[metrics-bugs] #23752 [Metrics]: Use Java 8 features in all of Metrics' Java products (Summary ticket)

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#23752: Use Java 8 features in all of Metrics' Java products  (Summary ticket)
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 Reporter:  iwakeh       |          Owner:  metrics-team
     Type:  enhancement  |         Status:  new
 Priority:  Medium       |      Milestone:
Component:  Metrics      |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
 Reviewer:               |        Sponsor:
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Comment (by iwakeh):

 Use java 8 methods from 'Files' wherever useful, e.g., `lines`, `walk`,
 newBufferedReader`, `readAllLines` etc.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23752#comment:3>
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