[tor-bugs] #31422 [Circumvention/BridgeDB]: Make BridgeDB report internal metrics

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#31422: Make BridgeDB report internal metrics
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     Reporter:  phw                     |      Owner:  (none)
         Type:  enhancement             |     Status:  new
     Priority:  Medium                  |  Milestone:
    Component:  Circumvention/BridgeDB  |    Version:
     Severity:  Normal                  |   Keywords:  metrics
Actual Points:                          |  Parent ID:
       Points:  2                       |   Reviewer:
      Sponsor:  Sponsor30-can           |
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 We're done with #9316, which means that we have code in place that allows
 BridgeDB to export metrics. So far, all metrics are user-centric, meaning
 that they focus on how BridgeDB users interact with the system. BridgeDB-
 centric metrics would help us debug and understand BridgeDB. The following
 come to mind:

 * Number of bridges per distribution ring.
 * Number of requests for which we had no bridges.

 We could also incorporate bridge assignments in our metrics, so we don't
 have to report them separately in the assignments.log file (see #29480).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31422>
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