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:                             
      Billable:  0           |   Totalhours:                             
      Internal:  0           |  
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Comment(by jinmei):

 Replying to [comment:18 jinmei]:

 > Suppose we handle 100,000 qps, and have a counter of number of queries.
 If it's a 64bit unsigned integer, it won't overflow until 368,452,886,146
 years later.  Even if it's 32bit, it won't overflow until 85 years later.
 >
 Sorry, I've noticed the calculation was incorrect.  These should be
 5,849,424 years and 0.0014 years, respectively:

 {{{
 >>> 2**64 / (3600 * 24 * 365 * 100000)
 5849424.17355072
 >>> 2**32 / (3600 * 24 * 365 * 100000)
 0.0013619251953323186
 }}}
 (ignoring leap years)

 But a 64bit counter still seems more than enough.

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Ticket URL: <http://bind10.isc.org/ticket/170#comment:20>
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