[tor-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:  metrics-2017  |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by iwakeh):

 Use `java.util.Optional` especially for optional values in metrics-lib
 api, for example, the problems in #24012 et al. could have been prevented.
 `Optional` (used in the right places) provides more maintainable and
 readable code.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23752#comment:8>
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