[tor-bugs] #19607 [Metrics/metrics-lib]: avoid repeated keyword strings

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#19607: avoid repeated keyword strings
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 Reporter:  iwakeh               |          Owner:  iwakeh
     Type:  enhancement          |         Status:  accepted
 Priority:  Medium               |      Milestone:  metrics-lib 1.8.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by iwakeh):

 Pheeew, that took longer than anticipated.  Please review
 [https://gitweb.torproject.org/user/iwakeh/metrics-lib.git/?h=task-19607-3
 my branch]; checks and tests pass.

 (I noticed many places where the interface clean-up will be helpful, but
 we have a different ticket for that.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19607#comment:15>
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