[metrics-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:  needs_review
 Priority:  High     |      Milestone:
Component:  Metrics  |        Version:
 Severity:  Normal   |     Resolution:
 Keywords:           |  Actual Points:
Parent ID:           |         Points:
 Reviewer:           |        Sponsor:
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Comment (by karsten):

 Just pushed another bunch of commits to the branches above.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27234#comment:2>
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