[tor-bugs] #21144 [Metrics/metrics-lib]: remove 604 checkstyle complaints from metrics-lib

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#21144: remove 604 checkstyle complaints from metrics-lib
---------------------------------+-----------------------------
 Reporter:  iwakeh               |          Owner:  karsten
     Type:  enhancement          |         Status:  merge_ready
 Priority:  Medium               |      Milestone:
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:  metrics-help         |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
---------------------------------+-----------------------------
Changes (by iwakeh):

 * status:  needs_review => merge_ready


Comment:

 Sure.

 Good to have these cleaned-up.

 All changes look fine, tests, coverage, and checks pass.
 => Ready for merge.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21144#comment:5>
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