Add a new relay metric to more accurately describe cache behavior. #1092
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Why are these changes needed?
Adds a new metric to the relay caches: "cache near miss count". A near miss in this context is defined as a request to the cache for data that is currently being looked up. Such requests are not as good as a cache hit, since a cache hit returns the data with no extra latency. But unlike a true cache miss, a cache near miss does not result in extra network traffic to fetch the data.