[tor-bugs] #20521 [Metrics/metrics-lib]: Deprecate `DescriptorReader.setExcludeFiles()` and add two separate methods for loading and saving a history file

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#20521: Deprecate `DescriptorReader.setExcludeFiles()` and add two separate methods
for loading and saving a history file
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 Reporter:  karsten              |          Owner:  karsten
     Type:  enhancement          |         Status:  needs_review
 Priority:  Medium               |      Milestone:  metrics-lib 1.6.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Changes (by karsten):

 * status:  new => needs_review


Comment:

 Please review [https://gitweb.torproject.org/user/karsten/metrics-
 lib.git/log/?h=task-20521 my branch task-20521].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20521#comment:1>
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