[tor-bugs] #17830 [metrics-lib]: use StringBuilder correctly

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#17830: use StringBuilder correctly
-------------------------+--------------------------
 Reporter:  iwakeh       |          Owner:  karsten
     Type:  defect       |         Status:  accepted
 Priority:  Medium       |      Milestone:
Component:  metrics-lib  |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:  #17822       |         Points:
  Sponsor:               |
-------------------------+--------------------------
Changes (by karsten):

 * status:  new => accepted


Comment:

 Sure, sound like a good change.  (See #17823 for the discussion when to
 make these changes.)

 Regarding coding guidelines, it's quite possible that we wrote these for
 Onionoo only.  We should add this guideline to metrics-lib's CONTRIB.md in
 any case.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17830#comment:1>
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