[metrics-bugs] #21365 [Metrics/metrics-lib]: metrics-lib might not be thread save

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#21365: metrics-lib might not be thread save
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 Reporter:  iwakeh               |          Owner:  metrics-team
     Type:  defect               |         Status:  new
 Priority:  Medium               |      Milestone:
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by iwakeh):

 My investigations back than for #20440 made me aware of this.

 I'll device a test for (re)producing the concurrency issues in
 BlockingIteratorImpl.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21365#comment:2>
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