[tor-bugs] #25175 [Metrics/Onionoo]: Change 3 months graphs to 6 months graphs

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#25175: Change 3 months graphs to 6 months graphs
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     Reporter:  karsten          |      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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 As of yesterday (cf. #16513 and #24729), we're retaining bandwidth and
 weights histories on 24 hour granularity for 6 months rather than just 3.
 In 3 months from today (May 2018) we can extend the 3 months graphs to 6
 months graphs with a granularity of 24 hours per data point.

 If we decide to do this, the `"3_month"` string will change to
 `"6_month"`, and the object will contain twice as many values. We should
 make sure that Relay Search can handle this before we make this change.

 Requires a minor protocol version change.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25175>
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