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

[Tor Bug Tracker & Wiki]

#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 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?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29369#comment:12>
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