[tor-bugs] #18342 [Metrics/Onionoo]: Provide more accurate reverse DNS results

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#18342: Provide more accurate reverse DNS results
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 Reporter:  cypherpunks      |          Owner:  irl
     Type:  defect           |         Status:  accepted
 Priority:  Medium           |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  metrics-2018     |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by cypherpunks):

 Ok, to summarize what I would like to see:

 * new field: `dns_ptr` Description: DNS PTR record of the relay's primary
 IP address. This field is updated at most once in 12 hours, unless the
 relay's primary IP address changes. Omitted if no lookup request was
 successful yet.

 * change the `host_name` implementation by doing what the current
 description says (#25551)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18342#comment:14>
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