Druid Connection Pool Monitoring

This section describes the types, names, and meanings of Druid connection pool metrics collected by APM.

**Table 1** Druid connection pool collection parameters
Parameter	Data Type	Application Type	Default	Supported Start Agent Version	Supported End Agent Version	Description
Threshold (ms) for Reporting Connection Trace	integer	JAVA	1	2.1.3	-	Threshold for reporting getConnection method traces. If the threshold is not exceeded, such traces will not be reported.
Obtain Pool Info or Not	radio	JAVA	false	2.1.3	-	Whether to obtain pool information when getting connections

**Table 2** Druid connection pool metrics
Category	Metric	Name	Description	Unit	Data Type	Default Aggregation Mode
Data source (dataSource)	url	url	url	-	ENUM	LAST
	dbType	Database Type	Database type	-	STRING	LAST
	driverClassName	Driver	Driver	-	STRING	LAST
	initialSize	Initialized Connections	Number of initialized connections	-	INT	LAST
	minIdle	Min. Idle Connections	Minimum number of idle connections in the pool	-	INT	LAST
	maxIdle	Max. Idle Connections	Maximum number of idle connections in the pool	-	INT	LAST
	maxActive	Max. Pool Size	Maximum connection pool size	-	INT	LAST
	waitThreadCount	Waiting Threads	Number of waiting threads	-	INT	LAST
	maxWaitThreadCount	Max. Waiting Threads	Maximum number of waiting threads	-	INT	LAST
	poolingCount	Pool Connections	Number of connections in the pool	-	INT	LAST
	poolingPeak	Max. Pool Connections	Maximum number of connections in the pool	-	INT	MAX
	activeCount	Active Connections	Number of active connections	-	INT	LAST
	activePeak	Max. Active Connections	Maximum number of active connections	-	INT	MAX
	logicConnectCount	Total Connections	Total number of connections	-	INT	SUM
	maxWait	Max. Waiting Time	Maximum waiting time of a connection	-	INT	LAST
	removeAbandoned	Automatically Reclaim Timeout Connections	Whether to automatically reclaim timeout connections	-	STRING	LAST
	removeAbandonedCount	Timeout Connection Reclaims	Number of times that timeout connections are reclaimed	-	INT	LAST
	removeAbandonedTimeoutMillis	Max. Connection Usage Duration	If a connection in the pool is not returned within the specified duration, the connection will be reclaimed.	-	INT	LAST
	testWhileIdle	Idle Connection Validity Check	Whether to verify the validity of an idle connection when an application applies for it from the pool	-	STRING	LAST
	testOnBorrow	Validity Check Before Obtaining Connection	Check whether a connection is valid before obtaining it from the connection pool.	-	STRING	LAST
	testOnReturn	Validity Check Upon Connection Return	Whether to verify the validity of a connection when it is returned	-	STRING	LAST
	minEvictableIdleTimeMillis	Allowed Idle Time for Connection	Idle time that is allowed for connections in the pool	-	INT	LAST
	timeBetweenEvictionRunsMillis	Interval for Checking Idle Connection Validity	Interval for checking the validity of idle connections	-	INT	LAST
Connection details (connection)	url	Connection Address	Connection address	-	ENUM	LAST
	invokeCount	Calls	Number of calls	-	INT	SUM
	totalTime	Total Time	Total time	-	INT	SUM
	errorCount	Errors	Number of errors	-	INT	SUM
	maxTime	Max. RT	Maximum response time	-	INT	SUM
	range1	0–10 ms	Number of requests with 0–10 ms response time	-	INT	SUM
	range2	10–100 ms	Number of requests with 10–100 ms response time	-	INT	SUM
	range3	100–500 ms	Number of requests with 100–500 ms response time	-	INT	SUM
	range4	500–1000 ms	Number of requests with 500–1000 ms response time	-	INT	SUM
	range5	1–10s	Number of requests with 1–10s response time	-	INT	SUM
	range6	> 10s	Number of requests with response time longer than 10s	-	INT	SUM
	concurrentMax	Max. Concurrency	Maximum concurrency	-	INT	MAX
Version (version)	version	Version	Version	-	STRING	LAST
Exception (exception: exception statistics of Druid calls)	exceptionType	Exception Type	Exception type	-	ENUM	LAST
	causeType	Exception Class	Exception class	-	ENUM	LAST
	count	Count	Number of times the exception has occurred	-	INT	SUM
	message	Exception Message	Message returned when the exception has occurred	-	STRING	LAST
	stackTrace	Exception Stack	Exception stack information	-	CLOB	LAST