[metrics-bugs] #22235 [Metrics/Metrics website]: Add new graph showing the average onion service descriptor count per directory

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#22235: Add new graph showing the average onion service descriptor count per
directory
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     Reporter:  karsten                  |      Owner:  metrics-team
         Type:  enhancement              |     Status:  new
     Priority:  Medium                   |  Milestone:
    Component:  Metrics/Metrics website  |    Version:
     Severity:  Normal                   |   Keywords:
Actual Points:                           |  Parent ID:
       Points:                           |   Reviewer:
      Sponsor:                           |
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 Mike asked me a while ago to make a graph showing the average onion
 service descriptor count per relay.  This number could be extrapolated
 from the number of [https://metrics.torproject.org/hidserv-dir-onions-
 seen.html unique .onion addresses], the
 [https://metrics.torproject.org/relayflags.html?flag=HSDir number of
 HSDir-flagged relays], and the information that each descriptor is stored
 on roughly six HSDir-flagged relays.

 I made a sample graph that I'll attach to this ticket together with the
 code to make that graph.

 Let's use this ticket to discuss whether such a graph would be useful to
 have on Tor Metrics, and if so, let's use it to write a useful description
 and work on a metrics-web patch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22235>
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