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

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#23113: Downgrade "All nameservers have faled" warning
--------------------------+------------------------------------
 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        |     Resolution:
 Keywords:  dns           |  Actual Points:
Parent ID:                |         Points:  1
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------
Description changed by teor:

Old description:

> 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

New description:

 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
 Because it's followed by:
 {{{
 [notice] eventdns: Nameserver <ISP-resolver2>:53 is back up
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23113#comment:1>
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