[metrics-bugs] #25446 [Metrics/Website]: Add a legend to the comment section of per-graph CSV files

[Tor Bug Tracker & Wiki]

#25446: Add a legend to the comment section of per-graph CSV files
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     Reporter:  karsten          |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Website  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 Based on a discussion in #25387:
 > For the legend descriptions we should open a new ticket as part of the
 sponsor13 work?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25446>
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