[metrics-bugs] #33421 [Metrics/Onionperf]: Track which Guard is used for experimental measurements

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#33421: Track which Guard is used for experimental measurements
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 Reporter:  acute                      |          Owner:  metrics-team
     Type:  enhancement                |         Status:  new
 Priority:  Medium                     |      Milestone:
Component:  Metrics/Onionperf          |        Version:
 Severity:  Normal                     |     Resolution:
 Keywords:  metrics-team-roadmap-2020  |  Actual Points:
Parent ID:  #33321                     |         Points:  3
 Reviewer:                             |        Sponsor:  Sponsor59-must
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Comment (by acute):

 Replying to [comment:4 karsten]:
 > I'm afraid I don't fully understand what this ticket is about. Can you
 flesh this out a bit more to make it clear what needs to be done?

 This is from a meeting we had several months ago about the scalability
 project. I believe Mike Perry is the best person to flesh this out and
 answer your questions.


 > We already store which guards are being used as part of circuit paths.
 We do not store which relays we picked as our guards at the time of
 building circuits, however. What exactly is it that we're currently
 missing in OnionPerf results? What do you refer to by ''measurement
 rotation event''?

 I think ''measurement rotation event'' refers to the moment where we drop
 all the state and change the guard to be measured.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33421#comment:5>
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