[tor-bugs] #19016 [Metrics/CollecTor]: add shutdown hook

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#19016: add shutdown hook
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 Reporter:  iwakeh             |          Owner:  iwakeh
     Type:  enhancement        |         Status:  needs_review
 Priority:  Low                |      Milestone:  CollecTor 1.1.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:  ctip               |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Changes (by iwakeh):

 * status:  needs_revision => needs_review


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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19016#comment:10>
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