[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:8 karsten]:
 > I didn't work on the implementation yet and would like to leave this to
 others, also as a way to sanity check the concept. If I were to implement
 this I'd probably avoid using the `date_filter` parameter when doing the
 nightly analysis and introduce some sort of `date_prefix` parameter. We
 should just use that `date_filter` by default for all analysis files, and
 we might consider deprecating the `date_prefix` parameter in the user
 interface. When testing this, we'll have to ensure that it works for the
 nightly case as well as the reprocessing case.
 [[br]]
 I'm afraid I don't follow. Don't we accomplish our goal by simply omitting
 the date filter when analysing the results? I don't understand what the
 date prefix should do here.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29369#comment:11>
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