text.go
func (m *CirconusMetrics) SetTextValue(metric string, val string) {
	m.tm.Lock()
	defer m.tm.Unlock()
	m.text[metric] = val
}
func (m *CirconusMetrics) SetTextValue(metric string, val string) {
	m.tm.Lock()
	defer m.tm.Unlock()
	m.text[metric] = val
}
// SetTextValue sets a text metric