[tor-bugs] #29589 [Core Tor/sbws]: Recover a destination when it stops failing

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#29589: Recover a destination when it stops failing
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     Reporter:  juga           |      Owner:  (none)
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  sbws: 1.1.x-final
    Component:  Core Tor/sbws  |    Version:  sbws: 1.0.2
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:  1              |   Reviewer:
      Sponsor:                 |
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 In #28897 we count consecutive destination failures and stop the scanners
 if there are not destinations that did not fail x consecutive times.

 As teor commented, this can be improved to:
 - recover a destination if it starts working again after short time
 - error when all destinations fail for long time
 - let the operator configure the time or number of failures to consider a
 destination is failing.

 Implementation possibilities:
 - A destination failing can be tried again with a low probability
 - Wait for some minutes before considering a destination fails (after if
 has failed)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29589>
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