keep number of measurements in cluster_ tables
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                 Key: CHUKWA-262
                 URL: https://issues.apache.org/jira/browse/CHUKWA-262
             Project: Hadoop Chukwa
          Issue Type: New Feature
          Components: Data Processors
            Reporter: Ari Rabkin
             Fix For: 0.2.0


When we compute an average across a number of machines, it would be good to 
keep track of the number of machines in question. This will alert the user if 
shifts in the average are due to shifts on a bunch of machines, or shifts in 
which machines are reporting.

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