This is one of a series of CLs which will refactor EppMetrics into a value type
and Metrics into a stateless class which will have an export(EppMetrics requestDetails)
method to export EPP metrics in a stateless way. Once EppMetrics is a value
type, I will create a new StackdriverEppMetrics that will also accept the value
type via an incrementRequests(EppMetrics requestDetails), allowing us to
monitor EPP via BigQuery and Stackdriver with minimum code duplication.
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