Communication Protocol

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

**Table 1** WebSocket metrics
Category	Metric	Name	Description	Unit	Data Type	Default Aggregation Mode
Exception (exception: WebSocket exception statistics)	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
WebSocket message monitoring (message: WebSocket message processing information)	url	url	URL corresponding to WebSocket	-	ENUM	LAST
	errorCount	Errors	Number of message processing errors	-	INT	SUM
	errorTraceId	Error Trace ID	ID of the trace that encounters an error in a collection period	-	STRING	LAST
	slowTraceId	Slow Trace ID	ID of the slowest trace in a collection period	-	STRING	LAST
	invokeCount	Calls	Number of times that the message processing method is called	-	INT	SUM
	traffic	Traffic	Traffic	-	INT	SUM
	createSessionCount	Created Connections	Number of connections that have been created	-	INT	SUM
	closeSessionCount	Closed Connections	Number of closed connections	-	INT	SUM
	closeReason	Close Reason	Cause of the connection closure	-	STRING	LAST
	maxTime	Max. RT	Maximum response time	-	INT	MAX
	totalTime	Total RT	Total 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
WebSocket summary (total: summary statistics)	errorCount	Errors	Total number of errors	-	INT	SUM
	invokeCount	Calls	Total number of calls	-	INT	SUM
	createSessionCount	Created Connections	Number of connections that have been created	-	INT	SUM
	closeSessionCount	Closed Connections	Number of closed connections	-	INT	SUM
	traffic	Traffic	Traffic	-	INT	SUM
	totalTime	Total RT	Total response time	-	INT	SUM