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

[Tor Bug Tracker & Wiki]

#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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Changes (by irl):

 * status:  needs_review => merge_ready


Comment:

 Onionoo, ExoneraTor and metrics-web are also looking good. I think it is
 fine to merge these changes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27234#comment:7>
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