[tor-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
-------------------------------+---------------------------------
 Reporter:  iwakeh             |          Owner:  metrics-team
     Type:  enhancement        |         Status:  needs_review
 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 karsten):

 * status:  merge_ready => needs_review


Comment:

 Please review [https://gitweb.torproject.org/karsten/metrics-
 db.git/log/?h=task-22652-3 my task-22652-3 branch] which contains squashed
 commits from my task-22652 branch plus updates to metrics-lib 2.0.0 and to
 libraries in Debian stretch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22652#comment:17>
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