[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
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 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:
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Comment (by karsten):

 I made a hopefully even more useful plot that distinguishes between public
 and onion server and that groups errors by OnionPerf/tgen (prefix: TGEN)
 and tor (prefix: TOR). Admitted, it's a lot of information in a single
 plot. It probably needs a fair amount of textual explanation to be
 readable for Tor Metrics users.

 [[Image(op_errors-2019-04-24-2.png​, 700px)]]

 However, I'm afraid that I'm running out of time for the failure analysis.
 Other stuff piles up here, and even though I'd very much enjoy hunting
 bugs, I cannot help with this analysis anymore. Sorry!

 I'm wondering how we could add a graph like this to Tor Metrics. We
 earlier speculated about including more failure information in .tpf files,
 but we would then have to produce new .tpf files for past measurements. Is
 that trivial to do?

 Or would we have to switch to .json files for Tor Metrics? If we'll have
 to use .json files, this may be out of scope for the next months,
 otherwise we could add a graph like this to Tor Metrics very soon.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29787#comment:23>
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