[tor-bugs] #2604 [Metrics]: Record circuit build timeouts

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#2604: Record circuit build timeouts
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 Reporter:  karsten      |          Owner:  karsten
     Type:  enhancement  |         Status:  new    
 Priority:  normal       |      Milestone:         
Component:  Metrics      |        Version:         
 Keywords:               |         Parent:         
   Points:               |   Actualpoints:         
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 Torperf should record circuit build time'''outs''', in addition to circuit
 build '''times''' (#2551).  I think we came up with two subtasks:
  1. Learn about the current circuit build timeout and when it changes.
 Mike says we can add an event handler callback for this.
  2. Output this data in some format for subsequent analysis.  I think we
 shouldn't try to squeeze circuit build timeouts into one of the current
 data formats, but should instead write them to a new file.  We need to
 rethink the data formats anyway, but that's not on the list for the
 current Torperf sprint.

 Mike, want to have a look at this task?  It seems you're the person who
 knows best what needs to be modified for the first subtask.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2604>
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