[tor-bugs] #18270 [Onionoo]: flush cached hostname when a relay's IP changes

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#18270: flush cached hostname when a relay's IP changes
-----------------------------+-----------------
     Reporter:  cypherpunks  |      Owner:
         Type:  defect       |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Onionoo      |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
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 If the IP address of a relay changes its DNS PTR record is most likely
 also different, use the IP change event as a trigger to flush the cached
 hostname of that relay.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18270>
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