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:  05. 3rd Incremental Release: Serious Secondary
Component:  statistics  |   Resolution:                                                
 Keywords:              |    Sensitive:  0                                             
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Comment(by jinmei):

 I have no substantial comments on the documents.

 While reviewing it I've noticed a few minor editorial nits and directly
 fixed them on the wiki page.  Please check the changes.

 The only technical comment of mine on the description is about this part:

  - tcp -- A number of query counts per a process which Auth servers
 receives in TCP since it sends last
  - udp -- A number of query counts per a process which Auth servers
 receives in UDP since it sends last

 Does this mean the auth server records counter values last time it
 reported to some other modules and only report the diff from the previous
 value?  I'm not sure if this is a good behavior.  If the "previous" value
 is lost in some way, the receiever can never calculate the total number of
 that counter.  Also, what if the auth server reports multiple instances of
 stats-(like) modules?  Does the auth server have to keep the state of the
 "previously reported value" for all possible clients?  I think it's much
 simpler and more flexible if the auth server just reports the total number
 of each counter and have the receiever be responsible for calculating a
 diff between two reports (if necessary).

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Ticket URL: <http://bind10.isc.org/ticket/170#comment:12>
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