[tor-bugs] #33420 [Metrics/Onionperf]: Add CBT events to Onionperf result files

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#33420: Add CBT events to Onionperf result files
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 Reporter:  acute                      |          Owner:  karsten
     Type:  enhancement                |         Status:  needs_information
 Priority:  Medium                     |      Milestone:
Component:  Metrics/Onionperf          |        Version:
 Severity:  Normal                     |     Resolution:
 Keywords:  metrics-team-roadmap-2020  |  Actual Points:  0.3
Parent ID:  #33321                     |         Points:  1
 Reviewer:                             |        Sponsor:  Sponsor59-must
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Comment (by mikeperry):

 It makes sense that BUILDTIMEOUT_SET events other than COMPUTED are rare
 in onionperf production instances, because CBT only resets after many
 timeouts, and only SUSPENDs if TLS activity stops.

 For the CBT experiments, the goal is to only include (or only perform)
 measurements when there is a buildtime set. This means either discard or
 don't measure between BUILDTIMEOUT_SET RESET and BUILDTIMEOUT_SET
 COMPUTED. We will also want to include TIMEOUT_RATE and CLOSE_RATE,
 because we will want to see how close those match CUTOFF_QUANTILE in
 practice, as we vary CUTOFF_QUANTILE from the consensus.

 We will also want to be able to filter the results to include/exclude
 certain guard identities and sets of guard nodes. But we'll want to do
 this kind of filtering generally.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33420#comment:7>
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