[metrics-bugs] #20596 [Metrics]: add jdk version to manifest files

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#20596: add jdk version to manifest files
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 Reporter:  iwakeh       |          Owner:  metrics-team
     Type:  enhancement  |         Status:  needs_review
 Priority:  Medium       |      Milestone:
Component:  Metrics      |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
 Reviewer:               |        Sponsor:
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Comment (by iwakeh):

 Replying to [comment:7 iwakeh]:
 > unify all checkstyle rules across Metrics' projects (cf. #20668
 comment:5)

 in addition the "unused imports" rule, which we do not have in all
 projects yet.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20596#comment:8>
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