[tor-bugs] #22759 [Core Tor/Fallback Scripts]: Mark the fallbacks that have extra-info descriptors, so stem can use them

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#22759: Mark the fallbacks that have extra-info descriptors, so stem can use them
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  enhancement                          |         Status:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.3.x-final
Component:  Core Tor/Fallback Scripts            |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-dirauth, fallback-directory,     |  Actual Points:
  dos-resistance, review-group-28                |
Parent ID:  #22271                               |         Points:  0.5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 Replying to [comment:12 pastly]:
 > Not many of the fallbacks in the `fallback-format-2-v4` branch have
 extra info. Does this seem right?
 >
 > {{{
 > $ grep extrainfo fallback.stdout2 | sort | uniq -c
 >   63 /* extrainfo=0 */
 >    6 /* extrainfo=1 */
 >
 > }}}

 Yes, this is fine, it's a custom option that only a few relay operators
 set.

 atagar says that 6 is ok, because stem will use them along with the
 authorities:
 https://lists.torproject.org/pipermail/tor-dev/2017-December/012741.html

 (If the authority operators decide that extrainfo load is significant, we
 can always ask a few more fallback operators to enable extrainfo.)

 > Of course, the list this branch produces is too small still, but I think
 that's unrelated.
 >
 > {{{
 > Final Count: 69 (Eligible 82, Target 265 (1325 * 0.20), Max 200)
 > Excluded: 13 (Same Operator 8, Failed/Skipped Download 4, Excess 1)
 > Bandwidth Range: 1.7 - 39.1 MByte/s
 > }}}

 That will be fixed in #24785, I think it's happening because our stability
 settings assume a network without an ongoing denial of service.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22759#comment:13>
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