metrics

type Metrics interface {
	Count(name string, value int64, tags []string, rate float64) error
	Distribution(name string, value float64, tags []string, rate float64) error
	Gauge(name string, value float64, tags []string, rate float64) error
	Histogram(name string, value float64, tags []string, rate float64) error
	Set(name string, value string, tags []string, rate float64) error
	Timing(name string, d time.Duration, tags []string, rate float64) error
	Flush() error
}