[tor-bugs] #22681 [Metrics/Onionoo]: adapt onionoo to use metrics-lib 1.9.0

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#22681: adapt onionoo to use metrics-lib 1.9.0
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     Reporter:  iwakeh           |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 Onionoo's tests won't compile w/metrics-lib 1.9.0.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22681>
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