[tor-bugs] #20440 [Metrics/metrics-lib]: endless wait in BlockingIteratorImpl

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#20440: endless wait in BlockingIteratorImpl
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 Reporter:  iwakeh               |          Owner:  karsten
     Type:  defect               |         Status:  new
 Priority:  High                 |      Milestone:
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by karsten):

 Could this be related to #20421?  The reason why this only affects Onionoo
 with the `--update-only` execution mode might be that Onionoo without that
 execution mode simply accumulates waiting metrics-lib threads without
 anybody noticing.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20440#comment:4>
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