Metric Registry

The MetricRegistry is an interface that may be implemented by different backends to provide concurrent access to metrics. This is not designed for use by users of the API directly, they should use it with the MetricFactory to create metrics using the DSL.

Development Notes

All methods on MetricRegistry return the desired primitive metric contained in a Cats-Effect Resource. This should be used to register and un-register the metric with the underlying concurrent data structure. It should be possible to allow the same metric to be requested multiple times without re-registering or throwing a runtime exception; therefore we recommend implementing some form of reference counting to track claims on each metric.