[metrics-bugs] #22207 [Core Tor/Tor]: Add bridge authority fingerprint to sanitized bridge network statuses

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#22207: Add bridge authority fingerprint to sanitized bridge network statuses
-----------------------------+------------------------------------
 Reporter:  karsten          |          Owner:  metrics-team
     Type:  enhancement      |         Status:  merge_ready
 Priority:  Medium           |      Milestone:  Tor: 0.3.1.x-final
Component:  Core Tor/Tor     |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  intro, SponsorM  |  Actual Points:  .5
Parent ID:                   |         Points:  .5
 Reviewer:  isis             |        Sponsor:
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Comment (by isis):

 Replying to [comment:6 nickm]:
 > Since this only affects dump_bridge_status_to_file(), it can't do too
 much harm.  So I'd take it in 0.3.1 if need be.
 >
 > Is the data format specified here?  If so, we need a spec patch too.  If
 not, we should open a ticket about making sure we have a specified format.

 I think the only places this is documented is
 [https://pythonhosted.org/bridgedb/descriptors.html in BridgeDB's docs]
 and a bit
 [https://stem.torproject.org/api/descriptor/networkstatus.html#stem.descriptor.networkstatus.BridgeNetworkStatusDocument
 in Stem's docs], but BridgeDB skips everything in parsing the
 networkstatus until the first `r` line, so Stem has never really needed to
 learn to read the prelude stuff. (We can and maybe should open a ticket
 for getting some of that documentation into torspec and keeping it more
 up-to-date.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22207#comment:7>
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