[metrics-bugs] #29369 [Metrics/Onionperf]: Fix message logging and filtering

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#29369: Fix message logging and filtering
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 Reporter:  irl                        |          Owner:  phw
     Type:  defect                     |         Status:  assigned
 Priority:  Medium                     |      Milestone:
Component:  Metrics/Onionperf          |        Version:
 Severity:  Normal                     |     Resolution:
 Keywords:  metrics-team-roadmap-2020  |  Actual Points:  0.4
Parent ID:  #33321                     |         Points:  1.0
 Reviewer:                             |        Sponsor:  Sponsor59-must
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Comment (by phw):

 Replying to [comment:12 karsten]:
 > Without the date prefix the output file written at midnight will
 overwrite the output file from one day before. Do you prefer if I write
 this patch early next week and you review it?
 [[br]]
 I think I now understand. Is this (untested) code what you had in mind?
 https://github.com/NullHypothesis/onionperf/compare/defect/29369

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29369#comment:13>
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