Ben Kochie 775d26c5e2 Add metrics for cache hits/misses (#375) ...

* Add metrics for cache hits/misses

Add counters for cache middleware hits and misses.

* Add test for cache middleware hit/miss counters.

* Fix cache hit metric incrementing.

* Add cache hit/miss metrics to dnssec middleware.

* Update README metric documentation.

2016-10-31 18:50:50 +00:00

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