GC Monitoring

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

**Table 1** GC metrics
Category	Metric	Name	Description	Unit	Data Type	Default Aggregation Mode
GC statistics (gc)	fullGCCount	Full GC Times	Number of full GC times in a collection period	-	INT	SUM
	fullGCCountTotal	Total Full GC Times	Total number of full GC times	-	INT	SUM
	fullGCTime	Full GC Time	Full GC duration in a collection period	ms	INT	SUM
	fullGCTimeTotal	Total Full GC Time	Total full GC duration	ms	INT	SUM
	fullGCMBeanName	Full GC Recycler	Name of the full GC recycler	-	STRING	LAST
	youngGCCount	Young GC Times	Number of young GC times in a collection period	-	INT	SUM
	youngGCCountTotal	Total Young GC Times	Total number of young GC times	-	INT	SUM
	youngGCTime	Young GC Time	Young GC duration in a collection period	ms	INT	SUM
	youngGCTimeTotal	Total Young GC Time	Total young GC duration	ms	INT	SUM
	youngGCMBeanName	Young GC Recycler	Name of the young GC recycler	-	STRING	LAST
GC details (gcdetail)	action	GC Type	GC type, which can be major or minor	-	ENUM	LAST
	cause	GC Cause	GC cause	-	ENUM	LAST
	name	GC Name	GC collector name	-	STRING	LAST
	count	Count	Number of times that GC has occurred	-	INT	SUM
	totalTime	GC Time	GC duration	ms	INT	SUM
	maxTime	Max. GC Time	Time consumed by the slowest GC	ms	INT	MAX
	detail	GC Details	Details about the slowest GC	-	CLOB	LAST