Enable configurable TTL-based scope/metric deallocation #150
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Presently, scope and metric caches exist indefinitely. This creates a significant problem for applications dealing with a large number of metrics, particularly if a substantial amount of metrics are emitted infrequently, or if dimensions are volatile (e.g. request-based metrics).
While this doesn't solve memory design issues within Tally, it at least affords the ability to configure if/when old memory should be reaped.