system.metrics

### SendScalars[​](#sendscalars "Direct link to SendScalars")

Number of connections that are sending data for scalars to remote servers.

### SerializationCacheBytesInMemory[​](#serializationcachebytesinmemory "Direct link to SerializationCacheBytesInMemory")

Total size of the serialization cache in bytes including only the values

### SerializationCacheBytesInMemoryAllocated[​](#serializationcachebytesinmemoryallocated "Direct link to SerializationCacheBytesInMemoryAllocated")

Total size of the serialization cache in bytes including keys and overhead from empty slots

### SerializationCacheCount[​](#serializationcachecount "Direct link to SerializationCacheCount")

Total number of entries in the serialization cache

### SharedCatalogDropDetachLocalTablesErrors[​](#sharedcatalogdropdetachlocaltableserrors "Direct link to SharedCatalogDropDetachLocalTablesErrors")

Number of errors that occurred when attempting to drop or detach local tables in Shared Catalog.

### SharedCatalogDropLocalThreads[​](#sharedcatalogdroplocalthreads "Direct link to SharedCatalogDropLocalThreads")

Number of threads in the threadpool for drop of local tables in Shared Catalog.

### SharedCatalogDropLocalThreadsActive[​](#sharedcatalogdroplocalthreadsactive "Direct link to SharedCatalogDropLocalThreadsActive")

Number of active threads in the threadpool for drop of local tables in Shared Catalog.

### SharedCatalogDropLocalThreadsScheduled[​](#sharedcatalogdroplocalthreadsscheduled "Direct link to SharedCatalogDropLocalThreadsScheduled")

Number of queued or active jobs in the threadpool for drop of local tables in Shared Catalog.

### SharedCatalogDropZooKeeperThreads[​](#sharedcatalogdropzookeeperthreads "Direct link to SharedCatalogDropZooKeeperThreads")

Number of threads in the threadpool for drop of object in ZooKeeper in Shared Catalog.

### SharedCatalogDropZooKeeperThreadsActive[​](#sharedcatalogdropzookeeperthreadsactive "Direct link to SharedCatalogDropZooKeeperThreadsActive")

Number of active threads in the threadpool for drop of object in ZooKeeper in Shared Catalog.

### SharedCatalogDropZooKeeperThreadsScheduled[​](#sharedcatalogdropzookeeperthreadsscheduled "Direct link to SharedCatalogDropZooKeeperThreadsScheduled")

Number of queued or active jobs in the threadpool for drop of object in ZooKeeper in Shared Catalog.

### SharedCatalogNumberOfObjectsInState[​](#sharedcatalognumberofobjectsinstate "Direct link to SharedCatalogNumberOfObjectsInState")

Number of objects in the current state of Shared Catalog.

### SharedCatalogStateApplicationThreads[​](#sharedcatalogstateapplicationthreads "Direct link to SharedCatalogStateApplicationThreads")

Number of threads in the threadpool for state application in Shared Catalog.

### SharedCatalogStateApplicationThreadsActive[​](#sharedcatalogstateapplicationthreadsactive "Direct link to SharedCatalogStateApplicationThreadsActive")

Number of active threads in the threadpool for state application in Shared Catalog.

### SharedCatalogStateApplicationThreadsScheduled[​](#sharedcatalogstateapplicationthreadsscheduled "Direct link to SharedCatalogStateApplicationThreadsScheduled")

Number of queued or active jobs in the threadpool for state application in Shared Catalog.

### SharedDatabaseCatalogTablesInLocalDropDetachQueue[​](#shareddatabasecatalogtablesinlocaldropdetachqueue "Direct link to SharedDatabaseCatalogTablesInLocalDropDetachQueue")

Number of tables in the queue for local drop or detach in Shared Catalog.

### SharedMergeTreeAssignedCurrentParts[​](#sharedmergetreeassignedcurrentparts "Direct link to SharedMergeTreeAssignedCurrentParts")

Number of parts locked by merge or mutation

### SharedMergeTreeBrokenCondemnedPartsInKeeper[​](#sharedmergetreebrokencondemnedpartsinkeeper "Direct link to SharedMergeTreeBrokenCondemnedPartsInKeeper")

How many broken condemned part records stored in keeper

### SharedMergeTreeCondemnedPartsInKeeper[​](#sharedmergetreecondemnedpartsinkeeper "Direct link to SharedMergeTreeCondemnedPartsInKeeper")

How many condemned part records stored in keeper

### SharedMergeTreeFetch[​](#sharedmergetreefetch "Direct link to SharedMergeTreeFetch")

Number of fetches in progress

### SharedMergeTreeMaxActiveReplicas[​](#sharedmergetreemaxactivereplicas "Direct link to SharedMergeTreeMaxActiveReplicas")

The maximum number of active replicas registered in Keeper

### SharedMergeTreeMaxInactiveReplicas[​](#sharedmergetreemaxinactivereplicas "Direct link to SharedMergeTreeMaxInactiveReplicas")

The maximum number of inactive replicas registered in Keeper

### SharedMergeTreeMaxPartitions[​](#sharedmergetreemaxpartitions "Direct link to SharedMergeTreeMaxPartitions")

The maximum number of partitions registered in Keeper across all SharedMergeTree tables

### SharedMergeTreeMaxReplicas[​](#sharedmergetreemaxreplicas "Direct link to SharedMergeTreeMaxReplicas")

The maximum number of replicas registered in Keeper across all tables. Note it might not be a sum of SharedMergeTreeMaxActiveReplicas and SharedMergeTreeMaxInactiveReplicas

### SharedMergeTreeMinActiveReplicas[​](#sharedmergetreeminactivereplicas "Direct link to SharedMergeTreeMinActiveReplicas")

The minimum number of active replicas registered in Keeper

### SharedMergeTreeMinInactiveReplicas[​](#sharedmergetreemininactivereplicas "Direct link to SharedMergeTreeMinInactiveReplicas")

The minimum number of inactive replicas registered in Keeper

### SharedMergeTreeMinPartitions[​](#sharedmergetreeminpartitions "Direct link to SharedMergeTreeMinPartitions")

The minimum number of partitions registered in Keeper across all SharedMergeTree tables

### SharedMergeTreeMinReplicas[​](#sharedmergetreeminreplicas "Direct link to SharedMergeTreeMinReplicas")

The minimum number of replicas registered in Keeper across all tables. Note it might not be a sum of SharedMergeTreeMinActiveReplicas and SharedMergeTreeMinInactiveReplicas

### SharedMergeTreeOutdatedPartsInKeeper[​](#sharedmergetreeoutdatedpartsinkeeper "Direct link to SharedMergeTreeOutdatedPartsInKeeper")

How many outdated part records stored in keeper

### SharedMergeTreeThreads[​](#sharedmergetreethreads "Direct link to SharedMergeTreeThreads")

Number of threads in the thread pools in internals of SharedMergeTree

### SharedMergeTreeThreadsActive[​](#sharedmergetreethreadsactive "Direct link to SharedMergeTreeThreadsActive")

Number of threads in the thread pools in internals of SharedMergeTree running a task

### SharedMergeTreeThreadsScheduled[​](#sharedmergetreethreadsscheduled "Direct link to SharedMergeTreeThreadsScheduled")

Number of queued or active threads in the thread pools in internals of SharedMergeTree

### StartupScriptsExecutionState[​](#startupscriptsexecutionstate "Direct link to StartupScriptsExecutionState")

State of startup scripts execution: 0 = not finished, 1 = success, 2 = failure.

### StartupSystemTablesThreads[​](#startupsystemtablesthreads "Direct link to StartupSystemTablesThreads")

Number of threads in the StartupSystemTables thread pool.

### StartupSystemTablesThreadsActive[​](#startupsystemtablesthreadsactive "Direct link to StartupSystemTablesThreadsActive")

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

### StartupSystemTablesThreadsScheduled[​](#startupsystemtablesthreadsscheduled "Direct link to StartupSystemTablesThreadsScheduled")

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

### StatelessWorkerThreads[​](#statelessworkerthreads "Direct link to StatelessWorkerThreads")

Number of threads in the stateless worker thread pool.

### StatelessWorkerThreadsActive[​](#statelessworkerthreadsactive "Direct link to StatelessWorkerThreadsActive")

Number of threads in the stateless worker thread pool running a task.

### StatelessWorkerThreadsScheduled[​](#statelessworkerthreadsscheduled "Direct link to StatelessWorkerThreadsScheduled")

Number of queued or active jobs in the stateless worker thread pool.

### StorageBufferBytes[​](#storagebufferbytes "Direct link to StorageBufferBytes")

Number of bytes in buffers of Buffer tables