[metrics-bugs] #22652 [Metrics/CollecTor]: Adapt CollecTor to metrics-lib 1.9.0

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#22652: Adapt CollecTor to metrics-lib 1.9.0
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 Reporter:  iwakeh             |          Owner:  metrics-team
     Type:  enhancement        |         Status:  needs_review
 Priority:  Medium             |      Milestone:
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by karsten):

 Please find [https://gitweb.torproject.org/karsten/metrics-
 db.git/log/?h=task-22652 my task-22652] with a possible fix for the unit
 tests.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22652#comment:10>
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