[tor-bugs] #19640 [Metrics/metrics-lib]: review and improve interface hierarchy

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#19640: review and improve interface hierarchy
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 Reporter:  iwakeh               |          Owner:  karsten
     Type:  enhancement          |         Status:  new
 Priority:  Medium               |      Milestone:  metrics-lib 2.0.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Changes (by iwakeh):

 * type:  defect => enhancement


Comment:

 see also #17861.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19640#comment:6>
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