[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:  needs_revision
 Priority:  Medium       |      Milestone:
Component:  Metrics      |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
 Reviewer:               |        Sponsor:
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Comment (by karsten):

 Looks good to me.  Let's also hear what RaBe says about where fonts are
 taken from.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21376#comment:5>
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