[tor-bugs] #8786 [Tor]: Add extra-info line that tracks the number of consensus downloads of each pluggable transports

[Tor Bug Tracker & Wiki]

#8786: Add extra-info line that tracks the number of consensus downloads of each
pluggable transports
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 Reporter:  asn                       |          Owner:                    
     Type:  defect                    |         Status:  new               
 Priority:  normal                    |      Milestone:  Tor: 0.2.5.x-final
Component:  Tor                       |        Version:                    
 Keywords:  pt tor-bridge flashproxy  |         Parent:                    
   Points:                            |   Actualpoints:                    
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 In #5040, Karsten suggested to add yet another line for measuring
 obfsbridge stats.

 He wants a `dirreq-v3-transport` line with the exact same format as
 `bridge-ip-transports`, that counts consensus fetches instead of direct
 connections. This will improve the granularity of bridge statistics, and
 it will help us count users accurately in scenarios like flashproxy (where
 each client is actually a flashproxy bridge).

 This means that we should be considering the
 `GEOIP_CLIENT_NETWORKSTATUS_V2` and `GEOIP_CLIENT_NETWORKSTATUS` events in
 this case, instead of `GEOIP_CLIENT_CONNECT`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8786>
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