JFR Events

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`size`	`long`	`jdk.jfr.Unsigned`

jdk.BooleanFlag 🔗

Boolean Flag

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`value`	`boolean`
`origin`	`java.lang.String`

jdk.BooleanFlagChanged 🔗

Boolean Flag Changed

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`oldValue`	`boolean`
`newValue`	`boolean`
`origin`	`java.lang.String`

jdk.CPUInformation 🔗

CPU Information

Characteristics and descriptions of the processor(s) the JVM is running on

jdk jdk since 11 Operating System Processor

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`cpu`	`java.lang.String`
`description`	`java.lang.String`
`sockets`	`int`	`jdk.jfr.Unsigned`
`cores`	`int`	`jdk.jfr.Unsigned`
`hwThreads`	`int`	`jdk.jfr.Unsigned`

jdk.CPULoad 🔗

CPU Load

Information about the recent CPU usage of the JVM process

jdk jdk since 11 Operating System Processor

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`jvmUser`	`float`	`jdk.jfr.Percentage`
`jvmSystem`	`float`	`jdk.jfr.Percentage`
`machineTotal`	`float`	`jdk.jfr.Percentage`

jdk.CPUTimeSample 🔗

CPU Time Sample

Snapshot of a threads state from the CPU time sampler, both threads executing native and Java code are included. The throttle setting can be either an upper bound for the event emission rate, e.g. 100/s, or the cpu-time period, e.g. 10ms, with s, ms, us and ns supported as time units.

jdk jdk since 25 Java Virtual Machine Profiling

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`stackTrace`	`jdk.types.StackTrace`
`eventThread`	`java.lang.Thread`
`failed`	`boolean`		Failed to obtain the stack trace
`samplingPeriod`	`long`	`jdk.jfr.Unsigned`
`biased`	`boolean`		The sample is safepoint-biased

jdk.CPUTimeSamplesLost 🔗

CPU Time Samples Lost

Records that the CPU time sampler lost samples

jdk jdk since 25 Java Virtual Machine Profiling

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`lostSamples`	`int`
`eventThread`	`java.lang.Thread`

jdk.CPUTimeStampCounter 🔗

CPU Time Stamp Counter

Information about the CPU time stamp mechanism / (RD)TSC

jdk jdk since 11 Operating System Processor

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`fastTimeEnabled`	`boolean`
`fastTimeAutoEnabled`	`boolean`
`osFrequency`	`long`	`jdk.jfr.Frequency`
`fastTimeFrequency`	`long`	`jdk.jfr.Frequency`

jdk.ClassDefine 🔗

Class Define

jdk jdk since 11 Java Virtual Machine Class Loading

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`definedClass`	`java.lang.Class`
`definingClassLoader`	`jdk.types.ClassLoader`

jdk.ClassLoad 🔗

Class Load

jdk jdk since 11 Java Virtual Machine Class Loading

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`loadedClass`	`java.lang.Class`
`definingClassLoader`	`jdk.types.ClassLoader`
`initiatingClassLoader`	`jdk.types.ClassLoader`

jdk.ClassLoaderStatistics 🔗

Class Loader Statistics

jdk jdk since 11 Java Application Statistics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`classLoader`	`jdk.types.ClassLoader`
`parentClassLoader`	`jdk.types.ClassLoader`
`classLoaderData`	`long`	`jdk.jfr.Unsigned`	Pointer to the ClassLoaderData structure in the JVM
`classCount`	`long`		Number of loaded classes
`chunkSize`	`long`	`jdk.jfr.Unsigned`	Total size of all allocated metaspace chunks (each chunk has several blocks)
`blockSize`	`long`	`jdk.jfr.Unsigned`	Total size of all allocated metaspace blocks (each chunk has several blocks)
`hiddenClassCount`	`long`		Number of hidden classes
`hiddenChunkSize`	`long`	`jdk.jfr.Unsigned`	Total size of all allocated metaspace chunks for hidden classes (each chunk has several blocks)
`hiddenBlockSize`	`long`	`jdk.jfr.Unsigned`	Total size of all allocated metaspace blocks for hidden classes (each chunk has several blocks)

jdk.ClassLoadingStatistics 🔗

Class Loading Statistics

jdk jdk since 11 Java Application Statistics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`loadedClassCount`	`long`		Number of classes loaded since JVM start
`unloadedClassCount`	`long`		Number of classes unloaded since JVM start

jdk.ClassRedefinition 🔗

Class Redefinition

jdk jdk since 17 Java Virtual Machine Class Loading

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`redefinedClass`	`java.lang.Class`
`classModificationCount`	`int`		The number of times the class has changed
`redefinitionId`	`long`	`jdk.jfr.Unsigned`

jdk.ClassUnload 🔗

Class Unload

jdk jdk since 11 Java Virtual Machine Class Loading

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`unloadedClass`	`java.lang.Class`
`definingClassLoader`	`jdk.types.ClassLoader`

jdk.CodeCacheConfiguration 🔗

Code Cache Configuration

jdk jdk since 11 Java Virtual Machine Code Cache

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`initialSize`	`long`	`jdk.jfr.Unsigned`
`reservedSize`	`long`	`jdk.jfr.Unsigned`
`nonNMethodSize`	`long`	`jdk.jfr.Unsigned`
`profiledSize`	`long`	`jdk.jfr.Unsigned`
`nonProfiledSize`	`long`	`jdk.jfr.Unsigned`
`expansionSize`	`long`	`jdk.jfr.Unsigned`
`minBlockLength`	`long`	`jdk.jfr.Unsigned`
`startAddress`	`long`	`jdk.jfr.Unsigned`
`reservedTopAddress`	`long`	`jdk.jfr.Unsigned`

jdk.CodeCacheFull 🔗

Code Cache Full

A code heap is full, this leads to disabling the compiler

jdk jdk since 11 Java Virtual Machine Code Cache

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`codeBlobType`	`java.lang.String`
`startAddress`	`long`	`jdk.jfr.Unsigned`
`commitedTopAddress`	`long`	`jdk.jfr.Unsigned`
`reservedTopAddress`	`long`	`jdk.jfr.Unsigned`
`entryCount`	`int`
`methodCount`	`int`
`adaptorCount`	`int`
`unallocatedCapacity`	`long`	`jdk.jfr.Unsigned`
`fullCount`	`int`
`codeCacheMaxCapacity`	`long`	`jdk.jfr.Unsigned`

jdk.CodeCacheStatistics 🔗

Code Cache Statistics

jdk jdk since 11 Java Virtual Machine Code Cache

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`codeBlobType`	`java.lang.String`
`startAddress`	`long`	`jdk.jfr.Unsigned`
`reservedTopAddress`	`long`	`jdk.jfr.Unsigned`
`entryCount`	`int`
`methodCount`	`int`
`adaptorCount`	`int`
`unallocatedCapacity`	`long`	`jdk.jfr.Unsigned`
`fullCount`	`int`

jdk.Compilation 🔗

Compilation

Results of method compilation attempts

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`compileId`	`int`
`compiler`	`java.lang.String`
`method`	`jdk.types.Method`
`compileLevel`	`short`	`jdk.jfr.Unsigned`
`succeded`	`boolean`
`isOsr`	`boolean`
`codeSize`	`long`	`jdk.jfr.Unsigned`
`inlinedBytes`	`long`	`jdk.jfr.Unsigned`
`arenaBytes`	`long`	`jdk.jfr.Unsigned`

jdk.CompilationFailure 🔗

Compilation Failure

In case a JIT compilation failed, a compilation failure is triggered, reporting the reason

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`failureMessage`	`java.lang.String`
`compileId`	`int`

jdk.CompilerConfiguration 🔗

Compiler Configuration

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`threadCount`	`int`
`tieredCompilation`	`boolean`
`dynamicCompilerThreadCount`	`boolean`

jdk.CompilerInlining 🔗

Method Inlining

Describes the result of a method inlining attempt

jdk jdk since 11 Java Virtual Machine Compiler Optimization

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`compileId`	`int`
`caller`	`jdk.types.Method`
`callee`	`jdk.types.CalleeMethod`
`succeeded`	`boolean`
`message`	`java.lang.String`
`bci`	`int`

jdk.CompilerPhase 🔗

Compiler Phase

Describes various phases of the compilation process like inlining or string optimization related phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`phase`	`java.lang.String`
`compileId`	`int`
`phaseLevel`	`short`	`jdk.jfr.Unsigned`

jdk.CompilerQueueUtilization 🔗

Compiler Queue Utilization

jdk jdk since 22 Java Virtual Machine Compiler

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`compiler`	`java.lang.String`
`addedRate`	`long`	`jdk.jfr.Frequency`	Requests added per second
`removedRate`	`long`	`jdk.jfr.Frequency`	Requests removed per second
`queueSize`	`long`
`peakQueueSize`	`long`
`addedCount`	`long`
`removedCount`	`long`
`totalAddedCount`	`long`
`totalRemovedCount`	`long`
`compilerThreadCount`	`int`

jdk.CompilerStatistics 🔗

Compiler Statistics

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`compileCount`	`int`
`bailoutCount`	`int`
`invalidatedCount`	`int`
`osrCompileCount`	`int`
`standardCompileCount`	`int`
`osrBytesCompiled`	`long`	`jdk.jfr.Unsigned`
`standardBytesCompiled`	`long`	`jdk.jfr.Unsigned`
`nmethodsSize`	`long`	`jdk.jfr.Unsigned`
`nmethodCodeSize`	`long`	`jdk.jfr.Unsigned`
`peakTimeSpent`	`long`	`jdk.jfr.Timespan`
`totalTimeSpent`	`long`	`jdk.jfr.Timespan`

jdk.ConcurrentModeFailure 🔗

Concurrent Mode Failure

Concurrent Mode failed

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`

jdk.ContainerCPUThrottling 🔗

CPU Throttling

Container CPU throttling related information

jdk jdk since 17 Operating System Processor

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`cpuElapsedSlices`	`long`		Number of time-slice periods that have elapsed if a CPU quota has been setup for the container
`cpuThrottledSlices`	`long`		Number of time-slice periods that the CPU has been throttled or limited due to exceeding CPU quota
`cpuThrottledTime`	`long`	`jdk.jfr.Timespan`	Total time duration, in nanoseconds, that the CPU has been throttled or limited due to exceeding CPU quota

jdk.ContainerCPUUsage 🔗

CPU Usage

Container CPU usage related information

jdk jdk since 17 Operating System Processor

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`cpuTime`	`long`	`jdk.jfr.Timespan`	Aggregate time consumed by all tasks in the container
`cpuUserTime`	`long`	`jdk.jfr.Timespan`	Aggregate user time consumed by all tasks in the container
`cpuSystemTime`	`long`	`jdk.jfr.Timespan`	Aggregate system time consumed by all tasks in the container

jdk.ContainerConfiguration 🔗

Container Configuration

A set of container specific attributes

jdk jdk since 17 Operating System

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`containerType`	`java.lang.String`		Container type information
`cpuSlicePeriod`	`long`	`jdk.jfr.Timespan`	Length of the scheduling period for processes within the container
`cpuQuota`	`long`	`jdk.jfr.Timespan`	Total available run-time allowed during each scheduling period for all tasks in the container
`cpuShares`	`long`		Relative weighting of processes with the container used for prioritizing the scheduling of processes across all containers running on a host
`effectiveCpuCount`	`long`		Number of effective processors that this container has available to it
`memorySoftLimit`	`long`	`jdk.jfr.DataAmount`	Hint to the operating system that allows groups to specify the minimum required amount of physical memory
`memoryLimit`	`long`	`jdk.jfr.DataAmount`	Maximum amount of physical memory that can be allocated in the container
`swapMemoryLimit`	`long`	`jdk.jfr.DataAmount`	Maximum amount of physical memory and swap space, in bytes, that can be allocated in the container
`hostTotalMemory`	`long`	`jdk.jfr.DataAmount`	Total memory of the host running the container
`hostTotalSwapMemory`	`long`	`jdk.jfr.DataAmount`	Total swap memory of the host running the container

jdk.ContainerIOUsage 🔗

Container IO Usage

Container IO usage related information

jdk jdk since 17 Operating System File System

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`serviceRequests`	`long`		Number of block IO requests to the disk that have been issued by the container
`dataTransferred`	`long`	`jdk.jfr.DataAmount`	Number of block IO bytes that have been transferred to/from the disk by the container

jdk.ContainerMemoryUsage 🔗

Container Memory Usage

Container memory usage related information

jdk jdk since 17 Operating System Memory

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`memoryFailCount`	`long`		Number of times that user memory requests in the container have exceeded the memory limit
`memoryUsage`	`long`	`jdk.jfr.DataAmount`	Amount of physical memory, in bytes, that is currently allocated in the current container
`swapMemoryUsage`	`long`	`jdk.jfr.DataAmount`	Amount of physical memory and swap space, in bytes, that is currently allocated in the current container

jdk.ContinuationFreeze 🔗

Continuation Yield

Invocation of Continuation.yield()

jdk jdk since 19 Java Virtual Machine Runtime

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`carrierThread`	`java.lang.Thread`		Thread enlisted as a carrier
`continuationClass`	`java.lang.Class`
`interpretedFrames`	`short`	`jdk.jfr.Unsigned`
`size`	`short`	`jdk.jfr.Unsigned`

jdk.ContinuationFreezeFast 🔗

Continuation Freeze Fast

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`id`	`long`	`jdk.jfr.Unsigned`
`size`	`int`	`jdk.jfr.Unsigned`
`allocate`	`boolean`

jdk.ContinuationFreezeSlow 🔗

Continuation Freeze Slow

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`id`	`long`	`jdk.jfr.Unsigned`

jdk.ContinuationThaw 🔗

Continuation Continue

Invocation of Continuation.run() on a started continuation

jdk jdk since 19 Java Virtual Machine Runtime

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`carrierThread`	`java.lang.Thread`		Thread enlisted as a carrier
`continuationClass`	`java.lang.Class`
`interpretedFrames`	`short`	`jdk.jfr.Unsigned`
`size`	`short`	`jdk.jfr.Unsigned`

jdk.ContinuationThawFast 🔗

Continuation Thaw Fast

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`id`	`long`	`jdk.jfr.Unsigned`
`full`	`boolean`
`size`	`int`	`jdk.jfr.Unsigned`

jdk.ContinuationThawSlow 🔗

Continuation Thaw Slow

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`id`	`long`	`jdk.jfr.Unsigned`

jdk.DataLoss 🔗

Data Loss

Data could not be copied out from a buffer, typically because of contention

jdk jdk since 11 Flight Recorder

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`amount`	`long`	`jdk.jfr.Unsigned`	Amount lost data
`total`	`long`	`jdk.jfr.Unsigned`	Total lost amount for thread

jdk.Deoptimization 🔗

Deoptimization

Describes the detection of an uncommon situation in a compiled method which may lead to deoptimization of the method

jdk jdk since 17 Java Virtual Machine Compiler

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`compileId`	`int`
`compiler`	`java.lang.String`
`method`	`jdk.types.Method`
`lineNumber`	`int`
`bci`	`int`
`instruction`	`java.lang.String`
`reason`	`java.lang.String`
`action`	`java.lang.String`

jdk.DeprecatedInvocation 🔗

Deprecated Method Invocation

A unique invocation of a method that is annotated with @Deprecated. Packages and modules that are deprecated are ignored. At most 10 000 invocation sites and only the first invocation from a class is guaranteed to be included.

jdk jdk since 22 Java Application Statistics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`method`	`jdk.types.Method`
`invocationTime`	`long`	`jdk.jfr.Unsigned`	The time the deprecated method was invoked for the first time
`forRemoval`	`boolean`

jdk.Deserialization 🔗

Deserialization

Results of deserialization and ObjectInputFilter checks

jdk jdk since 11 Java Development Kit Serialization

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`filterConfigured`	`boolean`
`filterStatus`	`java.lang.String`
`type`	`java.lang.Class`
`arrayLength`	`int`
`objectReferences`	`long`
`depth`	`long`
`bytesRead`	`long`
`exceptionType`	`java.lang.Class`
`exceptionMessage`	`java.lang.String`

jdk.DirectBufferStatistics 🔗

Direct Buffer Statistics

Statistics of direct buffer

jdk jdk since 17 Java Application Statistics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`maxCapacity`	`long`	`jdk.jfr.DataAmount`	Maximum direct buffer capacity the process can use
`count`	`long`
`totalCapacity`	`long`	`jdk.jfr.DataAmount`
`memoryUsed`	`long`	`jdk.jfr.DataAmount`

jdk.DoubleFlag 🔗

Double Flag

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`value`	`double`
`origin`	`java.lang.String`

jdk.DoubleFlagChanged 🔗

Double Flag Changed

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`oldValue`	`double`
`newValue`	`double`
`origin`	`java.lang.String`

jdk.DumpReason 🔗

Recording Reason

Who requested the recording and why

jdk jdk since 11 Flight Recorder

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`reason`	`java.lang.String`		Reason for writing recording data to disk
`recordingId`	`int`		Id of the recording that triggered the dump, or -1 if it was not related to a recording

jdk.EvacuationFailed 🔗

Evacuation Failed

Evacuation of an object failed

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`evacuationFailed`	`jdk.types.CopyFailed`

jdk.EvacuationInformation 🔗

Evacuation Information

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`cSetRegions`	`int`	`jdk.jfr.Unsigned`
`cSetUsedBefore`	`long`	`jdk.jfr.Unsigned`	Memory usage before GC in the collection set regions
`cSetUsedAfter`	`long`	`jdk.jfr.Unsigned`	Memory usage after GC in the collection set regions
`allocationRegions`	`int`	`jdk.jfr.Unsigned`	Regions chosen as allocation regions during evacuation (includes survivors and old space regions)
`allocationRegionsUsedBefore`	`long`	`jdk.jfr.Unsigned`	Memory usage before GC in allocation regions
`allocationRegionsUsedAfter`	`long`	`jdk.jfr.Unsigned`	Memory usage after GC in allocation regions
`bytesCopied`	`long`	`jdk.jfr.Unsigned`
`regionsFreed`	`int`	`jdk.jfr.Unsigned`

jdk.ExceptionStatistics 🔗

Exception Statistics

Number of objects derived from java.lang.Throwable that have been created

jdk jdk since 11 Java Application Statistics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`throwables`	`long`

jdk.ExecuteVMOperation 🔗

VM Operation

Execution of a VM Operation

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`operation`	`java.lang.String`
`safepoint`	`boolean`		If the operation occurred at a safepoint
`blocking`	`boolean`		If the calling thread was blocked until the operation was complete
`caller`	`java.lang.Thread`		Thread requesting operation. If non-blocking, will be set to 0 indicating thread is unknown
`safepointId`	`long`	`jdk.jfr.Unsigned`	The safepoint (if any) under which this operation was completed

jdk.ExecutionSample 🔗

Java Execution Sample

Snapshot of a thread executing Java code. Threads that are not executing Java code, including those waiting or executing native code, are not included.

jdk jdk since 11 Java Virtual Machine Profiling

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`sampledThread`	`java.lang.Thread`
`stackTrace`	`jdk.types.StackTrace`
`state`	`java.lang.String`

jdk.FileForce 🔗

File Force

Force updates to be written to file

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`path`	`java.lang.String`		Full path of the file
`metaData`	`boolean`		Whether the file metadata is updated

jdk.FileRead 🔗

File Read

Reading data from a file

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`path`	`java.lang.String`		Full path of the file, or N/A if a file descriptor was used to create the stream, for example System.in
`bytesRead`	`long`	`jdk.jfr.DataAmount`	Number of bytes read from the file (possibly 0)
`endOfFile`	`boolean`		If end of file was reached

jdk.FileWrite 🔗

File Write

Writing data to a file

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`path`	`java.lang.String`		Full path of the file, or N/A if a file descriptor was used to create the stream, for example System.out and System.err
`bytesWritten`	`long`	`jdk.jfr.DataAmount`	Number of bytes written to the file

jdk.FinalizerStatistics 🔗

Finalizer Statistics

Per class statistics about finalizers

jdk jdk since 18 Java Application Statistics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`finalizableClass`	`java.lang.Class`
`codeSource`	`java.lang.String`		URL from where the class was loaded
`objects`	`long`	`jdk.jfr.Unsigned`	Number of objects on heap that can be finalized
`totalFinalizersRun`	`long`	`jdk.jfr.Unsigned`	Total number of finalizers run since JVM start

jdk.Flush 🔗

Flush

jdk jdk since 17 Flight Recorder

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`flushId`	`long`	`jdk.jfr.Unsigned`
`elements`	`long`	`jdk.jfr.Unsigned`
`size`	`long`	`jdk.jfr.Unsigned`

jdk.G1AdaptiveIHOP 🔗

G1 Adaptive IHOP Statistics

Statistics related to current adaptive IHOP calculation

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`threshold`	`long`	`jdk.jfr.Unsigned`	Current IHOP Threshold
`thresholdPercentage`	`float`	`jdk.jfr.Percentage`	Current IHOP threshold in percent of the internal target occupancy
`ihopTargetOccupancy`	`long`	`jdk.jfr.Unsigned`	Internal target old generation occupancy to reach at the start of mixed GC
`currentOccupancy`	`long`	`jdk.jfr.Unsigned`	Current old generation occupancy
`additionalBufferSize`	`long`	`jdk.jfr.Unsigned`	Additional buffer size
`predictedAllocationRate`	`double`	`jdk.jfr.DataAmount`	Current predicted allocation rate for the mutator in bytes/second
`predictedMarkingDuration`	`long`	`jdk.jfr.Timespan`	Current predicted time from the end of the last concurrent start to the first mixed GC
`predictionActive`	`boolean`		Indicates whether the adaptive IHOP prediction is active

jdk.G1BasicIHOP 🔗

G1 Basic IHOP Statistics

Basic statistics related to current IHOP calculation

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`threshold`	`long`	`jdk.jfr.Unsigned`	Current IHOP threshold
`thresholdPercentage`	`float`	`jdk.jfr.Percentage`	Current IHOP threshold in percent of old generation
`targetOccupancy`	`long`	`jdk.jfr.Unsigned`	Target old generation occupancy to reach at the start of mixed GC
`currentOccupancy`	`long`	`jdk.jfr.Unsigned`	Current old generation occupancy
`recentMutatorAllocationSize`	`long`	`jdk.jfr.Unsigned`	Mutator allocation during mutator operation in the most recent interval
`recentMutatorDuration`	`long`	`jdk.jfr.Timespan`	Time the mutator ran in the most recent interval
`recentAllocationRate`	`double`	`jdk.jfr.DataAmount`	Allocation rate of the mutator in the most recent interval in bytes/second
`lastMarkingDuration`	`long`	`jdk.jfr.Timespan`	Last time from the end of the last concurrent start to the first mixed GC

jdk.G1EvacuationOldStatistics 🔗

G1 Evacuation Memory Statistics for Old

Memory related evacuation statistics during GC for the old generation

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`statistics`	`jdk.types.G1EvacuationStatistics`

jdk.G1EvacuationYoungStatistics 🔗

G1 Evacuation Statistics for Young

Memory related evacuation statistics during GC for the young generation

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`statistics`	`jdk.types.G1EvacuationStatistics`

jdk.G1GarbageCollection 🔗

G1 Young Garbage Collection

Extra information specific to G1 Young Garbage Collections

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`gcId`	`int`	`jdk.jfr.Unsigned`
`type`	`java.lang.String`

jdk.G1HeapRegionInformation 🔗

G1 Heap Region Information

Information about a specific heap region in the G1 GC

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`index`	`int`	`jdk.jfr.Unsigned`
`type`	`java.lang.String`
`start`	`long`	`jdk.jfr.Unsigned`
`used`	`long`	`jdk.jfr.Unsigned`

jdk.G1HeapRegionTypeChange 🔗

G1 Heap Region Type Change

Information about a G1 heap region type change

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`index`	`int`	`jdk.jfr.Unsigned`
`from`	`java.lang.String`
`to`	`java.lang.String`
`start`	`long`	`jdk.jfr.Unsigned`
`used`	`long`	`jdk.jfr.Unsigned`

jdk.G1HeapSummary 🔗

G1 Heap Summary

jdk jdk since 11 Java Virtual Machine GC Heap

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`when`	`java.lang.String`
`edenUsedSize`	`long`	`jdk.jfr.Unsigned`
`edenTotalSize`	`long`	`jdk.jfr.Unsigned`
`survivorUsedSize`	`long`	`jdk.jfr.Unsigned`
`oldGenUsedSize`	`long`	`jdk.jfr.Unsigned`
`numberOfRegions`	`int`	`jdk.jfr.Unsigned`

jdk.G1MMU 🔗

G1 MMU Information

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`timeSlice`	`long`	`jdk.jfr.Timespan`	Time slice used to calculate MMU
`gcTime`	`long`	`jdk.jfr.Timespan`	Time stopped because of GC during last time slice
`pauseTarget`	`long`	`jdk.jfr.Timespan`	Max time allowed to be spent on GC during last time slice

jdk.GCCPUTime 🔗

GC CPU Time

GC CPU Time information. Supported: G1GC, ParallelGC and SerialGC

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`userTime`	`long`	`jdk.jfr.Unsigned`
`systemTime`	`long`	`jdk.jfr.Unsigned`
`realTime`	`long`	`jdk.jfr.Unsigned`

jdk.GCConfiguration 🔗

GC Configuration

The configuration of the garbage collector

jdk jdk since 11 Java Virtual Machine GC Configuration

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`youngCollector`	`java.lang.String`		The garbage collector used for the young generation
`oldCollector`	`java.lang.String`		The garbage collector used for the old generation
`parallelGCThreads`	`int`	`jdk.jfr.Unsigned`	Number of parallel threads to use for garbage collection
`concurrentGCThreads`	`int`	`jdk.jfr.Unsigned`	Number of concurrent threads to use for garbage collection
`usesDynamicGCThreads`	`boolean`		Whether a dynamic number of GC threads are used or not
`isExplicitGCConcurrent`	`boolean`		Whether System.gc() is concurrent or not
`isExplicitGCDisabled`	`boolean`		Whether System.gc() will cause a garbage collection or not
`pauseTarget`	`long`	`jdk.jfr.Timespan`	Target for GC pauses
`gcTimeRatio`	`int`	`jdk.jfr.Unsigned`	Target for runtime vs garbage collection time

jdk.GCHeapConfiguration 🔗

GC Heap Configuration

The configuration of the garbage collected heap

jdk jdk since 11 Java Virtual Machine GC Configuration

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`minSize`	`long`	`jdk.jfr.Unsigned`
`maxSize`	`long`	`jdk.jfr.Unsigned`
`initialSize`	`long`	`jdk.jfr.Unsigned`
`usesCompressedOops`	`boolean`		If compressed Oops (Ordinary Object Pointers) are enabled
`compressedOopsMode`	`java.lang.String`		The kind of compressed oops being used
`objectAlignment`	`long`	`jdk.jfr.Unsigned`	Object alignment (in bytes) on the heap
`heapAddressBits`	`byte`	`jdk.jfr.Unsigned`	Heap Address Size (in bits)

jdk.GCHeapMemoryPoolUsage 🔗

GC Heap Memory Pool Usage

jdk jdk since 21 Java Virtual Machine Heap

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`		GC Heap Memory Pool Name
`used`	`long`	`jdk.jfr.Unsigned`	Bytes used for storing objects in this memory pool
`committed`	`long`	`jdk.jfr.Unsigned`	Bytes committed for storing objects in this memory pool
`max`	`long`	`jdk.jfr.Unsigned`	Max size for storing objects in this memory pool

jdk.GCHeapMemoryUsage 🔗

GC Heap Memory Usage

jdk jdk since 21 Java Virtual Machine Heap

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`used`	`long`	`jdk.jfr.Unsigned`	Bytes allocated for storing objects on the heap
`committed`	`long`	`jdk.jfr.Unsigned`	Bytes committed for storing objects on the heap
`max`	`long`	`jdk.jfr.Unsigned`	Max size for the heap

jdk.GCHeapSummary 🔗

Heap Summary

jdk jdk since 11 Java Virtual Machine GC Heap

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`when`	`java.lang.String`
`heapSpace`	`jdk.types.VirtualSpace`
`heapUsed`	`long`	`jdk.jfr.Unsigned`	Bytes allocated by objects in the heap

jdk.GCPhaseConcurrent 🔗

GC Phase Concurrent

jdk jdk since 11 Java Virtual Machine GC Phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.GCPhaseConcurrentLevel1 🔗

GC Phase Concurrent Level 1

jdk jdk since 17 Java Virtual Machine GC Phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.GCPhaseConcurrentLevel2 🔗

GC Phase Concurrent Level 2

jdk jdk since 21 Java Virtual Machine GC Phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.GCPhaseParallel 🔗

GC Phase Parallel

GC phases for parallel workers

jdk jdk since 17 Java Virtual Machine GC Phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`gcWorkerId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.GCPhasePause 🔗

GC Phase Pause

jdk jdk since 11 Java Virtual Machine GC Phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.GCPhasePauseLevel1 🔗

GC Phase Pause Level 1

jdk jdk since 11 Java Virtual Machine GC Phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.GCPhasePauseLevel2 🔗

GC Phase Pause Level 2

jdk jdk since 11 Java Virtual Machine GC Phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.GCPhasePauseLevel3 🔗

GC Phase Pause Level 3

jdk jdk since 11 Java Virtual Machine GC Phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.GCPhasePauseLevel4 🔗

GC Phase Pause Level 4

jdk jdk since 11 Java Virtual Machine GC Phases

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.GCReferenceStatistics 🔗

GC Reference Statistics

Total count of processed references during GC

jdk jdk since 11 Java Virtual Machine GC Reference

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`type`	`java.lang.String`
`count`	`long`	`jdk.jfr.Unsigned`

jdk.GCSurvivorConfiguration 🔗

GC Survivor Configuration

The configuration of the survivors of garbage collection

jdk jdk since 11 Java Virtual Machine GC Configuration

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`maxTenuringThreshold`	`byte`	`jdk.jfr.Unsigned`	Upper limit for the age of how old objects to keep in the survivor area
`initialTenuringThreshold`	`byte`	`jdk.jfr.Unsigned`	Initial age limit for how old objects to keep in survivor area

jdk.GCTLABConfiguration 🔗

TLAB Configuration

The configuration of the Thread Local Allocation Buffers (TLABs)

jdk jdk since 11 Java Virtual Machine GC Configuration

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`usesTLABs`	`boolean`		If Thread Local Allocation Buffers (TLABs) are in use
`minTLABSize`	`long`	`jdk.jfr.Unsigned`
`tlabRefillWasteLimit`	`long`	`jdk.jfr.Unsigned`

jdk.GarbageCollection 🔗

Garbage Collection

Garbage collection performed by the JVM

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`		The name of the Garbage Collector
`cause`	`java.lang.String`		The reason for triggering this Garbage Collection
`sumOfPauses`	`long`	`jdk.jfr.Unsigned`	Sum of all the times in which Java execution was paused during the garbage collection
`longestPause`	`long`	`jdk.jfr.Unsigned`	Longest individual pause during the garbage collection

jdk.HeapDump 🔗

Heap Dump

Information about a successfully written Java heap dump

jdk jdk since 17 Java Virtual Machine Diagnostics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`destination`	`java.lang.String`
`size`	`long`
`gcBeforeDump`	`boolean`
`onOutOfMemoryError`	`boolean`
`overwrite`	`boolean`		Heap dump overwrites previous file location if it exists
`compression`	`int`		Compression level of the dump, if larger than 0 we use gzip compression with this level

jdk.InitialEnvironmentVariable 🔗

Initial Environment Variable

Key-value pairs for environment variables at JVM startup

jdk jdk since 11 Operating System

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`key`	`java.lang.String`
`value`	`java.lang.String`

jdk.InitialSecurityProperty 🔗

Initial Security Property

Initial Security Properties

jdk jdk since 17 Java Development Kit Security

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`key`	`java.lang.String`
`value`	`java.lang.String`

jdk.InitialSystemProperty 🔗

Initial System Property

System Property at JVM start

jdk jdk since 11 Java Virtual Machine

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`key`	`java.lang.String`
`value`	`java.lang.String`

jdk.IntFlag 🔗

Int Flag

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`value`	`int`
`origin`	`java.lang.String`

jdk.IntFlagChanged 🔗

Int Flag Changed

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`oldValue`	`int`
`newValue`	`int`
`origin`	`java.lang.String`

jdk.JITRestart 🔗

JIT Restart

Restart of the JIT compilers after they were stopped

jdk jdk since 17 Java Virtual Machine Compiler

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`freedMemory`	`long`	`jdk.jfr.Unsigned`
`codeCacheMaxCapacity`	`long`	`jdk.jfr.Unsigned`

jdk.JVMInformation 🔗

JVM Information

Description of JVM and the Java application

jdk jdk since 11 Java Virtual Machine

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`jvmName`	`java.lang.String`
`jvmVersion`	`java.lang.String`
`jvmArguments`	`java.lang.String`
`jvmFlags`	`java.lang.String`
`javaArguments`	`java.lang.String`
`jvmStartTime`	`long`	`jdk.jfr.Timestamp`
`pid`	`long`

jdk.JavaAgent 🔗

Java Agent

A Java programming language agent making use of the java.lang.instrument package for instrumenting programs running on the JVM

jdk jdk since 21 Java Virtual Machine Diagnostics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`options`	`java.lang.String`
`dynamic`	`boolean`		If the agent attached to the JVM dynamically during runtime, i.e. not at startup
`initializationTime`	`long`	`jdk.jfr.Unsigned`	The time the JVM initialized the agent
`initializationDuration`	`long`	`jdk.jfr.Unsigned`	The duration of executing the initialization method, either premain or agentmain

jdk.JavaErrorThrow 🔗

Java Error

An object derived from java.lang.Error has been created. OutOfMemoryErrors are ignored

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`message`	`java.lang.String`
`thrownClass`	`java.lang.Class`

jdk.JavaExceptionThrow 🔗

Java Exception

An object derived from java.lang.Exception has been created

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`message`	`java.lang.String`
`thrownClass`	`java.lang.Class`

jdk.JavaMonitorDeflate 🔗

Java Monitor Deflated

jdk jdk since 25 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`monitorClass`	`java.lang.Class`		Class of the object deflated. If null or N/A, the object has been garbage collected.
`address`	`long`	`jdk.jfr.Unsigned`	Address of the object deflated. If null or N/A, the object has been garbage collected.

jdk.JavaMonitorEnter 🔗

Java Monitor Blocked

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`monitorClass`	`java.lang.Class`
`previousOwner`	`java.lang.Thread`
`address`	`long`	`jdk.jfr.Unsigned`

jdk.JavaMonitorInflate 🔗

Java Monitor Inflated

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`monitorClass`	`java.lang.Class`
`address`	`long`	`jdk.jfr.Unsigned`
`cause`	`java.lang.String`		Cause of inflation

jdk.JavaMonitorNotify 🔗

Java Monitor Notify

Notifying a Java monitor

jdk jdk since 25 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`monitorClass`	`java.lang.Class`		Class of object waited on
`notifiedCount`	`int`	`jdk.jfr.Unsigned`	Number of actually notified threads
`address`	`long`	`jdk.jfr.Unsigned`	Address of object waited on

jdk.JavaMonitorStatistics 🔗

Java Monitor Statistics

jdk jdk since 25 Java Application Statistics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`count`	`long`	`jdk.jfr.Unsigned`	Current number of in-use monitors

jdk.JavaMonitorWait 🔗

Java Monitor Wait

Waiting on a Java monitor

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`monitorClass`	`java.lang.Class`		Class of object waited on
`notifier`	`java.lang.Thread`		Notifying Thread
`timeout`	`long`	`jdk.jfr.Timespan`	Maximum wait time
`timedOut`	`boolean`		Wait has been timed out
`address`	`long`	`jdk.jfr.Unsigned`	Address of object waited on

jdk.JavaThreadStatistics 🔗

Java Thread Statistics

jdk jdk since 11 Java Application Statistics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`activeCount`	`long`		Number of live active threads including both daemon and non-daemon threads
`daemonCount`	`long`		Number of live daemon threads
`accumulatedCount`	`long`		Number of threads created and also started since JVM start
`peakCount`	`long`		Peak live thread count since JVM start or when peak count was reset

jdk.LongFlag 🔗

Long Flag

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`value`	`long`
`origin`	`java.lang.String`

jdk.LongFlagChanged 🔗

Long Flag Changed

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`oldValue`	`long`
`newValue`	`long`
`origin`	`java.lang.String`

jdk.MetaspaceAllocationFailure 🔗

Metaspace Allocation Failure

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`classLoader`	`jdk.types.ClassLoader`
`hiddenClassLoader`	`boolean`
`size`	`long`	`jdk.jfr.Unsigned`
`metadataType`	`java.lang.String`
`metaspaceObjectType`	`java.lang.String`

jdk.MetaspaceChunkFreeListSummary 🔗

Metaspace Chunk Free List Summary

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`when`	`java.lang.String`
`metadataType`	`java.lang.String`
`specializedChunks`	`long`	`jdk.jfr.Unsigned`
`specializedChunksTotalSize`	`long`	`jdk.jfr.Unsigned`
`smallChunks`	`long`	`jdk.jfr.Unsigned`
`smallChunksTotalSize`	`long`	`jdk.jfr.Unsigned`
`mediumChunks`	`long`	`jdk.jfr.Unsigned`
`mediumChunksTotalSize`	`long`	`jdk.jfr.Unsigned`
`humongousChunks`	`long`	`jdk.jfr.Unsigned`
`humongousChunksTotalSize`	`long`	`jdk.jfr.Unsigned`

jdk.MetaspaceGCThreshold 🔗

Metaspace GC Threshold

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`oldValue`	`long`	`jdk.jfr.Unsigned`
`newValue`	`long`	`jdk.jfr.Unsigned`
`updater`	`java.lang.String`

jdk.MetaspaceOOM 🔗

Metaspace Out of Memory

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`classLoader`	`jdk.types.ClassLoader`
`hiddenClassLoader`	`boolean`
`size`	`long`	`jdk.jfr.Unsigned`
`metadataType`	`java.lang.String`
`metaspaceObjectType`	`java.lang.String`

jdk.MetaspaceSummary 🔗

Metaspace Summary

jdk jdk since 11 Java Virtual Machine GC Heap

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`when`	`java.lang.String`
`gcThreshold`	`long`	`jdk.jfr.Unsigned`
`metaspace`	`jdk.types.MetaspaceSizes`
`dataSpace`	`jdk.types.MetaspaceSizes`
`classSpace`	`jdk.types.MetaspaceSizes`

jdk.MethodTiming 🔗

Method Timing

Measures the approximate time it takes for a method to execute, including all delays, not just CPU processing time

jdk jdk since 25 Java Virtual Machine Method Tracing

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`method`	`jdk.types.Method`
`invocations`	`long`
`minimum`	`long`	`jdk.jfr.Timespan`	The value may be missing (Long.MIN_VALUE) if the clock-resolution is too low to establish a minimum time
`average`	`long`	`jdk.jfr.Timespan`	The value may be missing (Long.MIN_VALUE) if the clock-resolution is too low to establish an average time
`maximum`	`long`	`jdk.jfr.Timespan`	The value may be missing (Long.MIN_VALUE) if the clock-resolution is too low to establish a maximum time

jdk.MethodTrace 🔗

Method Trace

jdk jdk since 25 Java Virtual Machine Method Tracing

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`method`	`jdk.types.Method`

jdk.ModuleExport 🔗

Module Export

jdk jdk since 11 Java Virtual Machine Runtime Modules

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`exportedPackage`	`jdk.types.Package`
`targetModule`	`jdk.types.Module`		Module to which the package is qualifiedly exported. If null or N/A, the package is unqualifiedly exported

jdk.ModuleRequire 🔗

Module Require

A directed edge representing a dependency

jdk jdk since 11 Java Virtual Machine Runtime Modules

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`source`	`jdk.types.Module`
`requiredModule`	`jdk.types.Module`

jdk.NativeAgent 🔗

Native Agent

A native programming language agent making use of the JVMTI interface used by development, profiling and monitoring tools

jdk jdk since 21 Java Virtual Machine Diagnostics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`options`	`java.lang.String`
`dynamic`	`boolean`		If the library attached to the JVM dynamically during runtime, i.e. not at startup
`initializationTime`	`long`	`jdk.jfr.Unsigned`	The time the JVM initialized the agent
`initializationDuration`	`long`	`jdk.jfr.Unsigned`	The duration of executing the JVMTI VMInit event callback. If no VMInit callback is specified, the duration is 0. For a dynamically loaded agent, it is the duration of executing the call to Agent_OnAttach.
`path`	`java.lang.String`		The path of the library

jdk.NativeLibrary 🔗

Native Library

Information about a dynamic library or other native image loaded by the JVM process

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`baseAddress`	`long`	`jdk.jfr.Unsigned`	Starting address of the module
`topAddress`	`long`	`jdk.jfr.Unsigned`	Ending address of the module, if available

jdk.NativeLibraryLoad 🔗

Native Library Load

Information about a dynamic library or other native image load operation

jdk jdk since 22 Java Virtual Machine Runtime

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`name`	`java.lang.String`
`success`	`boolean`		Success or failure of the load operation
`errorMessage`	`java.lang.String`		In case of a load error, error description
`fpuCorrectionAttempt`	`boolean`		In case of IEEE conformance issues we might reset the FP environment
`fpuCorrectionSuccess`	`boolean`		Stores the result in the case of an FP environment correction

jdk.NativeLibraryUnload 🔗

Native Library Unload

Information about a dynamic library or other native image unload operation

jdk jdk since 22 Java Virtual Machine Runtime

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`name`	`java.lang.String`
`success`	`boolean`		Success or failure of the unload operation
`errorMessage`	`java.lang.String`		In case of an unload error, error description

jdk.NativeMemoryUsage 🔗

Native Memory Usage Per Type

Native memory usage for a given memory tag in the JVM

jdk jdk since 20 Java Virtual Machine Memory

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`type`	`java.lang.String`		Type used for the native memory allocation
`reserved`	`long`	`jdk.jfr.Unsigned`	Reserved bytes for this type
`committed`	`long`	`jdk.jfr.Unsigned`	Committed bytes for this type

jdk.NativeMemoryUsageTotal 🔗

Total Native Memory Usage

Total native memory usage for the JVM. Might not be the exact sum of the NativeMemoryUsage events due to timeing.

jdk jdk since 20 Java Virtual Machine Memory

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`reserved`	`long`	`jdk.jfr.Unsigned`	Total amount of reserved bytes for the JVM
`committed`	`long`	`jdk.jfr.Unsigned`	Total amount of committed bytes for the JVM

jdk.NativeMethodSample 🔗

Native Sample

Snapshot of a thread in native code, executing or waiting. Threads that are executing Java code are not included.

jdk jdk since 11 Java Virtual Machine Profiling

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`sampledThread`	`java.lang.Thread`
`stackTrace`	`jdk.types.StackTrace`
`state`	`java.lang.String`

jdk.NetworkUtilization 🔗

Network Utilization

jdk jdk since 11 Operating System Network

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`networkInterface`	`java.lang.String`		Network Interface Name
`readRate`	`long`	`jdk.jfr.DataAmount`	Number of incoming bits per second
`writeRate`	`long`	`jdk.jfr.DataAmount`	Number of outgoing bits per second

jdk.OSInformation 🔗

OS Information

Description of the OS the JVM runs on, for example, a uname-like output

jdk jdk since 11 Operating System

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`osVersion`	`java.lang.String`

jdk.ObjectAllocationInNewTLAB 🔗

Allocation in new TLAB

Allocation in new Thread Local Allocation Buffer

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`objectClass`	`java.lang.Class`		Class of allocated object
`allocationSize`	`long`	`jdk.jfr.Unsigned`
`tlabSize`	`long`	`jdk.jfr.Unsigned`

jdk.ObjectAllocationOutsideTLAB 🔗

Allocation outside TLAB

Allocation outside Thread Local Allocation Buffers

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`objectClass`	`java.lang.Class`		Class of allocated object
`allocationSize`	`long`	`jdk.jfr.Unsigned`

jdk.ObjectAllocationSample 🔗

Object Allocation Sample

jdk jdk since 17 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`objectClass`	`java.lang.Class`		Class of allocated object
`weight`	`long`	`jdk.jfr.DataAmount`	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

jdk.ObjectCount 🔗

Object Count

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`objectClass`	`java.lang.Class`
`count`	`long`
`totalSize`	`long`	`jdk.jfr.Unsigned`

jdk.ObjectCountAfterGC 🔗

Object Count after GC

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`objectClass`	`java.lang.Class`
`count`	`long`
`totalSize`	`long`	`jdk.jfr.Unsigned`

jdk.OldGarbageCollection 🔗

Old Garbage Collection

Extra information specific to Old Garbage Collections

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`gcId`	`int`	`jdk.jfr.Unsigned`

jdk.OldObjectSample 🔗

Old Object Sample

A potential memory leak

jdk jdk since 11 Java Virtual Machine Profiling

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`allocationTime`	`long`	`jdk.jfr.Unsigned`
`objectSize`	`long`	`jdk.jfr.Unsigned`
`objectAge`	`long`	`jdk.jfr.Unsigned`
`lastKnownHeapUsage`	`long`	`jdk.jfr.Unsigned`
`object`	`jdk.types.OldObject`
`arrayElements`	`int`		If the object is an array, the number of elements, or minimum value for the type int if it is not an array
`root`	`jdk.types.OldObjectGcRoot`

jdk.PSHeapSummary 🔗

Parallel Scavenge Heap Summary

jdk jdk since 11 Java Virtual Machine GC Heap

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`when`	`java.lang.String`
`oldSpace`	`jdk.types.VirtualSpace`
`oldObjectSpace`	`jdk.types.ObjectSpace`
`youngSpace`	`jdk.types.VirtualSpace`
`edenSpace`	`jdk.types.ObjectSpace`
`fromSpace`	`jdk.types.ObjectSpace`
`toSpace`	`jdk.types.ObjectSpace`

jdk.ParallelOldGarbageCollection 🔗

Parallel Old Garbage Collection

Extra information specific to Parallel Old Garbage Collections

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`gcId`	`int`	`jdk.jfr.Unsigned`
`densePrefix`	`long`	`jdk.jfr.Unsigned`	The address of the dense prefix, used when compacting

jdk.PhysicalMemory 🔗

Physical Memory

OS Physical Memory

jdk jdk since 11 Operating System Memory

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`totalSize`	`long`	`jdk.jfr.Unsigned`	Total amount of physical memory available to OS
`usedSize`	`long`	`jdk.jfr.Unsigned`	Total amount of physical memory in use

jdk.ProcessStart 🔗

Process Start

Operating system process started

jdk jdk since 17 Operating System

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`pid`	`long`
`directory`	`java.lang.String`
`command`	`java.lang.String`

jdk.PromoteObjectInNewPLAB 🔗

Promotion in new PLAB

Object survived scavenge and was copied to a new Promotion Local Allocation Buffer (PLAB). Supported GCs are Parallel Scavenge, 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.

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`	Identifier signifying GC during which the object was promoted
`objectClass`	`java.lang.Class`		Class of promoted object
`objectSize`	`long`	`jdk.jfr.Unsigned`	Size of promoted object
`tenuringAge`	`int`	`jdk.jfr.Unsigned`	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 scavenge the object survives. Newly allocated objects have tenuring age 0.
`tenured`	`boolean`		True if object was promoted to Old space, otherwise the object was aged and copied to a Survivor space
`plabSize`	`long`	`jdk.jfr.Unsigned`	Size of the allocated PLAB to which the object was copied

jdk.PromoteObjectOutsidePLAB 🔗

Promotion outside PLAB

Object survived scavenge and was copied directly to the heap. Supported GCs are Parallel Scavenge, 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.

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`	Identifier signifying GC during which the object was promoted
`objectClass`	`java.lang.Class`		Class of promoted object
`objectSize`	`long`	`jdk.jfr.Unsigned`	Size of promoted object
`tenuringAge`	`int`	`jdk.jfr.Unsigned`	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 scavenge the object survives. Newly allocated objects have tenuring age 0.
`tenured`	`boolean`		True if object was promoted to Old space, otherwise the object was aged and copied to a Survivor space

jdk.PromotionFailed 🔗

Promotion Failed

Promotion of an object failed

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`promotionFailed`	`jdk.types.CopyFailed`
`thread`	`java.lang.Thread`

jdk.RedefineClasses 🔗

Redefine Classes

jdk jdk since 17 Java Virtual Machine Class Loading

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`classCount`	`int`
`redefinitionId`	`long`	`jdk.jfr.Unsigned`

jdk.ReservedStackActivation 🔗

Reserved Stack Activation

Activation of Reserved Stack Area caused by stack overflow with ReservedStackAccess annotated method in call stack

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`method`	`jdk.types.Method`

jdk.ResidentSetSize 🔗

Resident Set Size

Resident set size of the process

jdk jdk since 21 Java Virtual Machine Memory

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`size`	`long`	`jdk.jfr.Unsigned`	Resident set size of the process
`peak`	`long`	`jdk.jfr.Unsigned`	Resident set size peak value of the process

jdk.RetransformClasses 🔗

Retransform Classes

jdk jdk since 17 Java Virtual Machine Class Loading

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`classCount`	`int`
`redefinitionId`	`long`	`jdk.jfr.Unsigned`

jdk.SafepointBegin 🔗

Safepoint Begin

Safepointing begin

jdk jdk since 11 Java Virtual Machine Runtime Safepoint

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`safepointId`	`long`	`jdk.jfr.Unsigned`
`totalThreadCount`	`int`		The total number of threads at the start of safe point
`jniCriticalThreadCount`	`int`		The number of threads in JNI critical sections

jdk.SafepointEnd 🔗

Safepoint End

Safepointing end

jdk jdk since 11 Java Virtual Machine Runtime Safepoint

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`safepointId`	`long`	`jdk.jfr.Unsigned`

jdk.SafepointLatency 🔗

Safepoint Latency

The delay for a thread to reach its next safepoint poll instruction after receiving an asynchronous sampling interrupt

jdk jdk since 25 Java Virtual Machine Runtime Safepoint

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`threadState`	`java.lang.String`

jdk.SafepointStateSynchronization 🔗

Safepoint State Synchronization

Synchronize run state of threads

jdk jdk since 11 Java Virtual Machine Runtime Safepoint

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`safepointId`	`long`	`jdk.jfr.Unsigned`
`initialThreadCount`	`int`		The number of threads running at the beginning of state check
`runningThreadCount`	`int`		The number of threads still running
`iterations`	`int`		Number of state check iterations

jdk.SecurityPropertyModification 🔗

Security Property Modification

Modification of Security property

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`key`	`java.lang.String`
`value`	`java.lang.String`

jdk.SecurityProviderService 🔗

Security Provider Instance Request

Details of Provider.getInstance(String type, String algorithm) calls

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`type`	`java.lang.String`
`algorithm`	`java.lang.String`
`provider`	`java.lang.String`

jdk.SerializationMisdeclaration 🔗

Serialization Misdeclaration

Methods and fields misdeclarations. The checks are usually performed just once per serializable class, the first time it is used by serialization. Under high memory pressure, a class might be re-checked again.

jdk jdk since 23 Java Development Kit Serialization

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`misdeclaredClass`	`java.lang.Class`
`message`	`java.lang.String`

jdk.ShenandoahEvacuationInformation 🔗

Shenandoah Evacuation Information

jdk jdk since 24 Java Virtual Machine GC Detailed

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`cSetRegions`	`long`	`jdk.jfr.Unsigned`
`cSetUsedBefore`	`long`	`jdk.jfr.Unsigned`	Memory usage before GC in the collection set regions
`cSetUsedAfter`	`long`	`jdk.jfr.Unsigned`	Memory usage after GC in the collection set regions
`collectedOld`	`long`	`jdk.jfr.Unsigned`	Memory collected from old generation
`collectedPromoted`	`long`	`jdk.jfr.Unsigned`	Memory collected from generation promotion
`collectedYoung`	`long`	`jdk.jfr.Unsigned`	Memory collected from young generation
`regionsPromotedHumongous`	`long`	`jdk.jfr.Unsigned`
`regionsPromotedRegular`	`long`	`jdk.jfr.Unsigned`
`regularPromotedGarbage`	`long`	`jdk.jfr.Unsigned`	Garbage memory of in place promoted regular regions
`regularPromotedFree`	`long`	`jdk.jfr.Unsigned`	Free memory of in place promoted regular regions
`freeRegions`	`long`	`jdk.jfr.Unsigned`	Free regions prior to collection
`regionsImmediate`	`long`	`jdk.jfr.Unsigned`
`immediateBytes`	`long`	`jdk.jfr.Unsigned`

jdk.ShenandoahHeapRegionInformation 🔗

Shenandoah Heap Region Information

Information about a specific heap region in the Shenandoah GC

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`index`	`int`	`jdk.jfr.Unsigned`
`state`	`java.lang.String`
`start`	`long`	`jdk.jfr.Unsigned`
`used`	`long`	`jdk.jfr.Unsigned`

jdk.ShenandoahHeapRegionStateChange 🔗

Shenandoah Heap Region State Change

Information about a Shenandoah heap region state change

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`index`	`int`	`jdk.jfr.Unsigned`
`from`	`java.lang.String`
`to`	`java.lang.String`
`start`	`long`	`jdk.jfr.Unsigned`
`used`	`long`	`jdk.jfr.Unsigned`

jdk.Shutdown 🔗

JVM Shutdown

JVM shutting down

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`reason`	`java.lang.String`		Reason for JVM shutdown

jdk.SocketRead 🔗

Socket Read

Reading data from a socket

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`host`	`java.lang.String`
`address`	`java.lang.String`
`port`	`int`
`timeout`	`long`	`jdk.jfr.Timespan`
`bytesRead`	`long`	`jdk.jfr.DataAmount`	Number of bytes read from the socket
`endOfStream`	`boolean`		If end of stream was reached

jdk.SocketWrite 🔗

Socket Write

Writing data to a socket

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`host`	`java.lang.String`
`address`	`java.lang.String`
`port`	`int`
`bytesWritten`	`long`	`jdk.jfr.DataAmount`	Number of bytes written to the socket

jdk.StringFlag 🔗

String Flag

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`value`	`java.lang.String`
`origin`	`java.lang.String`

jdk.StringFlagChanged 🔗

String Flag Changed

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`oldValue`	`java.lang.String`
`newValue`	`java.lang.String`
`origin`	`java.lang.String`

jdk.StringTableStatistics 🔗

String Table Statistics

jdk jdk since 17 Java Virtual Machine Runtime Tables

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`bucketCount`	`long`	`jdk.jfr.Unsigned`	Number of buckets
`entryCount`	`long`	`jdk.jfr.Unsigned`	Number of all entries
`totalFootprint`	`long`	`jdk.jfr.Unsigned`	Total memory footprint (the table itself plus all of the entries)
`bucketCountMaximum`	`long`	`jdk.jfr.Unsigned`	The maximum bucket length (entries in a single bucket)
`bucketCountAverage`	`float`		The average bucket length
`bucketCountVariance`	`float`		How far bucket lengths are spread out from their average value
`bucketCountStandardDeviation`	`float`		How far bucket lengths are spread out from their mean (expected) value
`insertionRate`	`float`		How many items were added since last event (per second)
`removalRate`	`float`		How many items were removed since last event (per second)

jdk.SwapSpace 🔗

Swap Space

OS Swap Space

jdk jdk since 23 Operating System Memory

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`totalSize`	`long`	`jdk.jfr.DataAmount`	Total swap space available to the OS
`freeSize`	`long`	`jdk.jfr.DataAmount`	Free swap space

jdk.SymbolTableStatistics 🔗

Symbol Table Statistics

jdk jdk since 17 Java Virtual Machine Runtime Tables

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`bucketCount`	`long`	`jdk.jfr.Unsigned`	Number of buckets
`entryCount`	`long`	`jdk.jfr.Unsigned`	Number of all entries
`totalFootprint`	`long`	`jdk.jfr.Unsigned`	Total memory footprint (the table itself plus all of the entries)
`bucketCountMaximum`	`long`	`jdk.jfr.Unsigned`	The maximum bucket length (entries in a single bucket)
`bucketCountAverage`	`float`		The average bucket length
`bucketCountVariance`	`float`		How far bucket lengths are spread out from their average value
`bucketCountStandardDeviation`	`float`		How far bucket lengths are spread out from their mean (expected) value
`insertionRate`	`float`		How many items were added since last event (per second)
`removalRate`	`float`		How many items were removed since last event (per second)

jdk.SyncOnValueBasedClass 🔗

Value Based Class Synchronization

jdk jdk since 17 Java Virtual Machine Diagnostics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`valueBasedClass`	`java.lang.Class`

jdk.SystemGC 🔗

System GC

jdk jdk since 17 Java Virtual Machine GC Collector

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`invokedConcurrent`	`boolean`

jdk.SystemProcess 🔗

System Process

jdk jdk since 11 Operating System

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`pid`	`java.lang.String`
`commandLine`	`java.lang.String`

jdk.TLSHandshake 🔗

TLS Handshake

Parameters used in TLS Handshake

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`peerHost`	`java.lang.String`
`peerPort`	`int`
`protocolVersion`	`java.lang.String`
`cipherSuite`	`java.lang.String`
`certificateId`	`long`	`jdk.jfr.Unsigned`	Peer Certificate Id

jdk.TenuringDistribution 🔗

Tenuring Distribution

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`gcId`	`int`	`jdk.jfr.Unsigned`
`age`	`int`	`jdk.jfr.Unsigned`
`size`	`long`	`jdk.jfr.Unsigned`

jdk.ThreadAllocationStatistics 🔗

Thread Allocation Statistics

jdk jdk since 11 Java Application Statistics

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`allocated`	`long`	`jdk.jfr.Unsigned`	Approximate number of bytes allocated since thread start
`thread`	`java.lang.Thread`

jdk.ThreadCPULoad 🔗

Thread CPU Load

jdk jdk since 11 Operating System Processor

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`user`	`float`	`jdk.jfr.Percentage`	User mode thread CPU load
`system`	`float`	`jdk.jfr.Percentage`	System mode thread CPU load

jdk.ThreadContextSwitchRate 🔗

Thread Context Switch Rate

jdk jdk since 11 Operating System Processor

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`switchRate`	`float`	`jdk.jfr.Frequency`	Number of context switches per second

jdk.ThreadDump 🔗

Thread Dump

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`result`	`java.lang.String`

jdk.ThreadEnd 🔗

Java Thread End

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`thread`	`java.lang.Thread`

jdk.ThreadPark 🔗

Java Thread Park

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`parkedClass`	`java.lang.Class`
`timeout`	`long`	`jdk.jfr.Timespan`
`until`	`long`	`jdk.jfr.Timestamp`
`address`	`long`	`jdk.jfr.Unsigned`

jdk.ThreadSleep 🔗

Java Thread Sleep

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`time`	`long`	`jdk.jfr.Timespan`

jdk.ThreadStart 🔗

Java Thread Start

jdk jdk since 11 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`thread`	`java.lang.Thread`
`parentThread`	`java.lang.Thread`

jdk.UnsignedIntFlag 🔗

Unsigned Int Flag

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`value`	`int`	`jdk.jfr.Unsigned`
`origin`	`java.lang.String`

jdk.UnsignedIntFlagChanged 🔗

Unsigned Int Flag Changed

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`oldValue`	`int`	`jdk.jfr.Unsigned`
`newValue`	`int`	`jdk.jfr.Unsigned`
`origin`	`java.lang.String`

jdk.UnsignedLongFlag 🔗

Unsigned Long Flag

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`value`	`long`	`jdk.jfr.Unsigned`
`origin`	`java.lang.String`

jdk.UnsignedLongFlagChanged 🔗

Unsigned Long Flag Changed

jdk jdk since 11 Java Virtual Machine Flag

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`
`oldValue`	`long`	`jdk.jfr.Unsigned`
`newValue`	`long`	`jdk.jfr.Unsigned`
`origin`	`java.lang.String`

jdk.VirtualThreadEnd 🔗

Virtual Thread End

jdk jdk since 19 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`javaThreadId`	`long`

jdk.VirtualThreadPinned 🔗

Virtual Thread Pinned

jdk jdk since 19 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`blockingOperation`	`java.lang.String`
`pinnedReason`	`java.lang.String`
`carrierThread`	`java.lang.Thread`

jdk.VirtualThreadStart 🔗

Virtual Thread Start

jdk jdk since 19 Java Application

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`javaThreadId`	`long`

jdk.VirtualThreadSubmitFailed 🔗

Virtual Thread Submit Failed

Submit of task for virtual thread failed

jdk jdk since 19 Java Development Kit Threading

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`javaThreadId`	`long`
`exceptionMessage`	`java.lang.String`

jdk.VirtualizationInformation 🔗

Virtualization Information

Description of the virtualization technology the JVM runs on

jdk jdk since 11 Operating System

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`name`	`java.lang.String`

jdk.X509Certificate 🔗

X509 Certificate

Details of X.509 Certificate parsed by JDK

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`algorithm`	`java.lang.String`
`serialNumber`	`java.lang.String`
`subject`	`java.lang.String`
`issuer`	`java.lang.String`
`keyType`	`java.lang.String`
`keyLength`	`int`
`certificateId`	`long`	`jdk.jfr.Unsigned`
`validFrom`	`long`	`jdk.jfr.Timestamp`
`validUntil`	`long`	`jdk.jfr.Timestamp`

jdk.X509Validation 🔗

X509 Validation

Serial numbers from X.509 Certificates forming chain of trust

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`certificateId`	`long`	`jdk.jfr.Unsigned`
`certificatePosition`	`int`		Certificate position in chain of trust, 1 = trust anchor
`validationCounter`	`long`

jdk.YoungGarbageCollection 🔗

Young Garbage Collection

Extra information specific to Young Garbage Collections

Name	Type	Content Type
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`gcId`	`int`	`jdk.jfr.Unsigned`
`tenuringThreshold`	`int`	`jdk.jfr.Unsigned`

jdk.YoungGenerationConfiguration 🔗

Young Generation Configuration

The configuration of the young generation of the garbage collected heap

jdk jdk since 11 Java Virtual Machine GC Configuration

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`minSize`	`long`	`jdk.jfr.Unsigned`
`maxSize`	`long`	`jdk.jfr.Unsigned`
`newRatio`	`int`	`jdk.jfr.Unsigned`	The size of the young generation relative to the tenured generation

jdk.ZAllocationStall 🔗

ZGC Allocation Stall

Time spent waiting for memory to become available

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`type`	`java.lang.String`
`size`	`long`	`jdk.jfr.Unsigned`

jdk.ZOldGarbageCollection 🔗

ZGC Old Garbage Collection

Extra information specific to ZGC Old Garbage Collections

jdk jdk since 21 Java Virtual Machine GC Collector

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`

jdk.ZPageAllocation 🔗

ZGC Page Allocation

Allocation of a ZPage

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`stackTrace`	`jdk.types.StackTrace`		Stack Trace starting from the method the event was committed in
`type`	`java.lang.String`
`size`	`long`	`jdk.jfr.Unsigned`
`harvested`	`long`	`jdk.jfr.Unsigned`
`committed`	`long`	`jdk.jfr.Unsigned`
`harvestedRanges`	`int`	`jdk.jfr.Unsigned`	Number of harvested memory ranges
`multiPartition`	`boolean`
`successful`	`boolean`
`nonBlocking`	`boolean`

jdk.ZRelocationSet 🔗

ZGC Relocation Set

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`total`	`long`	`jdk.jfr.Unsigned`
`empty`	`long`	`jdk.jfr.Unsigned`
`relocate`	`long`	`jdk.jfr.Unsigned`

jdk.ZRelocationSetGroup 🔗

ZGC Relocation Set Group

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`type`	`java.lang.String`
`candidatePages`	`long`	`jdk.jfr.Unsigned`
`total`	`long`	`jdk.jfr.Unsigned`
`empty`	`long`	`jdk.jfr.Unsigned`
`selectedPages`	`long`	`jdk.jfr.Unsigned`
`relocate`	`long`	`jdk.jfr.Unsigned`

jdk.ZStatisticsCounter 🔗

ZGC Statistics Counter

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`id`	`java.lang.String`
`increment`	`long`	`jdk.jfr.Unsigned`
`value`	`long`	`jdk.jfr.Unsigned`

jdk.ZStatisticsSampler 🔗

ZGC Statistics Sampler

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`id`	`java.lang.String`
`value`	`long`	`jdk.jfr.Unsigned`

jdk.ZThreadPhase 🔗

ZGC Thread Phase

Name	Type	Content Type	Description
`startTime`	`long`	`jdk.jfr.Timestamp`
`duration`	`long`	`jdk.jfr.Timespan`
`eventThread`	`java.lang.Thread`		Thread in which event was committed in
`gcId`	`int`	`jdk.jfr.Unsigned`
`name`	`java.lang.String`

jdk.ZUncommit 🔗

ZGC Uncommit

Uncommitting of memory