[tor-bugs] #18685 [Tor]: Fire a`STATUS_SERVER` event when the hibernation state changes.

[Tor Bug Tracker & Wiki]

#18685: Fire a`STATUS_SERVER` event when the hibernation state changes.
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     Reporter:  yawning      |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:  Tor: 0.2.9.x-final
    Component:  Tor          |    Version:
     Severity:  Normal       |   Keywords:  tor-core
Actual Points:               |  Parent ID:  #17284
       Points:               |   Reviewer:
      Sponsor:  SponsorS     |
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 Most of the hibernation related information is already exposed in a useful
 manner via `GETINFO`.  As far as I can tell the only really other useful
 thing to do here is to fire an event whenever we enter/exit hibernation so
 that controllers don't have to poll continuously via `GETINFO`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18685>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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