[tor-bugs] #30441 [Circumvention/BridgeDB]: Stop BridgeDB from handing out offline bridges

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#30441: Stop BridgeDB from handing out offline bridges
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 Reporter:  phw                                  |          Owner:  phw
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Very High                            |      Milestone:
Component:  Circumvention/BridgeDB               |        Version:
 Severity:  Major                                |     Resolution:
 Keywords:  user-feedback, blog, anti-           |  Actual Points:
  censorship-roadmap                             |
Parent ID:                                       |         Points:  2
 Reviewer:                                       |        Sponsor:
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Comment (by phw):

 Replying to [comment:13 teor]:
 > Replying to [comment:10 phw]:
 > > I believe one problem is that Serge's cached-extrainfo and cached-
 extrainfo.new do not contain ''all'' bridges that are in networkstatus-
 bridges, so the results only represent a lower bound of unreachable obfs4
 bridges.
 >
 > In tor, extrainfo descriptors are only created when statistics are on.
 > But we could change that so we create extrainfo descriptors that just
 contain the PT lines, even when statistics are off.
 [[br]]
 Does this mean that when a, say, obfs4 bridge turns off its statistics, we
 wouldn't know that it runs obfs4 because we never received the transport
 line in its extrainfo document? If so, this seems worth fixing.

 Also, what config option controls these statistics?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30441#comment:14>
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