Used to accumulate store metrics across multiple regions in a region server. These metrics are not "persistent", i.e. we keep overriding them on every update instead of incrementing, so we need to accumulate them in a temporary map before pushing them to the global metric collection.
@param tmpMap a temporary map for accumulating store metrics
@param storeMetricType the store metric type to increment
@param val the value to add to the metric
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