[metrics-bugs] #29787 [Metrics/Onionperf]: Enumerate possible failure cases and include failure information in .tpf output

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#29787: Enumerate possible failure cases and include failure information in .tpf
output
-------------------------------+------------------------------
 Reporter:  karsten            |          Owner:  metrics-team
     Type:  enhancement        |         Status:  new
 Priority:  Medium             |      Milestone:
Component:  Metrics/Onionperf  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
-------------------------------+------------------------------

Comment (by karsten):

 Hmm, I'm running into this issue on a fresh Debian Stretch with
 `python3-pandas` installed:

 {{{
 $ python3 op_errors.py --path jsonfiles/
 Traceback (most recent call last):
   File "op_errors.py", line 5, in <module>
     import utils
 ImportError: No module named 'utils'
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29787#comment:8>
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