[tor-bugs] #19913 [Metrics/CollecTor]: prevent OOM in CollecTor

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#19913: prevent OOM in CollecTor
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     Reporter:  iwakeh             |      Owner:  iwakeh
         Type:  defect             |     Status:  new
     Priority:  High               |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Major              |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 I encountered an OutOfMemory Error on the mirror using the new release
 1.0.0

 I attach a simple patch in a moment.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19913>
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