[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:  merge_ready
 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):

 Please check the [https://gitweb.torproject.org/user/iwakeh/metrics-
 lib.git/?h=task-19607-4 one commit] including all.  I also adapted the
 changelog a bit.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19607#comment:20>
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