[tor-bugs] #30733 [Core Tor/sbws]: SBWS does not detect changes in max advertised bandwidth

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#30733: SBWS does not detect changes in max advertised bandwidth
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 Reporter:  starlight              |          Owner:  (none)
     Type:  defect                 |         Status:  new
 Priority:  Very High              |      Milestone:  sbws: 1.1.x-final
Component:  Core Tor/sbws          |        Version:  sbws: 1.1.0
 Severity:  Critical               |     Resolution:
 Keywords:  sbws-majority-blocker  |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
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Comment (by teor):

 Our acceptance criteria for sbws is a 50% variance from the consensus,
 because that's what torflow's variance was before we started deploying
 sbws. See #27339.

 Replying to [comment:9 starlight]:
 > Defect is extremely severe.  SBWS should be removed from production
 until this is fixed.

 This defect has a limited impact. So we won't remove sbws from production.

 > Longclaw has thirteen percent of listed relays with incorrect descriptor
 information more than 7% away from the published consensus.

 Why pick 7%?

 The total consensus weight of the bandwidth authorities now varies by up
 to +43%, -14% from the consensus.
 https://metrics.torproject.org/totalcw.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30733#comment:12>
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