Release Notes
Announcements
Security Announcements
Title | Metric | Unit | Description |
Network connections | tcp | - | Number of TCP server connections |
| http | - | Number of HTTP server connections |
ZooKeeper event subscriptions | watches | - | Number of ZooKeeper event subscriptions |
Ephemeral nodes held in ZooKeeper | ephemeralNode | - | Number of ephemeral nodes held in ZooKeeper |
Active tasks in BackgroundPool | backgroundPoolTask | - | Number of active tasks in BackgroundProcessingPool |
| backgroundSchedulePoolTask | - | Number of active tasks in BackgroundSchedulePool |
Threads waiting for locks in Context | contextLockWait | - | Number of threads waiting for locks in Context |
Throttled INSERT queries | delayedInserts | - | Number of throttled INSERT queries |
Requests in fly to data sources of dictionaries of cache type | dictCacheRequests | - | Number of requests in fly to data sources of dictionaries of cache type |
Pending files to process for asynchronous insertion into distributed tables | distributedSend | - | Number of pending files to process for asynchronous insertion into distributed tables |
Threads | global | - | Number of threads in the global thread pool |
| globalActive | - | Number of active threads in the global thread pool |
| local | - | Number of threads in the local thread pool |
| localActive | - | Number of active threads in the local thread pool |
Replicas participating in leader election | leaderElection | - | Number of replicas participating in leader election |
Replicated tables | leaderReplica | - | Number of replicated tables that are leaders |
| readonlyReplica | - | Number of replicated tables in read-only status |
Total allocated memory size | memoryTracking | GB | Total memory size allocated to queries being executed |
| backgroundProcessingPool | GB | Total memory size allocated to the background processing pool |
| backgroundSchedulePool | GB | Total memory size allocated to the background scheduling pool |
| memoryTrackingForMerges | GB | Total memory size allocated to background merges |
Merges being executed in the background | merge | - | Number of merges being executed in the background |
Opened files | read | - | Number of opened readable files |
| write | - | Number of opened writable files |
Table changes | partMutation | - | Number of table changes |
Query processing threads | queryThread | - | Number of query processing threads |
Stopped or waiting queries | queryPreempted | - | Number of stopped or waiting queries |
System calls | read | - | Number of read system calls |
| write | - | Number of write system calls |
Blocks | fetch | - | Number of blocks collected from replicas |
| send | - | Number of blocks sent to replicas |
| check | - | Number of blocks for consistency check |
Server change | revision | - | Number of server changes |
Version number | version | 1 | Version number |
Threads waiting for read/write locks | waitingRead | - | Number of threads waiting for read/write locks to read from tables |
| waitingWrite | - | Number of threads waiting for read/write locks to write to tables |
| activeRead | - | Number of threads holding read locks on tables |
| activeWrite | - | Number of threads holding write locks on tables |
Rows in buffer tables | storageBufferRows | - | Number of rows in buffer tables |
Bytes in buffer tables | storageBufferBytes | MB | Number of bytes in buffer tables |
Title | Metric | Unit | Description |
Queries | total | - | Total number of queries that may be executed |
| select | - | Number of SELECT queries that may be executed |
| insert | - | Number of INSERT queries that may be executed |
Inserted rows | insertedRows | - | Number of rows inserted into all tables |
Inserted bytes | insertedBytes | - | Number of bytes inserted into all tables |
Total time waiting for system calls | read | μs | Total time waiting for read system calls |
| write | μs | Total time waiting for write system calls |
Opened files | fileOpen | - | Number of opened files |
Reads/Writes from/to file descriptors | read | - | Number of reads from file descriptors |
| write | - | Number of writes to file descriptors |
Bytes read/written from/to file descriptors | read | MB | Number of bytes read from file descriptors |
| write | MB | Number of bytes written to file descriptors |
Total time processing threads | realtime | μs | Total time processing threads |
| user | μs | Total time processing threads executing CPU instructions in user space |
| system | μs | Total time processing threads executing CPU instructions in OS kernel space |
Compiled regular expressions | regexpCreated | - | Number of compiled regular expressions |
Title | Metric | Unit | Description |
Size of cache of marks of StorageMergeTree | markCacheBytes | MB | Size of cache of marks of StorageMergeTree |
Cache files of marks of StorageMergeTree | markCacheFiles | - | Number of cache files of marks of StorageMergeTree |
Maximum number of active blocks | maxPartCountForPartition | - | Number of largest active data blocks in partition |
Databases | databaseCount | - | Number of databases |
Data tables | tableCount | - | Number of data tables |
Maximum replica latency | absolute | μs | Maximum replica queue latency |
| relative | μs | Maximum difference of the absolute latency from other blocks |
Size of the queue for the operations to be performed | replicasMaxQueueSize | - | Size of the queue for the operations to be performed |
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