[metrics-bugs] #22154 [Metrics/metrics-lib]: Remove code that was deprecated in the 1.x series

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#22154: Remove code that was deprecated in the 1.x series
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 Reporter:  karsten              |          Owner:  metrics-team
     Type:  enhancement          |         Status:  new
 Priority:  Medium               |      Milestone:  metrics-lib 2.0.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by iwakeh):

 One focus point is DescriptorParserImpl and other places using
 DescriptorFile.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22154#comment:1>
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