[tor-bugs] #27234 [Metrics]: Clean up and gently refactor metrics codebases

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#27234: Clean up and gently refactor metrics codebases
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 Reporter:  karsten  |          Owner:  karsten
     Type:  task     |         Status:  merge_ready
 Priority:  High     |      Milestone:
Component:  Metrics  |        Version:
 Severity:  Normal   |     Resolution:
 Keywords:           |  Actual Points:
Parent ID:           |         Points:
 Reviewer:  irl      |        Sponsor:
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Comment (by karsten):

 Thanks a lot for the review! I'm sure it wasn't as much fun. Yet it's
 important to finally make all these changes.

 Regarding `</p>` tags, I didn't know that they are optional. But I'm also
 not sure whether leaving them out is actually an improvement over
 including them. Maybe we can discuss that in the context of writing
 more/better JavaDocs for the five codebases.

 I'll merge all five branches now, so that we can make unrelated changes to
 codebases again. No need to "lock" them any longer than necessary.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27234#comment:8>
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