[tor-bugs] #5055 [Tor Bridge]: Extend bridge statistics to learn about IPv4 vs. IPv6 usage

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#5055: Extend bridge statistics to learn about IPv4 vs. IPv6 usage
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 Reporter:  karsten      |          Owner:                    
     Type:  enhancement  |         Status:  new               
 Priority:  normal       |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor Bridge   |        Version:                    
 Keywords:               |         Parent:                    
   Points:               |   Actualpoints:                    
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 One of the main purposes for making bridges accept IPv6 connections was to
 circumvent some firewalls.  But we don't have any statistics to see how
 well that works.  IPv6 bridges always support IPv4, too, so we can't say
 from the current bridge statistics if connections came from one or the
 other address version.

 In #5053 I briefly wondered if we should add a new country code `"?6"` to
 count unresolved IPv6 addresses.  But that doesn't make sense, because as
 soon as we have an IPv6 GeoIP database, we wouldn't know if users coming
 from `"de"` actually connected to the bridge via IPv4 or IPv6.

 How about we add a new line `"bridge-ip-versions v4=NN,v6=NN"` to count
 unique IP addresses for the two IP address versions?

 In theory, we could add similar lines to the other statistics, but it
 mostly matters for bridge usage.  I would want to do this for bridge
 statistics only, at least for the moment.  And by "for the moment" I mean
 for 0.2.4.x.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5055>
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