[metrics-bugs] #22583 [Metrics/Library]: Replace code where we iterate over a directory using a Stack with FileVisitor (was: use FileVisitor)

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#22583: Replace code where we iterate over a directory using a Stack with
FileVisitor
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 Reporter:  iwakeh           |          Owner:  metrics-team
     Type:  enhancement      |         Status:  new
 Priority:  Medium           |      Milestone:
Component:  Metrics/Library  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  metrics-help     |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by karsten):

 Make an attempt to make the summary a bit clearer.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22583#comment:2>
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