code: func (m *CirconusMetrics) RecordCountForValue(metric string, val float64, n int64) {
  	hist := m.NewHistogram(metric)
  
  	m.hm.Lock()
  	hist.rw.Lock()
  	hist.hist.RecordValues(val, n)
  	hist.rw.Unlock()
  	m.hm.Unlock()
  }
docs: // RecordCountForValue adds count n for value to a histogram