[tor-bugs] #19802 [Metrics]: make checkstyle tasks fail when new warnings appear

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#19802: make checkstyle tasks fail when new warnings appear
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     Reporter:  iwakeh       |      Owner:  iwakeh
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Metrics      |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |   Reviewer:
      Sponsor:               |
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 A simple check that fails the task, when checkstyle complains.
 The checkstyle warnings are echoed if the task fails.

 (I was tired of having to look at the results file again and again.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19802>
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