ApacheHttpAsyncClient Connection Pool

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

**Table 1** ApacheHttpAsyncClient 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	2.1.6	-	Threshold (ms) for reporting connection traces
Obtain Pool Info or Not	radio	JAVA	1	2.1.6	-	Whether to obtain pool information when getting connections

**Table 2** ApacheHttpAsyncClient connection pool metrics
Category	Metric	Name	Description	Unit	Data Type	Default Aggregation Mode
Connection pool (connectionPool: statistics about ApacheHttpAsyncClient connections in different states)	poolId	Connection Pool ID	ApacheHttpAsyncClient connection pool ID	-	ENUM	LAST
	available	Idle Connections	Number of idle connections in the connection pool	-	INT	SUM
	leased	Occupied Connections	Number of connections occupied	-	INT	SUM
	max	Max. Connections	Maximum number of connections in the connection pool	-	INT	MAX
	pending	Pending Connections	Number of pending connections in the connection pool	-	INT	SUM
Connection pool route (collectionPoolRoute: APM counts connection statistics by pool route.)	poolId	Connection Pool ID	ApacheHttpAsyncClient connection pool ID	-	ENUM	LAST
	route	Route	Routing information of the connection pool	-	ENUM	LAST
	available	Idle Connections	Number of idle connections in the connection pool	-	INT	SUM
	leased	Occupied Connections	Number of connections occupied	-	INT	SUM
	max	Max. Connections	Maximum number of connections in the connection pool	-	INT	MAX
	pending	Pending Connections	Number of pending connections in the connection pool	-	INT	SUM
Connection details (connection)	route	Route	Route	-	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