add new index in metrics result and change the parameters passed in Metrics constructor#24

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jameswei wants to merge 1 commit intoobserving:masterfrom

jameswei:master

Commits on Nov 21, 2015

2.the constructor of Metrics should be passed the total amount of requests, but actually is 'cli.amount * cli.args.length'. I think it should be 'cli.amount * cli.messages'
Jia Wei
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