[tor-bugs] #25827 [Metrics/CollecTor]: Adapt CollecTor to changes in metrics-lib 2.3.0

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#25827: Adapt CollecTor to changes in metrics-lib 2.3.0
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     Reporter:  iwakeh             |      Owner:  iwakeh
         Type:  task               |     Status:  assigned
     Priority:  Medium             |  Milestone:  CollecTor 1.6.0
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 This concerns changes necessary for #25523.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25827>
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