metrics

type Initializer interface {
	// NewCounter returns a function to increment for the given metric.
	NewCounter(name string) func(delta uint64)

	// NewGauge returns a function to set the value for the given metric.
	NewGauge(name string) func(value float64)
}

type Map interface {
	// Add adds a new metric to the map.
	Add(key string, delta int64)

	// AddFloat adds a new metric to the map.
	AddFloat(key string, delta float64)

	// Get gets a Var from the Map.
	Get(key string) expvar.Var
}

type Metrics struct {
	// contains filtered or unexported fields
}

type NullMetrics struct{}