[metrics-bugs] #23286 [Metrics/CollecTor]: use index-json classes from metrics-lib

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#23286: use index-json classes from metrics-lib
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 Reporter:  iwakeh             |          Owner:  metrics-team
     Type:  enhancement        |         Status:  needs_review
 Priority:  Medium             |      Milestone:  CollecTor 1.3.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Changes (by iwakeh):

 * status:  new => needs_review


Comment:

 Please review
 [https://gitweb.torproject.org/user/iwakeh/collector.git/log/?h=task-23286
 this branch].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23286#comment:1>
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