[metrics-bugs] #21143 [Metrics/CollecTor]: remove 18 checkstyle complaints from CollecTor

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#21143: remove 18 checkstyle complaints from CollecTor
-------------------------------+------------------------------
 Reporter:  iwakeh             |          Owner:  metrics-team
     Type:  enhancement        |         Status:  needs_review
 Priority:  Medium             |      Milestone:
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:  metrics-help       |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
-------------------------------+------------------------------
Changes (by karsten):

 * status:  new => needs_review


Comment:

 Please review [https://gitweb.torproject.org/karsten/metrics-
 db.git/commit/?h=task-21143&id=71ce5c8ba4e68fff587d129441a0265b3bc32e66
 this commit in my task-21143 branch].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21143#comment:1>
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