[tor-bugs] #24495 [Metrics/Onionoo]: Add aggregated summary documents

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#24495: Add aggregated summary documents
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     Reporter:  irl              |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Low              |  Milestone:
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 This would be incredibly useful for #23782. These could also be a form of
 summary document to give basic stats about the number of relays/bridges
 having a particular value for a property. An example would be:

 https://onionoo.torproject.org/aggregated_summary?group=version

 ```
 {"version":"4.4",
 "next_major_version_scheduled":"2017-12-17",
 "build_revision":"25021a8",
 "relays_published":"2017-12-02 14:00:00",
 "aggregated_relays":{
 "0.3.1.8": 30,
 "0.3.1.9": 34,
 "0.4.5.8": 2
 },
 "bridges_published":"2017-12-02 13:05:07",
 "aggregated_bridges":{
 "0.3.1.8": 31,
 "0.3.1.9": 24,
 "0.4.5.8": 2
 }
 }
 ```

 (not real data)

 You could use this to produce autocompletion lists for the advanced search
 form, but it would also have a secondary use for generating bar charts.

 It should be easy enough to have the group argument be for any Onionoo
 details field.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24495>
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