check.go
func (c Check) String() string {
	value := fmt.Sprintf("%v: %s", c.status, c.exitInfoText())
	value += RenderPerfdata(c.perfdata)
	return value
}
func (c Check) String() string {
	value := fmt.Sprintf("%v: %s", c.status, c.exitInfoText())
	value += RenderPerfdata(c.perfdata)
	return value
}
// String representation of the check results, suitable for output and
// parsing by Nagios.