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	ms	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	ms	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	ms	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 occurred	-	STRING	LAST
	stackTrace	Exception Stack	Exception stack information	-	CLOB	LAST