add timestamp to stats

debug/stats/stats.go

@@ -3,17 +3,19 @@ package stats
 
 // Stats provides stats interface
 type Stats interface {
-	// Read a stat snapshot
-	Read() (*Stat, error)
+	// Read stat snapshot
+	Read() ([]*Stat, error)
 	// Write a stat snapshot
 	Write(*Stat) error
 }
 
 // A runtime stat
 type Stat struct {
+	// Timestamp of recording
+	Timestamp int64
 	// Start time as unix timestamp
 	Started int64
-	// Uptime in nanoseconds
+	// Uptime in seconds
 	Uptime int64
 	// Memory usage in bytes
 	Memory uint64