client needs to
 fetch 10 fresh consensuses every day, and they might have to make more
 than 10 requests if one or more of them is not successful.

 I'll attach an analysis shortly.

 This minor enhancement came up when working on #18167.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18203>
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