histogram.go
func (h *Histogram) RecordValue(v float64) {
	h.rw.Lock()
	h.hist.RecordValue(v)
	h.rw.Unlock()
}
func (h *Histogram) RecordValue(v float64) {
	h.rw.Lock()
	h.hist.RecordValue(v)
	h.rw.Unlock()
}
func ( h * Histogram ) RecordValue ( v float64 ) { h . rw . Lock ( ) h . hist . RecordValue ( v ) h . rw . Unlock ( ) }
// RecordValue records the given value to a histogram instance
RecordValue records the given value to a histogram instance