New creates a metrics interface for creating Counters, Histograms, and Gauges.

Config provides users with the ability to specify namespaces, function handlers and other key information required to execute the function.

Counter provides an Counter metric which can be incremented.

Gauge provides a Gauge metric which can be incremented and decremented.

Histogram provides a Histogram metric which can observe values.

Metrics provides an interface to the host metrics.