[metrics-bugs] #21376 [Metrics]: add javadoc metrics style

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#21376: add javadoc metrics style
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     Reporter:  iwakeh       |      Owner:  metrics-team
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Metrics      |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |   Reviewer:
      Sponsor:               |
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 Add common javadoc style to metrics-base.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21376>
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