[tor-bugs] #10218 [Tor]: Provide "users-per-transport-per-country" statistics for obfsbridges

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#10218: Provide "users-per-transport-per-country" statistics for obfsbridges
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 Reporter:  asn                    |          Owner:
     Type:  task                   |         Status:  new
 Priority:  normal                 |      Milestone:
Component:  Tor                    |        Version:
 Keywords:  `tor-bridge` `tor-pt`  |  Actual Points:
Parent ID:                         |         Points:
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 In our `bridge-stats` file we currently have `bridge-ips` which tracks the
 number of connections per-country, and `bridge-ip-transports` which counts
 the number of connections per-transport.

 Still, these two data points don't allow you to infer the users-per-
 transport-per-country; which would give us useful information in case of
 blocked transports in specific jurisdictions, etc.

 gamambel today suggested that we add such functionality, which seems like
 a marvelous idea.

 `wfn` and `grindhold` seem interested in coding this. As discussed in IRC,
 interesting functions here are:`geoip_get_transport_history()`
 `geoip_format_bridge_stats()` `validate_bridge_stats()`.

 We should also define a nice format for this new line in `bridge-stats`. A
 not nice format is:
 {{{bridge-ip-transports-per-country cn::obfs2:42,obfs3:46
 ir::obfs2:10,obfs3:666}}}
 we might be able to find a better one (or even one that is used currently
 somewhere else in tor).

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10218>
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