code: func NewMethodMetrics(scope tally.Scope, methodName string, samplingRate float64) MethodMetrics {
  	return MethodMetrics{
  		Errors:         scope.Counter(methodName + ".errors"),
  		Success:        scope.Counter(methodName + ".success"),
  		ErrorsLatency:  MustCreateSampledTimer(scope.Timer(methodName+".errors-latency"), samplingRate),
  		SuccessLatency: MustCreateSampledTimer(scope.Timer(methodName+".success-latency"), samplingRate),
  	}
  }
docs: // NewMethodMetrics returns a new Method metrics for the given method name.