[tor-bugs] #28563 [Core Tor/sbws]: Work out how sbws can report excluded relays in the bandwidth file

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#28563: Work out how sbws can report excluded relays in the bandwidth file
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 Reporter:  teor                                 |          Owner:  juga
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  sbws:
                                                 |  1.1.0
Component:  Core Tor/sbws                        |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-bwauth, sbws-1.0-must-           |  Actual Points:
  moved-20181128, sbws-11x-final-                |
  removed-20190312, sbws-110-proposed, changes-  |
  version-minor                                  |
Parent ID:  #28547                               |         Points:
 Reviewer:  nickm                                |        Sponsor:
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Comment (by teor):

 Replying to [comment:28 nickm]:
 > Left a code review on github; I think this looks okay as a design,
 though we need to make sure we don't actually give this output to any tor
 authority versions that aren't running with #29806.

 We'd really like to deploy this change in sbws, even if the authorities
 haven't upgraded to a version of Tor with #29806. (Or even if we decide
 not to backport #29806.)

 I made some additions to the spec on the pull request, to explain why
 that's ok:
 {{{
 Because Tor versions 0.3.4.11, 0.3.5.8, 0.4.0.2-alpha, and earlier
 ignore this KeyValue, generator implementations MUST set "bw=1"
 for a relay when Tor directory authorities SHOULD ignore its relay
 line. Using the minimum bw value allows authorities that do not
 understand "vote=0" or "unmeasured=1" to produce sensible votes
 for unmeasured relays.
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28563#comment:30>
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