[tor-bugs] #20039 [Metrics/metrics-lib]: integrate `DescriptorIndexCollector` in a fully backward-compatible way

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#20039: integrate `DescriptorIndexCollector` in a fully backward-compatible way
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 Reporter:  iwakeh               |          Owner:  iwakeh
     Type:  enhancement          |         Status:  assigned
 Priority:  Medium               |      Milestone:  metrics-lib 1.4.1
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Changes (by iwakeh):

 * status:  needs_review => assigned
 * milestone:  metrics-lib 1.5.0 => metrics-lib 1.4.1


Comment:

 I'll add the appropriate changes to the branch from comment:3, i.e. when
 there is only a base url download from `<base-url>/index/index.json`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20039#comment:5>
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