[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:  merge_ready
 Priority:  Medium             |      Milestone:  CollecTor 1.2.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Changes (by iwakeh):

 * status:  needs_review => merge_ready


Comment:

 Looks fine,  all checks and tests pass.

 (happy to rebase #22428 on the new master)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22652#comment:18>
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