[metrics-bugs] #31755 [Metrics/Website]: Separate update pings and update requests graphs for Tor Browser alpha and release users

[Tor Bug Tracker & Wiki]

#31755: Separate update pings and update requests graphs for Tor Browser alpha and
release users
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     Reporter:  boklm            |      Owner:  metrics-team
         Type:  task             |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Website  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 On https://metrics.torproject.org/webstats-tb.html we have some graphs
 showing the number of Update pings and Update requests from Tor Browser
 users.

 Those numbers currently include both `alpha` and `release` users. However
 it would be nice to be able to know how many alpha users we have. For that
 we could have separate graphs for `alpha` and `release` users.

 According to https://metrics.torproject.org/stats.html#webstats-tb the
 `update_pings` and `update_requests` are counted with:
 * update_pings: GET requests to all sites with resource strings
 `'%/torbrowser/update\__/%'` and response code 200. To separate `alpha`
 and `release` users we could use the resource strings
 `'%/torbrowser/update\__/alpha/%'` and
 `'%/torbrowser/update\__/release/%'`.
 * update_requests: GET requests to all sites with resource strings
 `'%/torbrowser/%.mar'` and response code 302. Separating `update_requests`
 is more difficult as the URL does not include the word `alpha` or
 `release`. However it includes the version number (as the name of the
 directory under `/torbrowser/`), which includes an `a` in case of an alpha
 version, and no letter (only numbers and dots) in case of a stable
 release.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31755>
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