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feat: Add metrics counter retrieval (#65)
## Which problem is this PR solving? To date, the samplers have had no way of getting any metrics from them, which has sometimes made it hard to support. This adds a simple GetMetrics call that retrieves a map of named metrics on request. GetMetrics returns a map of metrics about the sampler's performance. All values are returned as int64; counters are cumulative and the names always end with "_count", while gauges are instantaneous with no particular naming convention. All names are prefixed with the string passed in. ## Short description of the changes - Add GetMetrics function to Sampler interface and all samplers
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