[tor-bugs] #33391 [Metrics/Onionperf]: Add new metadata fields and definitions

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#33391: Add new metadata fields and definitions
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     Reporter:  acute              |      Owner:  metrics-team
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:  #33322
       Points:                     |   Reviewer:
      Sponsor:                     |
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 Define the instance metadata fields to help us differentiate experimental
 measurements.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33391>
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