[metrics-bugs] #25848 [Metrics/Onionoo]: Replace Gson with Jackson in Onionoo

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#25848: Replace Gson with Jackson in Onionoo
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 Reporter:  iwakeh           |          Owner:  karsten
     Type:  enhancement      |         Status:  needs_review
 Priority:  High             |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:  #25815           |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by iwakeh):

 All ant test and checks pass.  Looks fine except for the comment above and
 that it would be nice to at least adapt the touched
 [https://trac.torproject.org/projects/tor/wiki/org/teams/MetricsTeam/MetricsJavaStyleGuide#Logging
 logging statements to our standards].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25848#comment:6>
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