Metric Summary should have at least option to be in JSON format

[tallpsmith]

From tallpsm...@gmail.com on December 20, 2010 13:29:57

The Log4jSink (now name changed, forget what it is now) output in tab delimited format. This was presumably thought to be useful, but real world uses I've struggled a lot mining the data.

Given python has very nice JSON support built in, and it generally being a very human readable format, I would think it best to at least have it as an option to be output in JSON format (perhaps leaving the default as is).

Original issue: http://code.google.com/p/parfait/issues/detail?id=3