JFR Explorer

Very early preview version! Idea for this tool by Johannes Bechberger. JFRExplorer on GitHub

JDK11 JDK12 JDK13 JDK14 JDK15 JDK16 JDK17 JDK18 JDK19 JDK20

Name

Category

Label

Attributes

Fields

Duration

JVM -> Internal

Duration

Name	Value
startTime	true
thread	true
stackTrace	false
internal	true

Instant

JVM -> Internal

Instant

Name	Value
startTime	false
thread	true
stackTrace	false
internal	true

Value

JVM -> Internal

Value

Name	Value
startTime	false
thread	true
stackTrace	false
internal	true

Name	Type	Label
value	ulong	Value

Text

JVM -> Internal

Text

Name	Value
startTime	false
thread	true
stackTrace	false
internal	true

Name	Type	Label
text	string	Text

ZThreadDebug

JVM -> GC -> Detailed

ZGC Thread Event

Name	Value
description	Temporary latency measurements used during development and debugging of ZGC
thread	true
internal	true

Name	Type	Label
gcId	uint	GC Identifier
name	string	Name

ThreadStart

Java Application

Java Thread Start

Name	Value
thread	true
startTime	false
stackTrace	true

Name	Type	Label
thread	Thread	New Java Thread
parentThread	Thread	Parent Java Thread

ThreadEnd

Java Application

Java Thread End

Name	Value
thread	true
startTime	false

Name	Type	Label
thread	Thread	Java Thread

ThreadSleep

Java Application

Java Thread Sleep

Name	Value
thread	true
stackTrace	true

Name	Type	ContentType	Label
time	long	millis	Sleep Time

ThreadPark

Java Application

Java Thread Park

Name	Value
thread	true
stackTrace	true

Name	Type	ContentType	Label
parkedClass	Class		Class Parked On
timeout	long	nanos	Park Timeout
until	long	epochmillis	Park Until
address	ulong	address	Address of Object Parked

JavaMonitorEnter

Java Application

Java Monitor Blocked

Name	Value
thread	true
stackTrace	true

Name	Type	ContentType	Label
monitorClass	Class		Monitor Class
previousOwner	Thread		Previous Monitor Owner
address	ulong	address	Monitor Address

JavaMonitorWait

Java Application

Java Monitor Wait

Name	Value
description	Waiting on a Java monitor
thread	true
stackTrace	true

Name	Type	ContentType	Label	Description
monitorClass	Class		Monitor Class	Class of object waited on
notifier	Thread		Notifier Thread	Notifying Thread
timeout	long	millis	Timeout	Maximum wait time
timedOut	boolean		Timed Out	Wait has been timed out
address	ulong	address	Monitor Address	Address of object waited on

JavaMonitorInflate

Java Application

Java Monitor Inflated

Name	Value
thread	true
stackTrace	true

Name	Type	ContentType	Label	Description
monitorClass	Class		Monitor Class
address	ulong	address	Monitor Address
cause	InflateCause		Monitor Inflation Cause	Cause of inflation

SyncOnValueBasedClass

JVM -> Diagnostics

Value Based Class Synchronization

Name	Value
thread	true
stackTrace	true
startTime	false
experimental	true

Name	Type	Label
valueBasedClass	Class	Value Based Class

ReservedStackActivation

JVM -> Runtime

Reserved Stack Activation

Name	Value
description	Activation of Reserved Stack Area caused by stack overflow with ReservedStackAccess annotated method in call stack
thread	true
stackTrace	true
startTime	false

Name	Type	Label
method	Method	Java Method

ClassLoad

JVM -> Class Loading

Class Load

Name	Value
thread	true
stackTrace	true

Name	Type	Label
loadedClass	Class	Loaded Class
definingClassLoader	ClassLoader	Defining Class Loader
initiatingClassLoader	ClassLoader	Initiating Class Loader

ClassDefine

JVM -> Class Loading

Class Define

Name	Value
thread	true
stackTrace	true
startTime	false

Name	Type	Label
definedClass	Class	Defined Class
definingClassLoader	ClassLoader	Defining Class Loader

ClassRedefinition

JVM -> Class Loading

Class Redefinition

Name	Value
thread	false
stackTrace	false
startTime	false

Name	Type	Label	Description
redefinedClass	Class	Redefined Class
classModificationCount	int	Class Modification Count	The number of times the class has changed
redefinitionId	ulong	Class Redefinition Id

RedefineClasses

JVM -> Class Loading

Redefine Classes

Name	Value
thread	true
stackTrace	true

Name	Type	Label
classCount	int	Class Count
redefinitionId	ulong	Class Redefinition Id

RetransformClasses

JVM -> Class Loading

Retransform Classes

Name	Value
thread	true
stackTrace	true

Name	Type	Label
classCount	int	Class Count
redefinitionId	ulong	Class Redefinition Id

ClassUnload

JVM -> Class Loading

Class Unload

Name	Value
thread	true
startTime	false

Name	Type	Label
unloadedClass	Class	Unloaded Class
definingClassLoader	ClassLoader	Defining Class Loader

IntFlagChanged

JVM -> Flag

Int Flag Changed

Name	Value
startTime	false

Name	Type	Label
name	string	Name
oldValue	int	Old Value
newValue	int	New Value
origin	FlagValueOrigin	Origin

UnsignedIntFlagChanged

JVM -> Flag

Unsigned Int Flag Changed

Name	Value
startTime	false

Name	Type	Label
name	string	Name
oldValue	uint	Old Value
newValue	uint	New Value
origin	FlagValueOrigin	Origin

LongFlagChanged

JVM -> Flag

Long Flag Changed

Name	Value
startTime	false

Name	Type	Label
name	string	Name
oldValue	long	Old Value
newValue	long	New Value
origin	FlagValueOrigin	Origin

UnsignedLongFlagChanged

JVM -> Flag

Unsigned Long Flag Changed

Name	Value
startTime	false

Name	Type	Label
name	string	Name
oldValue	ulong	Old Value
newValue	ulong	New Value
origin	FlagValueOrigin	Origin

DoubleFlagChanged

JVM -> Flag

Double Flag Changed

Name	Value
startTime	false

Name	Type	Label
name	string	Name
oldValue	double	Old Value
newValue	double	New Value
origin	FlagValueOrigin	Origin

BooleanFlagChanged

JVM -> Flag

Boolean Flag Changed

Name	Value
startTime	false

Name	Type	Label
name	string	Name
oldValue	boolean	Old Value
newValue	boolean	New Value
origin	FlagValueOrigin	Origin

StringFlagChanged

JVM -> Flag

String Flag Changed

Name	Value
startTime	false

Name	Type	Label
name	string	Name
oldValue	string	Old Value
newValue	string	New Value
origin	FlagValueOrigin	Origin

GCHeapSummary

JVM -> GC -> Heap

Heap Summary

Name	Value
startTime	false

Name	Type	ContentType	Label	Description
gcId	uint		GC Identifier
when	GCWhen		When
heapSpace	VirtualSpace		Heap Space
heapUsed	ulong	bytes	Heap Used	Bytes allocated by objects in the heap

MetaspaceSummary

JVM -> GC -> Heap

Metaspace Summary

Name	Value
startTime	false

Name	Type	ContentType	Label
gcId	uint		GC Identifier
when	GCWhen		When
gcThreshold	ulong	bytes	GC Threshold
metaspace	MetaspaceSizes		Total
dataSpace	MetaspaceSizes		Data
classSpace	MetaspaceSizes		Class

MetaspaceGCThreshold

JVM -> GC -> Metaspace

Metaspace GC Threshold

Name	Value
startTime	false

Name	Type	ContentType	Label
oldValue	ulong	bytes	Old Value
newValue	ulong	bytes	New Value
updater	GCThresholdUpdater		Updater

MetaspaceAllocationFailure

JVM -> GC -> Metaspace

Metaspace Allocation Failure

Name	Value
startTime	false
stackTrace	true

Name	Type	ContentType	Label
classLoader	ClassLoader		Class Loader
hiddenClassLoader	boolean		Hidden Class Loader
size	ulong	bytes	Size
metadataType	MetadataType		Metadata Type
metaspaceObjectType	MetaspaceObjectType		Metaspace Object Type

MetaspaceOOM

JVM -> GC -> Metaspace

Metaspace Out of Memory

Name	Value
startTime	false
stackTrace	true

Name	Type	ContentType	Label
classLoader	ClassLoader		Class Loader
hiddenClassLoader	boolean		Hidden Class Loader
size	ulong	bytes	Size
metadataType	MetadataType		Metadata Type
metaspaceObjectType	MetaspaceObjectType		Metaspace Object Type

MetaspaceChunkFreeListSummary

JVM -> GC -> Metaspace

Metaspace Chunk Free List Summary

Name	Value
startTime	false

Name	Type	ContentType	Label
gcId	uint		GC Identifier
when	GCWhen		When
metadataType	MetadataType		Metadata Type
specializedChunks	ulong		Specialized Chunks
specializedChunksTotalSize	ulong	bytes	Specialized Chunks Total Size
smallChunks	ulong		Small Chunks
smallChunksTotalSize	ulong	bytes	Small Chunks Total Size
mediumChunks	ulong		Medium Chunks
mediumChunksTotalSize	ulong	bytes	Medium Chunks Total Size
humongousChunks	ulong		Humongous Chunks
humongousChunksTotalSize	ulong	bytes	Humongous Chunks Total Size

PSHeapSummary

JVM -> GC -> Heap

Parallel Scavenge Heap Summary

Name	Value
startTime	false

Name	Type	Label
gcId	uint	GC Identifier
when	GCWhen	When
oldSpace	VirtualSpace	Old Space
oldObjectSpace	ObjectSpace	Old Object Space
youngSpace	VirtualSpace	Young Space
edenSpace	ObjectSpace	Eden Space
fromSpace	ObjectSpace	From Space
toSpace	ObjectSpace	To Space

G1HeapSummary

JVM -> GC -> Heap

G1 Heap Summary

Name	Value
startTime	false

Name	Type	ContentType	Label
gcId	uint		GC Identifier
when	GCWhen		When
edenUsedSize	ulong	bytes	Eden Used Size
edenTotalSize	ulong	bytes	Eden Total Size
survivorUsedSize	ulong	bytes	Survivor Used Size
numberOfRegions	uint		Number of Regions

GarbageCollection

JVM -> GC -> Collector

Garbage Collection

Name	Value
description	Garbage collection performed by the JVM

Name	Type	Label	Description
gcId	uint	GC Identifier
name	GCName	Name	The name of the Garbage Collector
cause	GCCause	Cause	The reason for triggering this Garbage Collection
sumOfPauses	Tickspan	Sum of Pauses	Sum of all the times in which Java execution was paused during the garbage collection
longestPause	Tickspan	Longest Pause	Longest individual pause during the garbage collection

SystemGC

JVM -> GC -> Collector

System GC

Name	Value
stackTrace	true
startTime	true
thread	true

Name	Type	Label
invokedConcurrent	boolean	Invoked Concurrent

ParallelOldGarbageCollection

JVM -> GC -> Collector

Parallel Old Garbage Collection

Name	Value
description	Extra information specific to Parallel Old Garbage Collections

Name	Type	ContentType	Label	Description
gcId	uint		GC Identifier
densePrefix	ulong	address	Dense Prefix	The address of the dense prefix, used when compacting

YoungGarbageCollection

JVM -> GC -> Collector

Young Garbage Collection

Name	Value
description	Extra information specific to Young Garbage Collections

Name	Type	Label
gcId	uint	GC Identifier
tenuringThreshold	uint	Tenuring Threshold

OldGarbageCollection

JVM -> GC -> Collector

Old Garbage Collection

Name	Value
description	Extra information specific to Old Garbage Collections

Name	Type	Label
gcId	uint	GC Identifier

G1GarbageCollection

JVM -> GC -> Collector

G1 Young Garbage Collection

Name	Value
description	Extra information specific to G1 Young Garbage Collections

Name	Type	Label
gcId	uint	GC Identifier
type	G1YCType	Type

G1MMU

JVM -> GC -> Detailed

G1 MMU Information

Name	Value
startTime	false

Name	Type	ContentType	Label	Description
gcId	uint		GC Identifier
timeSlice	long	millis	Time Slice	Time slice used to calculate MMU
gcTime	long	millis	GC Time	Time stopped because of GC during last time slice
pauseTarget	long	millis	Pause Target	Max time allowed to be spent on GC during last time slice

EvacuationInformation

JVM -> GC -> Detailed

Evacuation Information

Name	Value
startTime	false

Name	Type	ContentType	Label	Description
gcId	uint		GC Identifier
cSetRegions	uint		Collection Set Regions
cSetUsedBefore	ulong	bytes	Collection Set Before	Memory usage before GC in the collection set regions
cSetUsedAfter	ulong	bytes	Collection Set After	Memory usage after GC in the collection set regions
allocationRegions	uint		Allocation Regions	Regions chosen as allocation regions during evacuation (includes survivors and old space regions)
allocationRegionsUsedBefore	ulong	bytes	Allocation Regions Before	Memory usage before GC in allocation regions
allocationRegionsUsedAfter	ulong	bytes	Allocation Regions After	Memory usage after GC in allocation regions
bytesCopied	ulong	bytes	Bytes Copied
regionsFreed	uint		Regions Freed

GCReferenceStatistics

JVM -> GC -> Reference

GC Reference Statistics

Name	Value
startTime	false
description	Total count of processed references during GC

Name	Type	Label
gcId	uint	GC Identifier
type	ReferenceType	Type
count	ulong	Total Count

ObjectCountAfterGC

JVM -> GC -> Detailed

Object Count after GC

Name	Value
startTime	false

Name	Type	ContentType	Label
gcId	uint		GC Identifier
objectClass	Class		Object Class
count	long		Count
totalSize	ulong	bytes	Total Size

G1EvacuationYoungStatistics

JVM -> GC -> Detailed

G1 Evacuation Statistics for Young

Name	Value
startTime	false
description	Memory related evacuation statistics during GC for the young generation

Name	Type	Label
statistics	G1EvacuationStatistics	Evacuation Statistics

G1EvacuationOldStatistics

JVM -> GC -> Detailed

G1 Evacuation Memory Statistics for Old

Name	Value
startTime	false
description	Memory related evacuation statistics during GC for the old generation

Name	Type	Label
statistics	G1EvacuationStatistics	Evacuation Statistics

G1BasicIHOP

JVM -> GC -> Detailed

G1 Basic IHOP Statistics

Name	Value
startTime	false
description	Basic statistics related to current IHOP calculation

Name	Type	ContentType	Label	Description
gcId	uint		GC Identifier
threshold	ulong	bytes	Current IHOP Threshold	Current IHOP threshold
thresholdPercentage	float	percentage	Current IHOP Threshold	Current IHOP threshold in percent of old generation
targetOccupancy	ulong	bytes	Target Occupancy	Target old generation occupancy to reach at the start of mixed GC
currentOccupancy	ulong	bytes	Current Occupancy	Current old generation occupancy
recentMutatorAllocationSize	ulong	bytes	Recent Mutator Allocation Size	Mutator allocation during mutator operation in the most recent interval
recentMutatorDuration	long	millis	Recent Mutator Duration	Time the mutator ran in the most recent interval
recentAllocationRate	double	bytes-per-second	Recent Allocation Rate	Allocation rate of the mutator in the most recent interval in bytes/second
lastMarkingDuration	long	millis	Last Marking Duration	Last time from the end of the last concurrent start to the first mixed GC

G1AdaptiveIHOP

JVM -> GC -> Detailed

G1 Adaptive IHOP Statistics

Name	Value
startTime	false
description	Statistics related to current adaptive IHOP calculation

Name	Type	ContentType	Label	Description
gcId	uint		GC Identifier
threshold	ulong	bytes	Threshold	Current IHOP Threshold
thresholdPercentage	float	percentage	Threshold	Current IHOP threshold in percent of the internal target occupancy
ihopTargetOccupancy	ulong	bytes	IHOP Target Occupancy	Internal target old generation occupancy to reach at the start of mixed GC
currentOccupancy	ulong	bytes	Current Occupancy	Current old generation occupancy
additionalBufferSize	ulong	bytes	Additional Buffer	Additional buffer size
predictedAllocationRate	double	bytes-per-second	Predicted Allocation Rate	Current predicted allocation rate for the mutator in bytes/second
predictedMarkingDuration	long	millis	Predicted Marking Duration	Current predicted time from the end of the last concurrent start to the first mixed GC
predictionActive	boolean		Prediction Active	Indicates whether the adaptive IHOP prediction is active

PromoteObjectInNewPLAB

JVM -> GC -> Detailed

Promotion in new PLAB

Name	Value
description	Object survived scavenge and was copied to a new Promotion Local Allocation Buffer (PLAB). Supported GCs are Parallel Scavange, G1 and CMS with Parallel New. Due to promotion being done in parallel an object might be reported multiple times as the GC threads race to copy all objects.
thread	true
stackTrace	false
startTime	false

Name	Type	ContentType	Label	Description
gcId	uint		GC Identifier	Identifier signifying GC during which the object was promoted
objectClass	Class		Object Class	Class of promoted object
objectSize	ulong	bytes	Object Size	Size of promoted object
tenuringAge	uint		Object Tenuring Age	Tenuring age of a surviving object before being copied. The tenuring age of an object is a value between 0-15 and is incremented each scavange the object survives. Newly allocated objects have tenuring age 0.
tenured	boolean		Tenured	True if object was promoted to Old space, otherwise the object was aged and copied to a Survivor space
plabSize	ulong	bytes	PLAB Size	Size of the allocated PLAB to which the object was copied

PromoteObjectOutsidePLAB

JVM -> GC -> Detailed

Promotion outside PLAB

Name	Value
description	Object survived scavenge and was copied directly to the heap. Supported GCs are Parallel Scavange, G1 and CMS with Parallel New. Due to promotion being done in parallel an object might be reported multiple times as the GC threads race to copy all objects.
thread	true
stackTrace	false
startTime	false

Name	Type	ContentType	Label	Description
gcId	uint		GC Identifier	Identifier signifying GC during which the object was promoted
objectClass	Class		Object Class	Class of promoted object
objectSize	ulong	bytes	Object Size	Size of promoted object
tenuringAge	uint		Object Tenuring Age	Tenuring age of a surviving object before being copied. The tenuring age of an object is a value between 0-15 and is incremented each scavange the object survives. Newly allocated objects have tenuring age 0.
tenured	boolean		Tenured	True if object was promoted to Old space, otherwise the object was aged and copied to a Survivor space

PromotionFailed

JVM -> GC -> Detailed

Promotion Failed

Name	Value
startTime	false
description	Promotion of an object failed

Name	Type	Label
gcId	uint	GC Identifier
promotionFailed	CopyFailed	Promotion Failed Data
thread	Thread	Running thread

EvacuationFailed

JVM -> GC -> Detailed

Evacuation Failed

Name	Value
startTime	false
description	Evacuation of an object failed

Name	Type	Label
gcId	uint	GC Identifier
evacuationFailed	CopyFailed	Evacuation Failed Data

ConcurrentModeFailure

JVM -> GC -> Detailed

Concurrent Mode Failure

Name	Value
startTime	false
description	Concurrent Mode failed

Name	Type	Label
gcId	uint	GC Identifier

GCPhasePause

JVM -> GC -> Phases

GC Phase Pause

Name	Value
thread	true

Name	Type	Label
gcId	uint	GC Identifier
name	string	Name

GCPhasePauseLevel1

JVM -> GC -> Phases

GC Phase Pause Level 1

Name	Value
thread	true

Name	Type	Label
gcId	uint	GC Identifier
name	string	Name

GCPhasePauseLevel2

JVM -> GC -> Phases

GC Phase Pause Level 2

Name	Value
thread	true

Name	Type	Label
gcId	uint	GC Identifier
name	string	Name

GCPhasePauseLevel3

JVM -> GC -> Phases

GC Phase Pause Level 3

Name	Value
thread	true

Name	Type	Label
gcId	uint	GC Identifier
name	string	Name

GCPhasePauseLevel4

JVM -> GC -> Phases

GC Phase Pause Level 4

Name	Value
thread	true

Name	Type	Label
gcId	uint	GC Identifier
name	string	Name

GCPhaseConcurrent

JVM -> GC -> Phases

GC Phase Concurrent

Name	Value
thread	true

Name	Type	Label
gcId	uint	GC Identifier
name	string	Name

GCPhaseConcurrentLevel1

JVM -> GC -> Phases

GC Phase Concurrent Level 1

Name	Value
thread	true

Name	Type	Label
gcId	uint	GC Identifier
name	string	Name

GCPhaseParallel

JVM -> GC -> Phases

GC Phase Parallel

Name	Value
startTime	true
thread	true
description	GC phases for parallel workers

Name	Type	Label
gcId	uint	GC Identifier
gcWorkerId	uint	GC Worker Identifier
name	string	Name

AllocationRequiringGC

JVM -> GC -> Detailed

Allocation Requiring GC

Name	Value
thread	true
stackTrace	true
startTime	false

Name	Type	ContentType	Label
gcId	uint		Pending GC Identifier
size	ulong	bytes	Allocation Size

TenuringDistribution

JVM -> GC -> Detailed

Tenuring Distribution

Name	Value
startTime	false

Name	Type	ContentType	Label
gcId	uint		GC Identifier
age	uint		Age
size	ulong	bytes	Size

G1HeapRegionTypeChange

JVM -> GC -> Detailed

G1 Heap Region Type Change

Name	Value
description	Information about a G1 heap region type change
startTime	false

Name	Type	ContentType	Label
index	uint		Index
from	G1HeapRegionType		From
to	G1HeapRegionType		To
start	ulong	address	Start
used	ulong	bytes	Used

Compilation

JVM -> Compiler

Compilation

Name	Value
thread	true
commitState	_thread_in_native

Name	Type	ContentType	Label
compileId	uint		Compilation Identifier
compiler	CompilerType		Compiler
method	Method		Method
compileLevel	ushort		Compilation Level
succeded	boolean		Succeeded
isOsr	boolean		On Stack Replacement
codeSize	ulong	bytes	Compiled Code Size
inlinedBytes	ulong	bytes	Inlined Code Size

CompilerPhase

JVM -> Compiler

Compiler Phase

Name	Value
thread	true

Name	Type	Label
phase	CompilerPhaseType	Compile Phase
compileId	uint	Compilation Identifier
phaseLevel	ushort	Phase Level

CompilationFailure

JVM -> Compiler

Compilation Failure

Name	Value
thread	true
startTime	false

Name	Type	Label
failureMessage	string	Failure Message
compileId	uint	Compilation Identifier

CompilerInlining

JVM -> Compiler -> Optimization

Method Inlining

Name	Value
thread	true
startTime	false
commitState	_thread_in_native

Name	Type	Label
compileId	uint	Compilation Identifier
caller	Method	Caller Method
callee	CalleeMethod	Callee Method
succeeded	boolean	Succeeded
message	string	Message
bci	int	Bytecode Index

SweepCodeCache

JVM -> Code Sweeper

Sweep Code Cache

Name	Value
thread	true

Name	Type	Label
sweepId	int	Sweep Identifier
sweptCount	uint	Methods Swept
flushedCount	uint	Methods Flushed
zombifiedCount	uint	Methods Zombified

CodeCacheFull

JVM -> Code Cache

Code Cache Full

Name	Value
thread	true
startTime	false

Name	Type	ContentType	Label
codeBlobType	CodeBlobType		Code Heap
startAddress	ulong	address	Start Address
commitedTopAddress	ulong	address	Commited Top
reservedTopAddress	ulong	address	Reserved Top
entryCount	int		Entries
methodCount	int		Methods
adaptorCount	int		Adaptors
unallocatedCapacity	ulong	bytes	Unallocated
fullCount	int		Full Count

Deoptimization

JVM -> Compiler

Deoptimization

Name	Value
thread	true
stackTrace	true
startTime	false

Name	Type	Label
compileId	uint	Compilation Identifier
compiler	CompilerType	Compiler
method	Method	Method
lineNumber	int	Line Number
bci	int	Bytecode Index
instruction	Bytecode	Instruction
reason	DeoptimizationReason	Reason
action	DeoptimizationAction	Action

SafepointBegin

JVM -> Runtime -> Safepoint

Safepoint Begin

Name	Value
description	Safepointing begin
thread	true

Name	Type	Label	Description
safepointId	ulong	Safepoint Identifier
totalThreadCount	int	Total Threads	The total number of threads at the start of safe point
jniCriticalThreadCount	int	JNI Critical Threads	The number of threads in JNI critical sections

SafepointStateSynchronization

JVM -> Runtime -> Safepoint

Safepoint State Synchronization

Name	Value
description	Synchronize run state of threads
thread	true

Name	Type	Label	Description
safepointId	ulong	Safepoint Identifier
initialThreadCount	int	Initial Threads	The number of threads running at the beginning of state check
runningThreadCount	int	Running Threads	The number of threads still running
iterations	int	Iterations	Number of state check iterations

SafepointCleanup

JVM -> Runtime -> Safepoint

Safepoint Cleanup

Name	Value
description	Safepointing begin running cleanup tasks
thread	true

Name	Type	Label
safepointId	ulong	Safepoint Identifier

SafepointCleanupTask

JVM -> Runtime -> Safepoint

Safepoint Cleanup Task

Name	Value
description	Safepointing begin running cleanup tasks
thread	true

Name	Type	Label	Description
safepointId	ulong	Safepoint Identifier
name	string	Task Name	The task name

SafepointEnd

JVM -> Runtime -> Safepoint

Safepoint End

Name	Value
description	Safepointing end
thread	true

Name	Type	Label
safepointId	ulong	Safepoint Identifier

ExecuteVMOperation

JVM -> Runtime

VM Operation

Name	Value
description	Execution of a VM Operation
thread	true

Name	Type	Label	Description
operation	VMOperationType	Operation
safepoint	boolean	At Safepoint	If the operation occured at a safepoint
blocking	boolean	Caller Blocked	If the calling thread was blocked until the operation was complete
caller	Thread	Caller	Thread requesting operation. If non-blocking, will be set to 0 indicating thread is unknown
safepointId	ulong	Safepoint Identifier	The safepoint (if any) under which this operation was completed

Shutdown

JVM -> Runtime

JVM Shutdown

Name	Value
description	JVM shutting down
thread	true
stackTrace	true
startTime	false

Name	Type	Label	Description
reason	string	Reason	Reason for JVM shutdown

ObjectAllocationInNewTLAB

Java Application

Allocation in new TLAB

Name	Value
description	Allocation in new Thread Local Allocation Buffer
thread	true
stackTrace	true
startTime	false

Name	Type	ContentType	Label	Description
objectClass	Class		Object Class	Class of allocated object
allocationSize	ulong	bytes	Allocation Size
tlabSize	ulong	bytes	TLAB Size

ObjectAllocationOutsideTLAB

Java Application

Allocation outside TLAB

Name	Value
description	Allocation outside Thread Local Allocation Buffers
thread	true
stackTrace	true
startTime	false

Name	Type	ContentType	Label	Description
objectClass	Class		Object Class	Class of allocated object
allocationSize	ulong	bytes	Allocation Size

ObjectAllocationSample

Java Application

Object Allocation Sample

Name	Value
thread	true
stackTrace	true
startTime	false
throttle	true

Name	Type	ContentType	Label	Description
objectClass	Class		Object Class	Class of allocated object
weight	long	bytes	Sample Weight	The relative weight of the sample. Aggregating the weights for a large number of samples, for a particular class, thread or stack trace, gives a statistically accurate representation of the allocation pressure

OldObjectSample

JVM -> Profiling

Old Object Sample

Name	Value
description	A potential memory leak
stackTrace	true
thread	true
startTime	false
cutoff	true

Name	Type	ContentType	Label	Description
allocationTime	Ticks		Allocation Time
objectSize	ulong	bytes	Object Size
objectAge	Tickspan		Object Age
lastKnownHeapUsage	ulong	bytes	Last Known Heap Usage
object	OldObject		Object
arrayElements	int		Array Elements	If the object is an array, the number of elements, or -1 if it is not an array
root	OldObjectGcRoot		GC Root

DumpReason

Flight Recorder

Recording Reason

Name	Value
description	Who requested the recording and why
startTime	false

Name	Type	Label	Description
reason	string	Reason	Reason for writing recording data to disk
recordingId	int	Recording Id	Id of the recording that triggered the dump, or -1 if it was not related to a recording

DataLoss

Flight Recorder

Data Loss

Name	Value
description	Data could not be copied out from a buffer, typically because of contention
startTime	false

Name	Type	ContentType	Label	Description
amount	ulong	bytes	Amount	Amount lost data
total	ulong	bytes	Total	Total lost amount for thread

JVMInformation

JVM

JVM Information

Name	Value
description	Description of JVM and the Java application
period	endChunk

Name	Type	ContentType	Label
jvmName	string		JVM Name
jvmVersion	string		JVM Version
jvmArguments	string		JVM Command Line Arguments
jvmFlags	string		JVM Settings File Arguments
javaArguments	string		Java Application Arguments
jvmStartTime	long	epochmillis	JVM Start Time
pid	long		Process Identifier

OSInformation

Operating System

OS Information

Name	Value
period	endChunk

Name	Type	Label
osVersion	string	OS Version

VirtualizationInformation

Operating System

Virtualization Information

Name	Value
period	endChunk

Name	Type	Label
name	string	Name

InitialSystemProperty

JVM

Initial System Property

Name	Value
description	System Property at JVM start
period	endChunk

Name	Type	Label
key	string	Key
value	string	Value

InitialEnvironmentVariable

Operating System

Initial Environment Variable

Name	Value
period	endChunk

Name	Type	Label
key	string	Key
value	string	Value

SystemProcess

Operating System

System Process

Name	Value
period	endChunk

Name	Type	Label
pid	string	Process Identifier
commandLine	string	Command Line

CPUInformation

Operating System -> Processor

CPU Information

Name	Value
period	endChunk

Name	Type	Label
cpu	string	Type
description	string	Description
sockets	uint	Sockets
cores	uint	Cores
hwThreads	uint	Hardware Threads

CPUTimeStampCounter

Operating System -> Processor

CPU Time Stamp Counter

Name	Value
period	endChunk

Name	Type	ContentType	Label
fastTimeEnabled	boolean		Fast Time
fastTimeAutoEnabled	boolean		Trusted Platform
osFrequency	long	hertz	OS Frequency
fastTimeFrequency	long	hertz	Fast Time Frequency

CPULoad

Operating System -> Processor

CPU Load

Name	Value
description	OS CPU Load
period	everyChunk

Name	Type	ContentType	Label
jvmUser	float	percentage	JVM User
jvmSystem	float	percentage	JVM System
machineTotal	float	percentage	Machine Total

ThreadCPULoad

Operating System -> Processor

Thread CPU Load

Name	Value
period	everyChunk
thread	true

Name	Type	ContentType	Label	Description
user	float	percentage	User Mode CPU Load	User mode thread CPU load
system	float	percentage	System Mode CPU Load	System mode thread CPU load

ThreadContextSwitchRate

Operating System -> Processor

Thread Context Switch Rate

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
switchRate	float	hertz	Switch Rate	Number of context switches per second

NetworkUtilization

Operating System -> Network

Network Utilization

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
networkInterface	NetworkInterfaceName		Network Interface	Network Interface Name
readRate	long	bits-per-second	Read Rate	Number of incoming bits per second
writeRate	long	bits-per-second	Write Rate	Number of outgoing bits per second

JavaThreadStatistics

Java Application -> Statistics

Java Thread Statistics

Name	Value
period	everyChunk

Name	Type	Label	Description
activeCount	long	Active Threads	Number of live active threads including both daemon and non-daemon threads
daemonCount	long	Daemon Threads	Number of live daemon threads
accumulatedCount	long	Accumulated Threads	Number of threads created and also started since JVM start
peakCount	long	Peak Threads	Peak live thread count since JVM start or when peak count was reset

ClassLoadingStatistics

Java Application -> Statistics

Class Loading Statistics

Name	Value
period	everyChunk

Name	Type	Label	Description
loadedClassCount	long	Loaded Class Count	Number of classes loaded since JVM start
unloadedClassCount	long	Unloaded Class Count	Number of classes unloaded since JVM start

ClassLoaderStatistics

Java Application -> Statistics

Class Loader Statistics

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
classLoader	ClassLoader		Class Loader
parentClassLoader	ClassLoader		Parent Class Loader
classLoaderData	ulong	address	ClassLoaderData Pointer	Pointer to the ClassLoaderData structure in the JVM
classCount	long		Classes	Number of loaded classes
chunkSize	ulong	bytes	Total Chunk Size	Total size of all allocated metaspace chunks (each chunk has several blocks)
blockSize	ulong	bytes	Total Block Size	Total size of all allocated metaspace blocks (each chunk has several blocks)
hiddenClassCount	long		Hidden Classes	Number of hidden classes
hiddenChunkSize	ulong	bytes	Total Hidden Classes Chunk Size	Total size of all allocated metaspace chunks for hidden classes (each chunk has several blocks)
hiddenBlockSize	ulong	bytes	Total Hidden Classes Block Size	Total size of all allocated metaspace blocks for hidden classes (each chunk has several blocks)

SymbolTableStatistics

JVM -> Runtime -> Tables

Symbol Table Statistics

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
bucketCount	ulong		Bucket Count	Number of buckets
entryCount	ulong		Entry Count	Number of all entries
totalFootprint	ulong	bytes	Total Footprint	Total memory footprint (the table itself plus all of the entries)
bucketCountMaximum	ulong		Maximum Bucket Count	The maximum bucket length (entries in a single bucket)
bucketCountAverage	float		Average Bucket Count	The average bucket length
bucketCountVariance	float		Bucket Count Variance	How far bucket lengths are spread out from their average value
bucketCountStandardDeviation	float		Bucket Count Standard Deviation	How far bucket lengths are spread out from their mean (expected) value
insertionRate	float		Insertion Rate	How many items were added since last event (per second)
removalRate	float		Removal Rate	How many items were removed since last event (per second)

StringTableStatistics

JVM -> Runtime -> Tables

String Table Statistics

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
bucketCount	ulong		Bucket Count	Number of buckets
entryCount	ulong		Entry Count	Number of all entries
totalFootprint	ulong	bytes	Total Footprint	Total memory footprint (the table itself plus all of the entries)
bucketCountMaximum	ulong		Maximum Bucket Count	The maximum bucket length (entries in a single bucket)
bucketCountAverage	float		Average Bucket Count	The average bucket length
bucketCountVariance	float		Bucket Count Variance	How far bucket lengths are spread out from their average value
bucketCountStandardDeviation	float		Bucket Count Standard Deviation	How far bucket lengths are spread out from their mean (expected) value
insertionRate	float		Insertion Rate	How many items were added since last event (per second)
removalRate	float		Removal Rate	How many items were removed since last event (per second)

PlaceholderTableStatistics

JVM -> Runtime -> Tables

Placeholder Table Statistics

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
bucketCount	ulong		Bucket Count	Number of buckets
entryCount	ulong		Entry Count	Number of all entries
totalFootprint	ulong	bytes	Total Footprint	Total memory footprint (the table itself plus all of the entries)
bucketCountMaximum	ulong		Maximum Bucket Count	The maximum bucket length (entries in a single bucket)
bucketCountAverage	float		Average Bucket Count	The average bucket length
bucketCountVariance	float		Bucket Count Variance	How far bucket lengths are spread out from their average value
bucketCountStandardDeviation	float		Bucket Count Standard Deviation	How far bucket lengths are spread out from their mean (expected) value
insertionRate	float		Insertion Rate	How many items were added since last event (per second)
removalRate	float		Removal Rate	How many items were removed since last event (per second)

LoaderConstraintsTableStatistics

JVM -> Runtime -> Tables

Loader Constraints Table Statistics

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
bucketCount	ulong		Bucket Count
entryCount	ulong		Entry Count	Number of all entries
totalFootprint	ulong	bytes	Total Footprint	Total memory footprint (the table itself plus all of the entries)
bucketCountMaximum	ulong		Maximum Bucket Count	The maximum bucket length (entries in a single bucket)
bucketCountAverage	float		Average Bucket Count	The average bucket length
bucketCountVariance	float		Bucket Count Variance	How far bucket lengths are spread out from their average value
bucketCountStandardDeviation	float		Bucket Count Standard Deviation	How far bucket lengths are spread out from their mean (expected) value
insertionRate	float		Insertion Rate	How many items were added since last event (per second)
removalRate	float		Removal Rate	How many items were removed since last event (per second)

ProtectionDomainCacheTableStatistics

JVM -> Runtime -> Tables

Protection Domain Cache Table Statistics

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
bucketCount	ulong		Bucket Count	Number of buckets
entryCount	ulong		Entry Count	Number of all entries
totalFootprint	ulong	bytes	Total Footprint	Total memory footprint (the table itself plus all of the entries)
bucketCountMaximum	ulong		Maximum Bucket Count	The maximum bucket length (entries in a single bucket)
bucketCountAverage	float		Average Bucket Count	The average bucket length
bucketCountVariance	float		Bucket Count Variance	How far bucket lengths are spread out from their average value
bucketCountStandardDeviation	float		Bucket Count Standard Deviation	How far bucket lengths are spread out from their mean (expected) value
insertionRate	float		Insertion Rate	How many items were added since last event (per second)
removalRate	float		Removal Rate	How many items were removed since last event (per second)

ThreadAllocationStatistics

Java Application -> Statistics

Thread Allocation Statistics

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
allocated	ulong	bytes	Allocated	Approximate number of bytes allocated since thread start
thread	Thread		Thread

PhysicalMemory

Operating System -> Memory

Physical Memory

Name	Value
description	OS Physical Memory
period	everyChunk

Name	Type	ContentType	Label	Description
totalSize	ulong	bytes	Total Size	Total amount of physical memory available to OS
usedSize	ulong	bytes	Used Size	Total amount of physical memory in use

ExecutionSample

JVM -> Profiling

Method Profiling Sample

Name	Value
description	Snapshot of a threads state
period	everyChunk

Name	Type	Label
sampledThread	Thread	Thread
stackTrace	StackTrace	Stack Trace
state	ThreadState	Thread State

NativeMethodSample

JVM -> Profiling

Method Profiling Sample Native

Name	Value
description	Snapshot of a threads state when in native
period	everyChunk

Name	Type	Label
sampledThread	Thread	Thread
stackTrace	StackTrace	Stack Trace
state	ThreadState	Thread State

ThreadDump

JVM -> Runtime

Thread Dump

Name	Value
period	everyChunk

Name	Type	Label
result	string	Thread Dump

NativeLibrary

JVM -> Runtime

Native Library

Name	Value
period	everyChunk

Name	Type	ContentType	Label	Description
name	string		Name
baseAddress	ulong	address	Base Address	Starting address of the module
topAddress	ulong	address	Top Address	Ending address of the module

ModuleRequire

JVM -> Runtime -> Modules

Module Require

Name	Value
thread	false
period	everyChunk
description	A directed edge representing a dependency

Name	Type	Label
source	Module	Source Module
requiredModule	Module	Required Module

ModuleExport

JVM -> Runtime -> Modules

Module Export

Name	Value
thread	false
period	everyChunk

Name	Type	Label	Description
exportedPackage	Package	Exported Package
targetModule	Module	Target Module	Module to which the package is qualifiedly exported. If null or N/A, the package is unqualifiedly exported

CompilerStatistics

JVM -> Compiler

Compiler Statistics

Name	Value
thread	false
period	everyChunk
startTime	false

Name	Type	ContentType	Label
compileCount	int		Compiled Methods
bailoutCount	int		Bailouts
invalidatedCount	int		Invalidated Compilations
osrCompileCount	int		OSR Compilations
standardCompileCount	int		Standard Compilations
osrBytesCompiled	ulong	bytes	OSR Bytes Compiled
standardBytesCompiled	ulong	bytes	Standard Bytes Compiled
nmethodsSize	ulong	bytes	Compilation Resulting Size
nmethodCodeSize	ulong	bytes	Compilation Resulting Code Size
peakTimeSpent	long	millis	Peak Time
totalTimeSpent	long	millis	Total time

CompilerConfiguration

JVM -> Compiler

Compiler Configuration

Name	Value
thread	false
period	endChunk
startTime	false

Name	Type	Label
threadCount	int	Thread Count
tieredCompilation	boolean	Tiered Compilation

CodeCacheStatistics

JVM -> Code Cache

Code Cache Statistics

Name	Value
thread	false
period	everyChunk
startTime	false

Name	Type	ContentType	Label
codeBlobType	CodeBlobType		Code Heap
startAddress	ulong	address	Start Address
reservedTopAddress	ulong	address	Reserved Top
entryCount	int		Entries
methodCount	int		Methods
adaptorCount	int		Adaptors
unallocatedCapacity	ulong	bytes	Unallocated
fullCount	int		Full Count

CodeCacheConfiguration

JVM -> Code Cache

Code Cache Configuration

Name	Value
thread	false
period	endChunk
startTime	false

Name	Type	ContentType	Label
initialSize	ulong	bytes	Initial Size
reservedSize	ulong	bytes	Reserved Size
nonNMethodSize	ulong	bytes	Non-nmethod Size
profiledSize	ulong	bytes	Profiled Size
nonProfiledSize	ulong	bytes	Non-profiled Size
expansionSize	ulong	bytes	Expansion size
minBlockLength	ulong	bytes	Minimum Block Length
startAddress	ulong	address	Start Address
reservedTopAddress	ulong	address	Reserved Top

CodeSweeperStatistics

JVM -> Code Sweeper

Code Sweeper Statistics

Name	Value
thread	false
period	everyChunk
startTime	false

Name	Type	Label
sweepCount	int	Sweeps
methodReclaimedCount	int	Methods Reclaimed
totalSweepTime	Tickspan	Time Spent Sweeping
peakFractionTime	Tickspan	Peak Time Fraction Sweep
peakSweepTime	Tickspan	Peak Time Full Sweep

CodeSweeperConfiguration

JVM -> Code Sweeper

Code Sweeper Configuration

Name	Value
thread	false
period	endChunk
startTime	false

Name	Type	ContentType	Label
sweeperEnabled	boolean		Code Sweeper Enabled
flushingEnabled	boolean		Code Cache Flushing Enabled
sweepThreshold	ulong	bytes	Sweep Threshold

IntFlag

JVM -> Flag

Int Flag

Name	Value
period	endChunk

Name	Type	Label
name	string	Name
value	int	Value
origin	FlagValueOrigin	Origin

UnsignedIntFlag

JVM -> Flag

Unsigned Int Flag

Name	Value
period	endChunk

Name	Type	Label
name	string	Name
value	uint	Value
origin	FlagValueOrigin	Origin

LongFlag

JVM -> Flag

Long Flag

Name	Value
period	endChunk

Name	Type	Label
name	string	Name
value	long	Value
origin	FlagValueOrigin	Origin

UnsignedLongFlag

JVM -> Flag

Unsigned Long Flag

Name	Value
period	endChunk

Name	Type	Label
name	string	Name
value	ulong	Value
origin	FlagValueOrigin	Origin

DoubleFlag

JVM -> Flag

Double Flag

Name	Value
period	endChunk

Name	Type	Label
name	string	Name
value	double	Value
origin	FlagValueOrigin	Origin

BooleanFlag

JVM -> Flag

Boolean Flag

Name	Value
period	endChunk

Name	Type	Label
name	string	Name
value	boolean	Value
origin	FlagValueOrigin	Origin

StringFlag

JVM -> Flag

String Flag

Name	Value
period	endChunk

Name	Type	Label
name	string	Name
value	string	Value
origin	FlagValueOrigin	Origin

ObjectCount

JVM -> GC -> Detailed

Object Count

Name	Value
startTime	false
period	everyChunk

Name	Type	ContentType	Label
gcId	uint		GC Identifier
objectClass	Class		Object Class
count	long		Count
totalSize	ulong	bytes	Total Size

G1HeapRegionInformation

JVM -> GC -> Detailed

G1 Heap Region Information

Name	Value
description	Information about a specific heap region in the G1 GC
period	everyChunk

Name	Type	ContentType	Label
index	uint		Index
type	G1HeapRegionType		Type
start	ulong	address	Start
used	ulong	bytes	Used

GCConfiguration

JVM -> GC -> Configuration

GC Configuration

Name	Value
description	The configuration of the garbage collector
period	endChunk

Name	Type	ContentType	Label	Description
youngCollector	GCName		Young Garbage Collector	The garbage collector used for the young generation
oldCollector	GCName		Old Garbage Collector	The garbage collector used for the old generation
parallelGCThreads	uint		Parallel GC Threads	Number of parallel threads to use for garbage collection
concurrentGCThreads	uint		Concurrent GC Threads	Number of concurrent threads to use for garbage collection
usesDynamicGCThreads	boolean		Uses Dynamic GC Threads	Whether a dynamic number of GC threads are used or not
isExplicitGCConcurrent	boolean		Concurrent Explicit GC	Whether System.gc() is concurrent or not
isExplicitGCDisabled	boolean		Disabled Explicit GC	Whether System.gc() will cause a garbage collection or not
pauseTarget	long	millis	Pause Target	Target for GC pauses
gcTimeRatio	uint		GC Time Ratio	Target for runtime vs garbage collection time

GCSurvivorConfiguration

JVM -> GC -> Configuration

GC Survivor Configuration

Name	Value
description	The configuration of the survivors of garbage collection
period	endChunk

Name	Type	Label	Description
maxTenuringThreshold	ubyte	Maximum Tenuring Threshold	Upper limit for the age of how old objects to keep in the survivor area
initialTenuringThreshold	ubyte	Initial Tenuring Threshold	Initial age limit for how old objects to keep in survivor area

GCTLABConfiguration

JVM -> GC -> Configuration

TLAB Configuration

Name	Value
description	The configuration of the Thread Local Allocation Buffers (TLABs)
period	endChunk

Name	Type	ContentType	Label	Description
usesTLABs	boolean		TLABs Used	If Thread Local Allocation Buffers (TLABs) are in use
minTLABSize	ulong	bytes	Minimum TLAB Size
tlabRefillWasteLimit	ulong	bytes	TLAB Refill Waste Limit

GCHeapConfiguration

JVM -> GC -> Configuration

GC Heap Configuration

Name	Value
description	The configuration of the garbage collected heap
period	endChunk

Name	Type	ContentType	Label	Description
minSize	ulong	bytes	Minimum Heap Size
maxSize	ulong	bytes	Maximum Heap Size
initialSize	ulong	bytes	Initial Heap Size
usesCompressedOops	boolean		If Compressed Oops Are Used	If compressed Oops (Ordinary Object Pointers) are enabled
compressedOopsMode	NarrowOopMode		Compressed Oops Mode	The kind of compressed oops being used
objectAlignment	ulong	bytes	Object Alignment	Object alignment (in bytes) on the heap
heapAddressBits	ubyte		Heap Address Size	Heap Address Size (in bits)

YoungGenerationConfiguration

JVM -> GC -> Configuration

Young Generation Configuration

Name	Value
description	The configuration of the young generation of the garbage collected heap
period	endChunk

Name	Type	ContentType	Label	Description
minSize	ulong	bytes	Minimum Young Generation Size
maxSize	ulong	bytes	Maximum Young Generation Size
newRatio	uint		New Ratio	The size of the young generation relative to the tenured generation

ZAllocationStall

JVM -> GC -> Detailed

ZGC Allocation Stall

Name	Value
description	Time spent waiting for memory to become available
thread	true

Name	Type	ContentType	Label
type	ZPageTypeType		Type
size	ulong	bytes	Size

ZPageAllocation

JVM -> GC -> Detailed

ZGC Page Allocation

Name	Value
description	Allocation of a ZPage
thread	true
stackTrace	true

Name	Type	ContentType	Label
type	ZPageTypeType		Type
size	ulong	bytes	Size
flushed	ulong	bytes	Flushed
committed	ulong	bytes	Committed
segments	uint		Segments
nonBlocking	boolean		Non-blocking

ZRelocationSet

JVM -> GC -> Detailed

ZGC Relocation Set

Name	Value
thread	true

Name	Type	ContentType	Label
total	ulong	bytes	Total
empty	ulong	bytes	Empty
relocate	ulong	bytes	Relocate

ZRelocationSetGroup

JVM -> GC -> Detailed

ZGC Relocation Set Group

Name	Value
thread	true

Name	Type	ContentType	Label
type	ZPageTypeType		Type
pages	ulong		Pages
total	ulong	bytes	Total
empty	ulong	bytes	Empty
relocate	ulong	bytes	Relocate

ZStatisticsCounter

JVM -> GC -> Detailed

ZGC Statistics Counter

Name	Value
thread	true
experimental	true

Name	Type	Label
id	ZStatisticsCounterType	Id
increment	ulong	Increment
value	ulong	Value

ZStatisticsSampler

JVM -> GC -> Detailed

ZGC Statistics Sampler

Name	Value
thread	true
experimental	true

Name	Type	Label
id	ZStatisticsSamplerType	Id
value	ulong	Value

ZThreadPhase

JVM -> GC -> Detailed

ZGC Thread Phase

Name	Value
thread	true
experimental	true

Name	Type	Label
gcId	uint	GC Identifier
name	string	Name

ZUncommit

JVM -> GC -> Detailed

ZGC Uncommit

Name	Value
description	Uncommitting of memory
thread	true

Name	Type	ContentType	Label
uncommitted	ulong	bytes	Uncommitted

ZUnmap

JVM -> GC -> Detailed

ZGC Unmap

Name	Value
description	Unmapping of memory
thread	true

Name	Type	ContentType	Label
unmapped	ulong	bytes	Unmapped

ShenandoahHeapRegionStateChange

JVM -> GC -> Detailed

Shenandoah Heap Region State Change

Name	Value
description	Information about a Shenandoah heap region state change
startTime	false

Name	Type	ContentType	Label
index	uint		Index
from	ShenandoahHeapRegionState		From
to	ShenandoahHeapRegionState		To
start	ulong	address	Start
used	ulong	bytes	Used

ShenandoahHeapRegionInformation

JVM -> GC -> Detailed

Shenandoah Heap Region Information

Name	Value
description	Information about a specific heap region in the Shenandoah GC
period	everyChunk

Name	Type	ContentType	Label
index	uint		Index
state	ShenandoahHeapRegionState		State
start	ulong	address	Start
used	ulong	bytes	Used

Flush

Flight Recorder

Flush

Name	Value
thread	false
experimental	true

Name	Type	ContentType	Label
flushId	ulong		Flush Identifier
elements	ulong		Elements Written
size	ulong	bytes	Size Written

HeapDump

JVM -> Diagnostics

Heap Dump

Name	Value
stackTrace	true
thread	true

Name	Type	Label
destination	string	Destination
size	long	Size
gcBeforeDump	boolean	GC Before Dump
onOutOfMemoryError	boolean	On Out of Memory Error

GCLocker

JVM -> GC -> Detailed

GC Locker

Name	Value
startTime	true
thread	true
stackTrace	true

Name	Type	Label	Description
lockCount	uint	Lock Count	The number of Java threads in a critical section when the GC locker is started
stallCount	uint	Stall Count	The number of Java threads stalled by the GC locker

FinalizerStatistics

Java Application -> Statistics

Finalizer Statistics

Name	Value
description	Per class statistics about finalizers
thread	false
startTime	false
period	endChunk

Name	Type	Label	Description
finalizableClass	Class	Class Overriding Finalize
codeSource	Symbol	Code Source	URL from where the class was loaded
objects	ulong	Finalizable Objects on Heap	Number of objects on heap that can be finalized
totalFinalizersRun	ulong	Finalizers Run	Total number of finalizers run since JVM start