stats: rename PauseNS to LatestPauseNS

stats/mem.go

@@ -26,8 +26,8 @@ type BasicMemStats struct {
 	HeapObjects  uint64 // total number of allocated objects
 
 	// Garbage collector statistics.
-	PauseTotalNs uint64
-	PauseNs      uint64
+	PauseTotalNs  uint64
+	LatestPauseNs uint64
 }
 
 type memStatsPlaceholder interface{}
@@ -73,6 +73,6 @@ func (s *MemStatsWrapper) Update() {
 		s.basic.HeapReleased = s.cache.HeapReleased
 		s.basic.HeapObjects = s.cache.HeapObjects
 		s.basic.PauseTotalNs = s.cache.PauseTotalNs
-		s.basic.PauseNs = s.cache.PauseNs[(s.cache.NumGC+255)%256]
+		s.basic.LatestPauseNs = s.cache.PauseNs[(s.cache.NumGC+255)%256]
 	}
 }