[metrics-bugs] #21220 [Metrics/Metrics website]: remove data entries for non-existing or not-anymore-existing countries

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#21220: remove data entries for non-existing or not-anymore-existing countries
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     Reporter:  iwakeh                   |      Owner:  metrics-team
         Type:  defect                   |     Status:  new
     Priority:  Medium                   |  Milestone:
    Component:  Metrics/Metrics website  |    Version:
     Severity:  Minor                    |   Keywords:
Actual Points:                           |  Parent ID:
       Points:                           |   Reviewer:
      Sponsor:                           |
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 The client dataset `client.csv`, `userstats-combined.csv`, and
 `servers.csv` contain some two-letter country codes for non-existing or
 not-anymore-existing countries, i.e. a1, a2, ap, cs, dd, du, eu, which
 won't be used for serving graphs on the Metrics web-site, but which are
 included in the data file.

 Shouldn't these be removed from the data?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21220>
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