[tor-bugs] #23113 [Core Tor/Tor]: Downgrade "All nameservers have faled" warning

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#23113: Downgrade "All nameservers have faled" warning
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     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.2.6.10
     Severity:  Normal        |   Keywords:  dns
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
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 We should downgrade this warning when it only happens for a short period
 of time (or a small number of requests), or when it happens in response to
 a malformed request.

 This warning is causing operators to make sub-optimal DNS server choices:
 for example, avoiding using a local cache in favour of remote resolvers.

 Sometimes changing the local resolver makes a difference:
 https://trac.torproject.org/projects/tor/ticket/1936#comment:12

 Sometimes it happens in response to malformed requests:
 https://trac.torproject.org/projects/tor/ticket/11600#comment:6

 Sometimes it's harmless:
 https://trac.torproject.org/projects/tor/ticket/11600#comment:7

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23113>
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