[tor-bugs] #18354 [Onionoo]: flush cached host_name on IP change

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#18354: flush cached host_name on IP change
-----------------------------+-----------------
     Reporter:  cypherpunks  |      Owner:
         Type:  defect       |     Status:  new
     Priority:  Low          |  Milestone:
    Component:  Onionoo      |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
-----------------------------+-----------------
 description (somehow) implies that the host_name field is reset on IP
 change:
 {{{
 Host name as found in a reverse DNS lookup of the relay IP address. This
 field is updated at most once in 12 hours, unless the relay IP address
 changes. Omitted if the relay IP address was not looked up or if no lookup
 request was successful yet.
 }}}

 this would make sense but that does not seem to be the case:

 {{{
 +-----------------+-----------------+
 | IP              | host_name       |
 +-----------------+-----------------+
 | 162.218.239.125 | 162.218.233.43  |
 | 160.166.216.122 | 160.163.106.82  |
 | 198.96.94.98    | 155.94.246.179  |
 | 198.96.94.122   | 155.94.246.178  |
 | 197.242.119.107 | 154.118.35.110  |
 | 151.20.142.35   | 151.64.24.192   |
 | 151.45.92.96    | 151.45.211.193  |
 | 178.33.156.144  | 149.202.233.205 |
 | 129.21.101.45   | 129.21.102.240  |
 | 117.254.79.156  | 117.252.95.186  |
 | 104.192.0.18    | 104.192.0.22    |
 | 103.44.149.45   | 103.44.149.43   |
 }}}


 Additionally:
 I would suggest to omit the host_name record if IP == host_name (saves
 space).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18354>
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