[tor-bugs] #27212 [Core Tor/Tor]: Why do bridges run the retry_dns callback?

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#27212: Why do bridges run the retry_dns callback?
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.4.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.4.1-alpha
     Severity:  Normal        |   Keywords:  034-must
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 In a4fcdc5dec, the following roles seem inconsistent:

 {{{
 +  CALLBACK(retry_dns, PERIODIC_EVENT_ROLE_ROUTER),
 +  CALLBACK(check_dns_honesty, PERIODIC_EVENT_ROLE_RELAY),
 }}}

 It's probably unrelated, but I don't think clients write stats:

 {{{
 +  CALLBACK(write_stats_file, PERIODIC_EVENT_ROLE_ALL),
 }}}

 (Do onion services write stats?)

 From https://trac.torproject.org/projects/tor/ticket/27080#comment:4

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27212>
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