[tor-bugs] #19612 [Metrics/metrics-lib]: confirm to style guide

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#19612: confirm to style guide
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     Reporter:  iwakeh               |      Owner:  karsten
         Type:  task                 |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Metrics/metrics-lib  |    Version:
     Severity:  Normal               |   Keywords:
Actual Points:                       |  Parent ID:  #19611
       Points:                       |   Reviewer:
      Sponsor:                       |
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 verify that metrics-lib complies to the rules.
 make necessary changes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19612>
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