[tor-bugs] #23929 [Metrics/Bot]: Don't tweet statistics from Onionoo when Onionoo is down

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#23929: Don't tweet statistics from Onionoo when Onionoo is down
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     Reporter:  irl          |      Owner:  irl
         Type:  defect       |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Metrics/Bot  |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |   Reviewer:
      Sponsor:               |
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 This has led to an interesting bug that tweets that there are currently
 zero relays running.

 Onionoo is returning "Error 503 Backend fetch failed" currently.

 There needs to be some error handling that marks the data source as
 unusable.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23929>
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