[tor-bugs] #8159 [Tor]: Consolidate thresholds for path build bias and use bias

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#8159: Consolidate thresholds for path build bias and use bias
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 Reporter:  mikeperry    |          Owner:  mikeperry         
     Type:  enhancement  |         Status:  new               
 Priority:  normal       |      Milestone:  Tor: 0.2.5.x-final
Component:  Tor          |        Version:                    
 Keywords:  tor-client   |         Parent:                    
   Points:               |   Actualpoints:                    
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 In #8081, we added the ability to do separate accounting for path use bias
 (in addition to the existing path construction bias implemented
 previously). We likely want to keep these thresholds independent for a
 while, as the Tor network load adapts to ntor and onionskin changes, and
 we otherwise determine the relative failure rates users experience under
 normal circumstances for both construction and circuit use independently.

 However, in the long run it will be easier to reason about the total
 impact on path selection that we allow through the combination of both
 types of failure as a single threshold. This will also simplify some of
 the logging and guard failure logic as well.

 This might even be a tor 0.2.6.x thing, depending on how quickly the
 network transitions to ntor.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8159>
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