shadowing

var (
	InvalidRouteActionError  = eris.New("cannot use shadowing plugin on non-Route_Route route actions")
	UnspecifiedUpstreamError = eris.New("invalid plugin spec: must specify an upstream ref")
	InvalidNumeratorError    = func(num float32) error {
		return eris.Errorf("shadow percentage must be between 0 and 100, received %v", num)
	}
)