[tor-bugs] #17823 [metrics-lib]: use diamond operator

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#17823: use diamond operator
-------------------------+------------------------------
 Reporter:  iwakeh       |          Owner:  karsten
     Type:  enhancement  |         Status:  needs_review
 Priority:  Low          |      Milestone:
Component:  metrics-lib  |        Version:
 Severity:  Minor        |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:  #17822       |         Points:
  Sponsor:               |
-------------------------+------------------------------
Changes (by karsten):

 * status:  accepted => needs_review


Comment:

 Please review commit [https://gitweb.torproject.org/user/karsten/metrics-
 lib.git/commit/?h=tasks-17823-17824-17830&id=ce18717907b502dfbc87f4b8567652ffe10fefe5
 ce18717] in [https://gitweb.torproject.org/user/karsten/metrics-
 lib.git/log/?h=tasks-17823-17824-17830 branch tasks-17823-17824-17830 in
 my public repository].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17823#comment:5>
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