Review Request: Made StatisticsProcess accessible from '/statistics/' and added a '/statistics/snapshot.json' endpoint.

[Benjamin Hindman]

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https://reviews.apache.org/r/5270/
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Review request for mesos and John Sirois.


Summary
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See summary.


Diffs
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  src/statistics/statistics.cpp PRE-CREATION 

Diff: https://reviews.apache.org/r/5270/diff


Testing
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make check


Thanks,

Benjamin