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JVM Monitoring

This section describes the types, names, and meanings of JVM metrics collected by APM.

Table 1 Collection parameters for JVM monitoring

Parameter	Data Type	Application Type	Default	Supported Start Agent Version	Supported End Agent Version	Description
Trace Stack Collection Threshold	integer	JAVA	0	2.0.4	-	Stacks will be automatically printed when the request latency exceeds the threshold.

Table 2 JVM monitoring metrics

Category	Metric	Name	Description	Unit	Data Type	Default Aggregation Mode
Class loading (classLoading: JVM class loading statistics)	loadedClassCount	loadedClassCount	Number of loaded classes	-	INT	SUM
	totalLoadedClassCount	totalLoadedClassCount	Total number of loaded classes	-	INT	SUM
	unloadedClassCount	unloadedClassCount	Number of unloaded classes	-	INT	SUM
Compilation (compile: JVM class compilation time statistics)	compilationTime	compilationTime	Compilation time in a collection period	ms	INT	SUM
	totalCompilationTime	totalCompilationTime	Total compilation time	ms	INT	SUM
CPU (CPU: CPU usage statistics of JVM processes)	cpuRatio	cpuRatio	CPU usage of the Java process	%	DOUBLE	AVG
	cpuRatioMax	cpuRatioMax	Maximum CPU usage of the Java process	%	DOUBLE	MAX
	cpuTimeInterval	cpuTimeInterval	CPU time of the Java process in the collection interval	ns	INT	SUM
	processorCount	processorCount	Number of processors	-	INT	SUM
	systemTimeInterval	systemTimeInterval	Collection interval	ns	INT	SUM
	totalCpuTime	totalCpuTime	Total CPU time	ns	INT	SUM
Memory (memory: JVM memory statistics)	directMemoryUsage	directMemoryUsage	Used direct memory	M	INT	AVG
	directMemoryCapacity	directMemoryCapacity	Total direct memory capacity	M	INT	AVG
	heapMemoryUsage	heapMemoryUsage	Used heap memory	M	INT	AVG
	nonHeapMemoryUsage	nonHeapMemoryUsage	Used non-heap memory	M	INT	AVG
	objectPendingFinalizationCount	objectPendingFinalizationCount	Number of objects that are being recycled at the time of collection	-	INT	SUM
Memory pool (memoryPool: statistics collected by JVM memory pool)	committed	committed	Available memory	Byte	INT	SUM
	init	init	Initialized memory	Byte	INT	SUM
	max	max	Maximum memory	Byte	INT	SUM
	name	name	Memory pool name	-	ENUM	LAST
	used	used	Used memory	Byte	INT	SUM
Thread (thread: JVM thread statistics)	currentThreadCpuTime	currentThreadCpuTime	CPU time of the current thread	-	INT	SUM
	currentThreadUserTime	currentThreadUserTime	User time of the current thread	-	INT	SUM
	daemonThreadCount	daemonThreadCount	Number of daemon threads	-	INT	SUM
	deadlockedThreadsCount	deadlockedThreadsCount	Number of deadlock threads	-	INT	SUM
	monitorDeadlockedThreads	monitorDeadlockedThreads	ID list of current deadlock threads	-	INT	SUM
	peakThreadCount	peakThreadCount	Maximum number of threads executed	-	INT	SUM
	threadCount	threadCount	Number of current threads	-	INT	SUM
	totalStartedThreadCount	totalStartedThreadCount	Total number of threads that are started since the Java process is started	-	INT	SUM
	newThreadCount	newThreadCount	Number of threads in the initial state	-	INT	SUM
	runnableThreadCount	runnableThreadCount	Number of running threads	-	INT	SUM
	blockedThreadCount	blockedThreadCount	Number of blocked threads	-	INT	SUM
	waitingThreadCount	waitingThreadCount	Number of pending threads	-	INT	SUM
	timedWaitingThreadCount	timedWaitingThreadCount	Number of threads that timed out	-	INT	SUM
	terminatedThreadCount	terminatedThreadCount	Number of terminated threads	-	INT	SUM

Parent topic: Basic Monitoring