system.metrics

### DistributedInsertThreadsScheduled[​](#distributedinsertthreadsscheduled "Direct link to DistributedInsertThreadsScheduled")

Number of queued or active jobs used for INSERT into Distributed.

### DistributedSend[​](#distributedsend "Direct link to DistributedSend")

Number of connections to remote servers sending data that was INSERTed into Distributed tables. Both synchronous and asynchronous mode.

### DropDistributedCacheThreads[​](#dropdistributedcachethreads "Direct link to DropDistributedCacheThreads")

Number of threads in the threadpool for drop distributed cache query.

### DropDistributedCacheThreadsActive[​](#dropdistributedcachethreadsactive "Direct link to DropDistributedCacheThreadsActive")

Number of active threads in the threadpool for drop distributed cache query.

### DropDistributedCacheThreadsScheduled[​](#dropdistributedcachethreadsscheduled "Direct link to DropDistributedCacheThreadsScheduled")

Number of queued or active jobs in the threadpool for drop distributed cache.

### EphemeralNode[​](#ephemeralnode "Direct link to EphemeralNode")

Number of ephemeral nodes hold in ZooKeeper.

### FilesystemCacheDelayedCleanupElements[​](#filesystemcachedelayedcleanupelements "Direct link to FilesystemCacheDelayedCleanupElements")

Filesystem cache elements in background cleanup queue

### FilesystemCacheDownloadQueueElements[​](#filesystemcachedownloadqueueelements "Direct link to FilesystemCacheDownloadQueueElements")

Filesystem cache elements in download queue

### FilesystemCacheElements[​](#filesystemcacheelements "Direct link to FilesystemCacheElements")

Filesystem cache elements (file segments)

### FilesystemCacheHoldFileSegments[​](#filesystemcacheholdfilesegments "Direct link to FilesystemCacheHoldFileSegments")

Filesystem cache file segment which are currently hold as unreleasable

### FilesystemCacheKeys[​](#filesystemcachekeys "Direct link to FilesystemCacheKeys")

Number of keys in filesystem cache

### FilesystemCacheReadBuffers[​](#filesystemcachereadbuffers "Direct link to FilesystemCacheReadBuffers")

Number of active cache buffers

### FilesystemCacheReserveThreads[​](#filesystemcachereservethreads "Direct link to FilesystemCacheReserveThreads")

Threads number trying to reserve space in cache

### FilesystemCacheSize[​](#filesystemcachesize "Direct link to FilesystemCacheSize")

Filesystem cache size in bytes

### FilesystemCacheSizeLimit[​](#filesystemcachesizelimit "Direct link to FilesystemCacheSizeLimit")

Filesystem cache size limit in bytes

### FilteringMarksWithPrimaryKey[​](#filteringmarkswithprimarykey "Direct link to FilteringMarksWithPrimaryKey")

Number of threads currently doing filtering of mark ranges by the primary key

### FilteringMarksWithSecondaryKeys[​](#filteringmarkswithsecondarykeys "Direct link to FilteringMarksWithSecondaryKeys")

Number of threads currently doing filtering of mark ranges by secondary keys

### FormatParsingThreads[​](#formatparsingthreads "Direct link to FormatParsingThreads")

Number of threads in the thread pool used for parsing input.

### FormatParsingThreadsActive[​](#formatparsingthreadsactive "Direct link to FormatParsingThreadsActive")

Number of threads in the thread pool used for parsing input running a task.

### FormatParsingThreadsScheduled[​](#formatparsingthreadsscheduled "Direct link to FormatParsingThreadsScheduled")

Number of queued or active jobs in the thread pool used for parsing input.

### FreezePartThreads[​](#freezepartthreads "Direct link to FreezePartThreads")

Number of threads in the threadpool for freezing data parts.

### FreezePartThreadsActive[​](#freezepartthreadsactive "Direct link to FreezePartThreadsActive")

Number of active threads in the threadpool for freezing data parts.

### FreezePartThreadsScheduled[​](#freezepartthreadsscheduled "Direct link to FreezePartThreadsScheduled")

Number of queued or active jobs in the threadpool for freezing data parts.

### GlobalThread[​](#globalthread "Direct link to GlobalThread")

Number of threads in global thread pool.

### GlobalThreadActive[​](#globalthreadactive "Direct link to GlobalThreadActive")

Number of threads in global thread pool running a task.

### GlobalThreadScheduled[​](#globalthreadscheduled "Direct link to GlobalThreadScheduled")

Number of queued or active jobs in global thread pool.

### HTTPConnection[​](#httpconnection "Direct link to HTTPConnection")

Number of connections to HTTP server

### HTTPConnectionsStored[​](#httpconnectionsstored "Direct link to HTTPConnectionsStored")

Total count of sessions stored in the session pool for http hosts

### HTTPConnectionsTotal[​](#httpconnectionstotal "Direct link to HTTPConnectionsTotal")

Total count of all sessions: stored in the pool and actively used right now for http hosts

### HashedDictionaryThreads[​](#hasheddictionarythreads "Direct link to HashedDictionaryThreads")

Number of threads in the HashedDictionary thread pool.

### HashedDictionaryThreadsActive[​](#hasheddictionarythreadsactive "Direct link to HashedDictionaryThreadsActive")

Number of threads in the HashedDictionary thread pool running a task.

### HashedDictionaryThreadsScheduled[​](#hasheddictionarythreadsscheduled "Direct link to HashedDictionaryThreadsScheduled")

Number of queued or active jobs in the HashedDictionary thread pool.

### HiveFilesCacheBytes[​](#hivefilescachebytes "Direct link to HiveFilesCacheBytes")

Size of the hive cache in bytes

### HiveFilesCacheFiles[​](#hivefilescachefiles "Direct link to HiveFilesCacheFiles")

Number of cached files in the hive cache

### HiveMetadataFilesCacheBytes[​](#hivemetadatafilescachebytes "Direct link to HiveMetadataFilesCacheBytes")

Size of the hive metadata cache in bytes

### HiveMetadataFilesCacheFiles[​](#hivemetadatafilescachefiles "Direct link to HiveMetadataFilesCacheFiles")

Number of cached files in the hive metadata cache

### IDiskCopierThreads[​](#idiskcopierthreads "Direct link to IDiskCopierThreads")

Number of threads for copying data between disks of different types.

### IDiskCopierThreadsActive[​](#idiskcopierthreadsactive "Direct link to IDiskCopierThreadsActive")

Number of threads for copying data between disks of different types running a task.

### IDiskCopierThreadsScheduled[​](#idiskcopierthreadsscheduled "Direct link to IDiskCopierThreadsScheduled")

Number of queued or active jobs for copying data between disks of different types.

### IOPrefetchThreads[​](#ioprefetchthreads "Direct link to IOPrefetchThreads")

Number of threads in the IO prefetch thread pool.

### IOPrefetchThreadsActive[​](#ioprefetchthreadsactive "Direct link to IOPrefetchThreadsActive")

Number of threads in the IO prefetch thread pool running a task.

### IOPrefetchThreadsScheduled[​](#ioprefetchthreadsscheduled "Direct link to IOPrefetchThreadsScheduled")

Number of queued or active jobs in the IO prefetch thread pool.

### IOThreads[​](#iothreads "Direct link to IOThreads")

Number of threads in the IO thread pool.

### IOThreadsActive[​](#iothreadsactive "Direct link to IOThreadsActive")

Number of threads in the IO thread pool running a task.

### IOThreadsScheduled[​](#iothreadsscheduled "Direct link to IOThreadsScheduled")

Number of queued or active jobs in the IO thread pool.

### IOUringInFlightEvents[​](#iouringinflightevents "Direct link to IOUringInFlightEvents")

Number of io\_uring SQEs in flight

### IOUringPendingEvents[​](#iouringpendingevents "Direct link to IOUringPendingEvents")

Number of io\_uring SQEs waiting to be submitted

### IOWriterThreads[​](#iowriterthreads "Direct link to IOWriterThreads")

Number of threads in the IO writer thread pool.

### IOWriterThreadsActive[​](#iowriterthreadsactive "Direct link to IOWriterThreadsActive")

Number of threads in the IO writer thread pool running a task.

### IOWriterThreadsScheduled[​](#iowriterthreadsscheduled "Direct link to IOWriterThreadsScheduled")

Number of queued or active jobs in the IO writer thread pool.

### IcebergCatalogThreads[​](#icebergcatalogthreads "Direct link to IcebergCatalogThreads")

Number of threads in the IcebergCatalog thread pool.