BIND 10 #170: document how stats are collected (via spec files)

[BIND 10 Development]

#170: document how stats are collected (via spec files)
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      Reporter:  larissas    |        Owner:  naokikambe                 
          Type:  task        |       Status:  reviewing                  
      Priority:  major       |    Milestone:  06. 4th Incremental Release
     Component:  statistics  |   Resolution:                             
      Keywords:              |    Sensitive:  0                          
Estimatedhours:  0.0         |        Hours:  0                          
      Billable:  0           |   Totalhours:  0.62                       
      Internal:  0           |  
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Comment(by naokikambe):

 I think we may use ''increase'' method instead of thinking of integer
 overflow. For example, in multi-process module, which isn't exactly auth
 module, each process knows its own total count but it cannot know total
 count of ALL processes.
 In this case, I think, to calculate the total count of ALL processes, the
 stats module must collect the counts from such processes and summarize it.
 In such case, I think the ''increase'' method is useful.
 However if we don't need to think this case, we can disable the
 ''increase'' method.

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Ticket URL: <https://bind10.isc.org/ticket/170#comment:23>
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