[tor-bugs] #5830 [Torflow]: Write stream/circ event parser to track circuit use

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#5830: Write stream/circ event parser to track circuit use
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 Reporter:  arma     |          Owner:  aagbsn
     Type:  task     |         Status:  new   
 Priority:  normal   |      Milestone:        
Component:  Torflow  |        Version:        
 Keywords:           |         Parent:  #5752 
   Points:           |   Actualpoints:        
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 As part of #5752 we need to know how many circuits we're making now, how
 many we're discarding early because a stream didn't work, etc.

 I think we could do this as a Tor controller that watches stream and
 circuit events.

 I expect we'll also discover that we don't export enough info via the
 control protocol to make good conclusions; in that case we'll want to
 modify Tor to export this info.

 [I'm not sure what component to put this ticket in, so I picked Torflow
 since it's already pretty good at parsing tor controller output.]

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5830>
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