Node.js Status Monitoring

This section describes the types, names, and meanings of Node.js status metrics collected by APM.

**Table 1** Node.js status metrics
Category	Metric	Name	Description	Unit	Data Type	Default Aggregation Mode
cpu	total	Overall CPU Usage	Overall CPU usage	-	DOUBLE	AVG
	sys	System CPU Usage	System CPU usage	-	DOUBLE	AVG
	user	User CPU Usage	User CPU usage	-	DOUBLE	AVG
	nice	Nice CPU Usage	Nice CPU usage	-	DOUBLE	AVG
	irq	IRQ CPU Usage	IRQ CPU usage	-	DOUBLE	AVG
Memory	total	Overall Memory Usage	Overall memory usage	-	DOUBLE	AVG
	rss	RSS Memory Usage	RSS memory usage	-	DOUBLE	AVG
	heapTotal	Total Heap Memory Usage	Total heap memory usage	-	DOUBLE	AVG
	heapUsed	Used Heap Memory Usage	Used heap memory usage	-	DOUBLE	AVG
	external	External Memory Usage	External memory usage	-	DOUBLE	AVG
	arrayBuffers	ArrayBuffers Memory Usage	ArrayBuffers memory usage	-	DOUBLE	AVG
Heap	newSpace	New Space	New space	MB	DOUBLE	AVG
	oldSpace	Old Space	Old space	MB	DOUBLE	AVG
	codeSpace	Code Space	Code space	MB	DOUBLE	AVG
	mapSpace	Map Space	Map space	MB	DOUBLE	AVG
	largeObjectSpace	Large Object Space	Large object space	MB	DOUBLE	AVG