[metrics-bugs] #34031 [Metrics/Onionperf]: Figure out warning about unknown error type when exporting .tpf file

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#34031: Figure out warning about unknown error type when exporting .tpf file
-----------------------------------+--------------------------
     Reporter:  karsten            |      Owner:  metrics-team
         Type:  defect             |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:  0.3                |   Reviewer:
      Sponsor:                     |
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 I found this warning on an OnionPerf test instance:

 {{{
 2020-04-27 13:00:01 1587992401.168824 [onionperf] [INFO] saving analysis
 results to /home/cloud/onionperf-data/htdocs/op-nl2-51200-2020-04-27.tpf
 2020-04-27 13:00:01 1587992401.169561 [onionperf] [WARNING] KeyError while
 exporting torperf file, missing key ''PROXY_END_MISC'', skipping transfer
 'transfer50k:2'
 2020-04-27 13:00:01 1587992401.170384 [onionperf] [INFO] done!
 }}}

 I don't have time to look into this yet, but I'll attach log files to find
 out later.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34031>
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