Refine cache stats: distinguish legit misses from miss errors

Review Request #3190 - Created Nov. 30, 2015 and submitted

Information
Peiyu Wang
pants
peiyu/cache-miss-stats2
2638
046598d...
Reviewers
pants-reviews
benjyw, patricklaw, stuhood, zundel

cache misses due to failures turn out to be fairly frequent, at least from log.
Distinguish legit misses from errors would help us quantify this and take appropriate
actions.

This PR attaches a cause to the miss.

https://travis-ci.org/peiyuwang/pants/builds/93991253

Eric Ayers
Eric Ayers
Eric Ayers
Peiyu Wang
Review request changed

Status: Closed (submitted)

Change Summary:

Merged as fb30d2db66b95d2bb602cbaae60037c18d2710b6

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