[metrics-bugs] #29374 [Metrics/Onionperf]: Analysis files sometimes present negative numbers in the payload_progress field

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#29374: Analysis files sometimes present negative numbers in the payload_progress
field
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 Reporter:  irl                    |          Owner:  metrics-team
     Type:  defect                 |         Status:  new
 Priority:  Medium                 |      Milestone:
Component:  Metrics/Onionperf      |        Version:
 Severity:  Normal                 |     Resolution:
 Keywords:  acute-2019-q1-planned  |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
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Comment (by acute):

 Replying to [comment:10 karsten]:
 > Replying to [comment:9 acute]:
 > > Note this also means that all the produced torperf (*tpf) files will
 have all 'DATAPERC{x}' fields equal to 0.0 for transfers that have
 errored. Any thoughts on this/is this likely to affect things futher down
 the data processing pipeline?
 >
 > Wait, these fields are
 [https://metrics.torproject.org/collector.html#torperf defined] as
 optional. Setting them to 0.0 would mean setting them to 1970-01-01
 00:00:00.000. Can't we just leave these fields out if the corresponding
 events never happened?

 Ah, I see! Very useful link, thank you. This simplifies things, it's very
 easy to exclude them, will update the corresponding PR.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29374#comment:11>
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