This page contains all Performance Analyzer metrics. All metrics support the `avg`, `sum`, `min`, and `max` aggregations, although certain metrics measure only one thing, making the choice of aggregation irrelevant.
For information on dimensions, see the [dimensions reference](#dimensions-reference).
This list is extensive. We recommend using Ctrl/Cmd + F to find what you're looking for.
<td>CPU usage ratio. CPU time (in milliseconds) used by the associated thread(s) in the past five seconds, divided by 5000 milliseconds.
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<td>Paging_MajfltRate
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<td>The number of major faults per second in the past five seconds. A major fault requires the process to load a memory page from disk.
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<td>Paging_MinfltRate
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<td>The number of minor faults per second in the past five seconds. A minor fault does not requires the process to load a memory page from disk.
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<td>Paging_RSS
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<td>The number of pages the process has in real memory---the pages that count towards text, data, or stack space. This number does not include pages that have not been demand-loaded in or swapped out.
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<td>Sched_Runtime
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<td>Time (seconds) spent executing on the CPU per context switch.
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<td>Sched_Waittime
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<td>Time (seconds) spent waiting on a run queue per context switch.
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<td>Sched_CtxRate
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<td>Number of times run on the CPU per second in the past five seconds.
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<td>Heap_AllocRate
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<td>An approximation of the heap memory allocated, in bytes, per second in the past five seconds
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<td>IO_ReadThroughput
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<td>Number of bytes read per second in the last five seconds.
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<td>IO_WriteThroughput
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<td>Number of bytes written per second in the last five seconds.
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<td>IO_TotThroughput
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<td>Number of bytes read or written per second in the last five seconds.
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<td>IO_ReadSyscallRate
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<td>Read system calls per second in the last five seconds.
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<td>IO_WriteSyscallRate
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<td>Write system calls per second in the last five seconds.
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<td>IO_TotalSyscallRate
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<td>Read and write system calls per second in the last five seconds.
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<td>Thread_Blocked_Time
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<td>Average time (seconds) that the associated thread(s) blocked to enter or reenter a monitor.
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<td>Thread_Blocked_Event
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<td>The total number of times that the associated thread(s) blocked to enter or reenter a monitor (i.e. the number of times a thread has been in the blocked state).
<td>Average time (seconds) that the associated thread(s) waited to enter or reenter a monitor in WAITING or TIMED_WAITING state.
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<td>Thread_Waited_Event
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<td>The total number of times that the associated thread(s) waited to enter or reenter a monitor (i.e. the number of times a thread has been in the WAITING or TIMED_WAITING state).
<td>The total number of events executed on a shard in the past five seconds.
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<td>ShardBulkDocs
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<td>The total number of documents indexed in the past five seconds.
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<td>Indexing_ThrottleTime
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<tdrowspan="30">ShardID, IndexName
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<td>Time (milliseconds) that the index has been under merge throttling control in the past five seconds.
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<td>Cache_Query_Hit
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<td>The number of successful lookups in the query cache in the past five seconds.
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<td>Cache_Query_Miss
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<td>The number of lookups in the query cache that failed to retrieve a `DocIdSet` in the past five seconds. `DocIdSet` is a set of document IDs in Lucene.
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<td>Cache_Query_Size
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<td>Query cache memory size in bytes.
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<td>Cache_FieldData_Eviction
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<td>The number of times OpenSearch has evicted data from the fielddata heap space (occurs when the heap space is full) in the past five seconds.
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<td>Cache_FieldData_Size
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<td>Fielddata memory size in bytes.
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<td>Cache_Request_Hit
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<td>The number of successful lookups in the shard request cache in the past five seconds.
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<td>Cache_Request_Miss
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<td>The number of lookups in the request cache that failed to retrieve the results of search requests in the past five seconds.
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<td>Cache_Request_Eviction
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<td>The number of times OpenSearch evicts data from shard request cache (occurs when the request cache is full) in the past five seconds.
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<td>Cache_Request_Size
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<td>Shard request cache memory size in bytes.
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<td>Refresh_Event
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<td>The total number of refreshes executed in the past five seconds.
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<td>Refresh_Time
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<td>The total time (milliseconds) spent executing refreshes in the past five seconds
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<td>Flush_Event
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<td>The total number of flushes executed in the past five seconds.
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<td>Flush_Time
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<td>The total time (milliseconds) spent executing flushes in the past five seconds.
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<td>Merge_Event
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<td>The total number of merges executed in the past five seconds.
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<td>Merge_Time
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<td>The total time (milliseconds) spent executing merges in the past five seconds.
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<td>Merge_CurrentEvent
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<td>The current number of merges executing.
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<td>Indexing_Buffer
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<td>Index buffer memory size in bytes.
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<td>Segments_Total
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<td>The number of segments.
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<td>IndexWriter_Memory
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<td>Estimated memory usage by the index writer in bytes.
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<td>Bitset_Memory
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<td>Estimated memory usage for the cached bit sets in bytes.
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<td>VersionMap_Memory
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<td>Estimated memory usage of the version map in bytes.
<td>Total heap size (in bytes) that is available for utilization by a shard of an index in a particular indexing stage (Coordinating, Primary or Replica).
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<td>Indexing_Pressure_Current_Bytes
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<td>Total heap size (in bytes) occupied by a shard of an index in a particular indexing stage (Coordinating, Primary or Replica).
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<td>Indexing_Pressure_Last_Successful_Timestamp
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<td>Timestamp of a request that was successful for a shard of an index in a particular indexing stage (Coordinating, Primary or Replica).
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<td>Indexing_Pressure_Rejection_Count
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<td>Total rejections performed by OpenSearch for a shard of an index in a particular indexing stage (Coordinating, Primary or Replica).
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<td>Indexing_Pressure_Average_Window_Throughput
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<td>Average throughput of the last n requests (The value of n is determined by `shard_indexing_pressure.secondary_parameter.throughput.request_size_window` setting) for a shard of an index in a particular indexing stage (Coordinating, Primary or Replica).
<td>The number of garbage collections that have occurred in the past five seconds.
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<td>GC_Collection_Time
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<td>The approximate accumulated time (milliseconds) of all garbage collections that have occurred in the past five seconds.
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<td>Heap_Committed
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<td>The amount of memory (bytes) that is committed for the JVM to use.
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<td>Heap_Init
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<td>The amount of memory (bytes) that the JVM initially requests from the operating system for memory management.
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<td>Heap_Max
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<td>The maximum amount of memory (bytes) that can be used for memory management.
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<td>Heap_Used
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<td>The amount of used memory in bytes.
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<td>Disk_Utilization
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<tdrowspan="3">DiskName
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<td>Disk utilization rate: percentage of disk time spent reading and writing by the OpenSearch process in the past five seconds.
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<td>Disk_WaitTime
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<td>Average duration (milliseconds) of read and write operations in the past five seconds.
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<td>Disk_ServiceRate
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<td>Service rate: MB read or written per second in the past five seconds. This metric assumes that each disk sector stores 512 bytes.
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<td>Net_TCP_NumFlows
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<tdrowspan="6">DestAddr
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<td>Number of samples collected. Performance Analyzer collects one sample every five seconds.
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<td>Net_TCP_TxQ
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<td>Average number of TCP packets in the send buffer.
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<td>Net_TCP_RxQ
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<td>Average number of TCP packets in the receive buffer.
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<td>Net_TCP_Lost
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<td>Average number of unrecovered recurring timeouts. This number is reset when the recovery finishes or `SND.UNA` is advanced. `SND.UNA` is the sequence number of the first byte of data that has been sent, but not yet acknowledged.
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<td>Net_TCP_SendCWND
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<td>Average size (bytes) of the sending congestion window.
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<td>Net_TCP_SSThresh
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<td>Average size (bytes) of the slow start size threshold.
<td>The current number of pending tasks in the cluster state update thread. Each node has a cluster state update thread that submits cluster state update tasks (create index, update mapping, allocate shard, fail shard, etc.).
MasterTaskInsertOrder | The order in which the task was inserted (e.g. `3691`).
MasterTaskPriority | Priority of the task (e.g. `URGENT`). OpenSearch executes higher priority tasks before lower priority ones, regardless of `insert_order`.
