// MergeMVCCStats merges the results of an MVCC operation or series of
// MVCC operations into the range's stats. The intent age is augmented
// by multiplying the previous intent count by the elapsed nanos since
// the last update to range stats.
func (rs *rangeStats) MergeMVCCStats(e engine.Engine, ms *engine.MVCCStats, nowNanos int64) {
// Augment the current intent age.
diffSeconds := nowNanos/1E9 - rs.LastUpdateNanos/1E9
ms.LastUpdateNanos = nowNanos - rs.LastUpdateNanos
ms.IntentAge += rs.IntentCount * diffSeconds
ms.GCBytesAge += engine.MVCCComputeGCBytesAge(rs.KeyBytes+rs.ValBytes-rs.LiveBytes, diffSeconds)
ms.MergeStats(e, rs.raftID)
}
