[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:  new
 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                                 |
Parent ID:  #22271                               |         Points:  0.5
 Reviewer:                                       |        Sponsor:
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Comment (by teor):

 Please see my branch ticket22759_tree, which is based on ticket24679 and
 ticket24600_tree.
 (Otherwise, there would be a lot of merge conflicts.)

 I'd like to get feedback from atagar and irl on the new fallback format
 before we merge this.

 Also, atagar may want to ask a few more operators to cache extra info
 documents:
 {{{
 WARNING::4/67 = 6% of fallbacks cache extra-info documents
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22759#comment:5>
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