[metrics-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:
                                                 |  metrics-team
     Type:  enhancement                          |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:
Component:  Metrics/Onionperf                    |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  metrics-team-roadmap-2020, metrics-  |  Actual Points:  0.3
  team-roadmap-2020-june                         |
Parent ID:  #33321                               |         Points:  2.0
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor59-must
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Comment (by mikeperry):

 I have not dug deep into this, but as a quick note: recall that it takes
 at least 1000 seconds after you get a BUILDTIMEOUT_SET RESET event before
 you'll get a BUILDTIMEOUT_SET COMPUTED event. This means there will be no
 `build_quantile` or `build_timeout` value during this time.

 So without filtering those measurements, you will have plenty of
 measurements without a `build_quantile` and a `build_timeout`. This is
 normal. Unless you were already filtering these measurements, in which
 case, there is an issue with that filter in the onionperf codebase. I hope
 that is not an issue!

 At any rate, I committed the state file sync to the DROPTIMEOUTS command:
 https://github.com/mikeperry-
 tor/tor/commit/2e341098f9388e02d849feca161d8992c2645427

 https://github.com/mikeperry-tor/tor/commits/droptimeouts

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33420#comment:13>
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