[metrics-bugs] #30238 [Metrics/Onionperf]: OnionPerf json analysis file is different than the one recreated from logs

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#30238: OnionPerf json analysis file is different than the one recreated from logs
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 Reporter:  acute   |          Owner:  metrics-team
     Type:  defect  |         Status:  new
 Priority:  Medium  |      Component:  Metrics/Onionperf
  Version:          |       Severity:  Normal
 Keywords:          |  Actual Points:
Parent ID:          |         Points:
 Reviewer:          |        Sponsor:
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 OP creates json analysis files at midnight from the logs collected on the
 respective day. Recreating the json analysis file from the logs collected
 on 01-13-19 on op-ab yields a different result than the json analysis
 created by onionperf at the time of analysis. We should investigate why OP
 was cut short in the middle of the analysis for that particular day (my
 file is 16MB, op-ab's is 7.7MB). When I recreate any of the other json
 files from their respective logs (have tried for ~10 other days), the
 contents and sizes match up.

 We should prevent this  from happening as we may use the json logs for
 analysis.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30238>
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