[tor-bugs] #18718 [metrics-lib]: remove last impl. dependency from api

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#18718: remove last impl. dependency from api
-------------------------+-------------------------
 Reporter:  iwakeh       |          Owner:  karsten
     Type:  defect       |         Status:  new
 Priority:  Medium       |      Milestone:
Component:  metrics-lib  |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:  #18746       |         Points:
 Reviewer:               |        Sponsor:
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Changes (by iwakeh):

 * parent:   => #18746


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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18718#comment:6>
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