[metrics-bugs] #22196 [Metrics/metrics-lib]: Configure descriptor sources using method chaining

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#22196: Configure descriptor sources using method chaining
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 Reporter:  karsten              |          Owner:  metrics-team
     Type:  enhancement          |         Status:  new
 Priority:  Medium               |      Milestone:  metrics-lib 1.9.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by iwakeh):

 Yes, using overloading here makes sense (and not using the configuration
 methods safes the hassle of determining when configuration is allowed or
 not).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22196#comment:4>
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