--- title: Data Service Metrics description: A list of the metrics provided by the Data Service. pubDate: 2026-08-18T04:50:45.818Z antora: editUrl: https://github.com/couchbase/docs-capella/edit/main/modules/metrics-reference/pages/data-service-metrics.adoc xref: xref:cloud:metrics-reference:data-service-metrics.adoc[] --- [Consult the llms.txt file for a full list of contents](/llms.txt) [View original HTML](/cloud/metrics-reference/data-service-metrics.html) # Data Service Metrics > A list of the metrics provided by the Data Service. > [!TIP] > * The x.y.z badge shows the Couchbase Server version the metric was added in. > * The type / unit badge shows shows the Prometheus [type](https://prometheus.io/docs/tutorials/understanding%5Fmetric%5Ftypes/) and [unit](https://prometheus.io/docs/practices/naming/#base-units) (if present). `kv_audit_dropped_events` 7.0.0 counter The number of audit events dropped due to errors while trying to insert them to the audit trail `kv_audit_enabled` 7.0.0 gauge Boolean value to indicate if audit is enabled or not `kv_auth_cmds` 7.0.0 gauge The number of authentication commands `kv_auth_errors` 7.0.0 gauge The number of failed authentication requests `kv_auth_external_authentication_duration_seconds` 8.0.0 histogram / seconds Timing histogram for external authentication execution times `kv_auth_external_authorization_duration_seconds` 8.0.0 histogram / seconds Timing histogram for external authorization execution times `kv_auth_external_received` 8.0.0 gauge The number of received external authentication responses `kv_auth_external_sent` 8.0.0 gauge The total number of requests sent to the external authentication provider `kv_bg_batch_size` 7.0.0 histogram Batch size for background fetches `kv_bg_load_seconds` 7.0.0 histogram / seconds Background fetches waiting for disk `kv_bg_wait_seconds` 7.0.0 histogram / seconds Background fetches waiting in the dispatcher queue `kv_clients` 7.6.0 gauge The number of references to the bucket `kv_cmd_duration_seconds` 7.0.0 histogram / seconds Per-opcode histogram of time taken to execute operations `kv_cmd_lookup` 7.0.0 counter The number of lookup operations. This includes operations such as Get, Gat, Getk, Getq, GetLocked, GetRandomKey, GetReplica, SubdocMultiLookup, SubdocGet and SubdocExists `kv_cmd_lookup_10s_count` 7.0.0 gauge The number of lookup operations performed within the last 10 seconds. This aggregates operations like Get, Gat, Getk, Getq, and various Sub-Document lookups `kv_cmd_lookup_10s_duration_seconds` 7.0.0 gauge / seconds The total duration of lookup operations performed over the last 10 seconds. This aggregates the time for operations like Get, Gat, Getk, Getq, and various Sub-Document lookups `kv_cmd_mutation` 7.0.0 counter The number of mutation operations. This includes operations such as Add, Append, Decrement, Delete, Gat, Increment, Prepend, Replace, Set, Touch, and various Sub-Document mutations (e.g., SubdocArrayAddUnique, SubdocCounter, SubdocDelete, etc.) `kv_cmd_mutation_10s_count` 7.0.0 gauge The number of mutation operations performed within the last 10 seconds. This includes operations like Add, Append, Delete, Replace, and various Sub-Document mutations `kv_cmd_mutation_10s_duration_seconds` 7.0.0 gauge / seconds The total duration of mutation operations performed over the last 10 seconds. This includes time spent on operations like Add, Append, Delete, Replace, and various Sub-Document mutations `kv_collection_data_size_bytes` 7.0.0 gauge / bytes Per-collection data size on disk for active vbuckets only `kv_collection_history` 7.2.0 gauge Whether history (CDC) is enabled for each collection `kv_collection_item_count` 7.0.0 gauge Per-collection item count for active vbuckets only `kv_collection_maxTTL_seconds` 7.0.0 gauge / seconds Per-collection maxTTL (maximum expiry) if configured `kv_collection_mem_used_bytes` 7.0.0 gauge / bytes Per-collection memory usage for active vbuckets only `kv_collection_ops` 7.0.0 counter Per-collection counters of operations that perform store/get(read)/delete type operations against active vbuckets `kv_conflicts_resolved` 7.2.0 counter Counter of all SetWithMeta/DelWithMeta conflict resolution results. The result may be that the incoming operation was: accepted as it is 'ahead', rejected as it is 'behind', or rejected as it appears identical (by metadata, not comparing document bodies) `kv_conn_timeslice_yields` 7.6.0 counter The total number all clients in this bucket yield due to using their entire timeslice `kv_conn_yields` 7.0.0 counter The total number all clients in this bucket yield due to consuming the number of ops allowed for the current timeslice `kv_connection_structures` 7.0.0 gauge Current number of allocated connection structures `kv_curr_connections` 7.0.0 gauge The current number of connections. This includes user, system and daemon connections `kv_curr_connections_closing` 8.0.0 gauge The current number of connections currently closing down `kv_curr_items` 7.0.0 gauge Count of alive (non-deleted) items in active vbuckets, including non-resident items `kv_curr_items_tot` 7.0.0 gauge Total number of items `kv_curr_temp_items` 7.0.0 gauge Number of temporary items in memory `kv_current_external_client_connections` 7.6.5 gauge The current number of authenticated connections using the labelled SDK `kv_daemon_connections` 7.0.0 gauge The number of server sockets currently in use `kv_daemon_memory_allocated_bytes` 7.1.0 gauge / bytes Total amount of memory allocated (outside the context of a bucket) `kv_daemon_memory_resident_bytes` 7.1.0 gauge / bytes Total amount of memory resident (outside the context of a bucket) `kv_datatype_count` 7.0.2 gauge Count of items in memory with a given datatype combination `kv_dcp_backoff` 7.0.0 gauge Number of times Consumer DCP connections (i.e., replica) have paused consuming items because memory usage is too high `kv_dcp_connection_count` 7.0.0 gauge Current number of DCP connections (Consumers or Producers) `kv_dcp_count` 7.0.0 gauge Current number of DCP connections `kv_dcp_items_backfilled` 7.2.1 gauge Number of items pushed into the DCP stream ready queue from a backfill `kv_dcp_items_remaining` 7.0.0 gauge Current total number of items remaining for to be sent for all outgoing DCP streams (approximate) `kv_dcp_items_sent` 7.0.0 gauge Total number of items sent out by all _currently existing_ outgoing DCP streams, since each stream was created `kv_dcp_max_running_backfills` 7.0.2 gauge Maximum number of backfills across all DCP connections `kv_dcp_num_running_backfills` 7.0.2 gauge Total number of running backfills across all DCP connections `kv_dcp_paused_count` 7.6.0 gauge Count of how many times the DCP connection has been paused `kv_dcp_ready_queue_size_bytes` 7.1.0 gauge / bytes Estimated memory usage of items waiting to be sent across all _existing_ DCP connections `kv_dcp_stream_count` 7.6.0 gauge Current number of Streams (Active or Passive) `kv_dcp_total_data_size_bytes` 7.0.0 gauge / bytes Total data sent across all _existing_ DCP connections `kv_dcp_total_uncompressed_data_size_bytes` 7.0.0 gauge / bytes Total equivalent uncompressed size of data sent across all _existing_ DCP connections `kv_dcp_unpaused_count` 7.6.0 gauge Count of how many times the DCP connection has been unpaused `kv_disk_seconds` 7.0.0 histogram / seconds time spent waiting for disk `kv_domain_memory_used_bytes` 7.1.0 gauge / bytes Current memory used in KV for primary/secondary domain `kv_ep_access_scanner_enabled` 7.0.0 gauge True if access scanner task is enabled `kv_ep_access_scanner_last_runtime_seconds` 7.0.0 gauge / seconds Number of seconds that last Access Scanner task run took to complete. `kv_ep_access_scanner_num_items` 7.0.0 gauge Number of items that last Access Scanner task run wrote to the Access Log. `kv_ep_ahead_exceptions` 7.0.0 counter Total number of times a vbucket saw an item with a HLC CAS from too far in the future (indicating the clock is behind) `kv_ep_allow_sanitize_value_in_deletion` 7.0.0 gauge Let EPE delete/prepare/del\_with\_meta prune any invalid body in the payload instead of failing `kv_ep_alog_block_size` 7.0.0 gauge Logging block size. `kv_ep_alog_max_stored_items` 7.0.0 gauge The maximum number of items the Access Scanner will hold in memory before commiting them to disk `kv_ep_alog_resident_ratio_threshold` 7.0.0 gauge Resident ratio percentage above which we do not generate access log `kv_ep_alog_sleep_time` 7.0.0 gauge Number of minutes between each sweep for the access log `kv_ep_alog_task_time` 7.0.0 gauge Hour in GMT time when access scanner task is scheduled to run `kv_ep_arena_memory_allocated_bytes` 7.6.0 gauge / bytes The total memory allocated from the engine's arena `kv_ep_arena_memory_resident_bytes` 7.6.0 gauge / bytes The resident set size of the engine's arena `kv_ep_backfill_mem_threshold` 7.0.0 gauge Memory usage threshold (percentage of bucket quota) after which backfill will be snoozed. `kv_ep_behind_exceptions` 7.0.0 counter Total number of times a vbucket saw an item with a HLC CAS from too far in the past (indicating the clock is ahead) `kv_ep_bfilter_enabled` 7.0.0 gauge Enable or disable the bloom filter `kv_ep_bfilter_fp_prob` 7.0.0 gauge Bloomfilter: Allowed probability for false positives `kv_ep_bfilter_key_count` 7.0.0 gauge Bloomfilter: Estimated key count per vbucket `kv_ep_bfilter_residency_threshold` 7.0.0 gauge If resident ratio (during full eviction) were found less than this threshold, compaction will include all items into bloomfilter `kv_ep_bg_fetch_avg_read_amplification_ratio` 7.0.0 gauge / ratio Average read amplification for all background fetch operations - ratio of read()s to documents fetched. `kv_ep_bg_fetched` 7.0.0 counter Number of items fetched from disk `kv_ep_bg_fetched_compaction` 7.1.5 counter The number of bgfetches which are triggered by compaction `kv_ep_bg_load_avg_seconds` 7.0.0 gauge / seconds The average time for an item to be loaded from disk `kv_ep_bg_load_seconds` 7.0.0 counter / seconds The total elapsed time for items to be loaded from disk `kv_ep_bg_max_load_seconds` 7.0.0 gauge / seconds The longest load time when loading from disk `kv_ep_bg_max_wait_seconds` 7.0.0 gauge / seconds The longest time in the queue waiting to be loaded from disk `kv_ep_bg_meta_fetched` 7.0.0 counter Number of metadata fetches from disk `kv_ep_bg_min_load_seconds` 7.0.0 gauge / seconds The shortest load time when loading from disk `kv_ep_bg_min_wait_seconds` 7.0.0 gauge / seconds The shortest time in the queue waiting to be loaded from disk `kv_ep_bg_num_samples` 7.0.0 gauge The number of samples included in the average `kv_ep_bg_remaining_items` 7.0.0 gauge Number of remaining bg fetch items `kv_ep_bg_remaining_jobs` 7.0.0 gauge Number of remaining bg fetch jobs `kv_ep_bg_wait_avg_seconds` 7.0.0 gauge / seconds The average wait time for an item before it's serviced by the dispatcher `kv_ep_bg_wait_seconds` 7.0.0 gauge / seconds The total elapse time for the wait queue `kv_ep_blob_num` 7.0.0 gauge The number of blob objects in the cache `kv_ep_blob_num_allocated_total` 7.6.0 counter The number of blob object allocations `kv_ep_blob_num_freed_total` 7.6.0 counter The number of blob object deallocations `kv_ep_bucket_quota_change_task_poll_interval` 7.0.0 gauge Time in seconds between the BucketQuotaChangeTask polling memory usage to attempt to reduce the bucket quota `kv_ep_cache_size` 7.0.0 gauge Memory quota (in bytes) for this bucket. `kv_ep_checkpoint_computed_max_size_bytes` 7.1.0 gauge / bytes Actual max size in bytes of a single Checkpoint `kv_ep_checkpoint_consumer_limit_bytes` 7.6.2 gauge / bytes Max allocation allowed in all checkpoints (including the dcp consumer buffer quota) `kv_ep_checkpoint_destruction_tasks` 7.0.0 gauge Number of tasks responsible for destroying closed unreferenced checkpoints. `kv_ep_checkpoint_max_size` 7.0.0 gauge Max size (in bytes) of a single checkpoint. '0' for EPEngine auto-setup. `kv_ep_checkpoint_memory_bytes` 7.0.0 gauge / bytes Memory of items in all checkpoints `kv_ep_checkpoint_memory_pending_destruction_bytes` 7.1.0 gauge / bytes Memory of checkpoint structures awaiting destruction by a background task `kv_ep_checkpoint_memory_quota_bytes` 7.1.0 gauge / bytes Max allocation allowed in all checkpoints `kv_ep_checkpoint_memory_ratio` 7.0.0 gauge Max ratio of the bucket quota that can be allocated in checkpoints. The system enters a TempOOM phase if hit. `kv_ep_checkpoint_memory_recovery_lower_mark` 7.0.0 gauge Fraction of the checkpoint quota (as computed by checkpoint\_memory\_ratio) that represents the target of checkpoint memory recovery. Memory recovery yields when reached. `kv_ep_checkpoint_memory_recovery_lower_mark_bytes` 7.1.0 gauge Fraction of the checkpoint quota (as computed by checkpoint\_memory\_ratio) that represents the target of checkpoint memory recovery. Memory recovery yields when reached `kv_ep_checkpoint_memory_recovery_upper_mark` 7.0.0 gauge Fraction of the checkpoint quota (as computed by checkpoint\_memory\_ratio) that triggers attempt of memory releasing from checkpoint. `kv_ep_checkpoint_memory_recovery_upper_mark_bytes` 7.1.0 gauge Fraction of the checkpoint quota (as computed by checkpoint\_memory\_ratio) that triggers attempt of memory releasing from checkpoint `kv_ep_checkpoint_remover_task_count` 7.0.0 gauge Number of concurrent tasks performing ItemExpel and CursorDrop/CheckpointRemoval `kv_ep_chk_expel_enabled` 7.0.0 gauge Enable the ability to expel (remove from memory) items from a checkpoint. An item can be expelled if all cursors in the checkpoint have iterated past the item. `kv_ep_chk_persistence_remains` 7.0.0 gauge Number of remaining vbuckets for checkpoint persistence `kv_ep_clock_cas_drift_threshold_exceeded` 7.0.0 gauge ep\_active\_ahead\_exceptions + ep\_replica\_ahead\_exceptions `kv_ep_collections_drop_compaction_delay` 7.0.0 gauge How many milliseconds before compaction runs following the drop of a collection `kv_ep_collections_enabled` 7.0.0 gauge Enable the collections functionality, enabling the storage of collection metadata `kv_ep_commit_num` 7.0.0 gauge Total number of write commits `kv_ep_commit_time_seconds` 7.0.0 gauge / seconds Number of milliseconds of most recent commit `kv_ep_commit_time_total_seconds` 7.0.0 gauge / seconds Cumulative milliseconds spent committing `kv_ep_compaction_aborted` 7.1.0 gauge Counter of how many times compaction aborted, e.g. the vbucket is required to rollback, so compaction is aborted `kv_ep_compaction_expire_from_start` 7.0.0 gauge Should compaction expire items that were logically deleted at the start of the compaction (true) or at the point in time at which they were visited (false)? `kv_ep_compaction_expiry_fetch_inline` 7.0.0 gauge If compaction requires a bgfetch before attempting expiry to ensure it does not expire an older version of the document, true: fetch it in the compaction thread. false: queue a bgfetch for the bgfetcher task to complete `kv_ep_compaction_failed` 7.1.0 gauge Counter of how many times compaction has failed, e.g. a system call error caused compaction to fail `kv_ep_compaction_max_concurrent_ratio` 7.0.0 gauge Maximum number of CompactVBucketTask tasks which can run concurrently, as a fraction of the possible Writer task concurrency. Note that a minimum of 1, and a maximum of N-1 CompactVBucketTasks will be run (where N is the possible Writer task concurrency), to ensure both forward progress for Compaction and Flushing. `kv_ep_concurrent_pagers` 7.0.0 gauge Number of eviction pager tasks to create when memory usage is high `kv_ep_connection_cleanup_interval` 7.0.0 gauge How often connection manager task should release dead connections (in seconds). `kv_ep_connection_manager_interval` 7.0.0 gauge How often connection manager task should be run (in seconds). `kv_ep_continuous_backup_callback_count` 8.0.0 gauge Number of times the continuous backup metadata callback was run. `kv_ep_continuous_backup_callback_time_seconds` 8.0.0 gauge / seconds Time spent in KV in the continuous backup metadata callback. `kv_ep_continuous_backup_enabled` 7.0.0 gauge True if continouous backup is enabled. `kv_ep_continuous_backup_interval` 7.0.0 gauge The continouous backup interval (in seconds). `kv_ep_couchstore_file_cache_max_size` 7.0.0 gauge Maximum number of couchstore files that we will keep open. Default value is 30 \* 1024 (i.e. one file for each vBucket and 30 Buckets - the supported limit). `kv_ep_couchstore_midpoint_rollback_optimisation` 7.0.0 gauge Should we have to rollback more than half of the seqnos seen by this vBucket we will instead rollback to 0 and re-stream from the active if set to true `kv_ep_couchstore_mprotect` 7.0.0 gauge Enable couchstore to mprotect the iobuffer `kv_ep_couchstore_tracing` 7.0.0 gauge Enable couchstore tracing `kv_ep_couchstore_write_validation` 7.0.0 gauge Validate couchstore writes `kv_ep_cross_bucket_ht_quota_sharing` 7.0.0 gauge Allow this Bucket's HashTable quota to be shared with other Buckets which have this setting enabled. `kv_ep_cursors_dropped` 7.0.0 gauge Number of cursors dropped by the checkpoint remover `kv_ep_data_read_failed` 7.0.0 gauge Total number of get failures `kv_ep_data_traffic_enabled` 7.0.0 gauge True if we want to enable data traffic after warmup is complete `kv_ep_data_write_failed` 7.0.0 gauge Total compaction and commit failures `kv_ep_db_data_size_bytes` 7.0.0 gauge / bytes Total size of valid data in db files `kv_ep_db_file_size_bytes` 7.0.0 gauge / bytes Total size of the db files `kv_ep_db_history_file_size_bytes` 7.2.0 gauge / bytes The total size of all history currently stored by the bucket `kv_ep_db_history_start_timestamp_seconds` 7.2.0 gauge / seconds The timestamp of the oldest document stored in the history window, oldest of all vbuckets `kv_ep_db_prepare_size_bytes` 7.0.0 gauge / bytes Total size of SyncWrite prepares in db files `kv_ep_dcp_backfill_byte_drain_ratio` 7.0.0 gauge What ratio of the dcp\_backfill\_byte\_limit must be drained for un-pausing a paused backfill `kv_ep_dcp_backfill_byte_limit` 7.0.0 gauge Max bytes a connection can backfill into memory before backfill is paused `kv_ep_dcp_backfill_idle_disk_threshold` 7.0.0 gauge The percentage of disk usage at which DCP backfills would be ended when no progress is made for dcp\_backfill\_idle\_limit\_seconds `kv_ep_dcp_backfill_idle_limit_seconds` 7.0.0 gauge How long (in seconds) a DCP Backfill can be held open with no progress being made. When this limit is exceeded the stream is force ended (reason Slow) releasing the resources being held by the stream. The default value is 2x of dcp\_idle\_timeout `kv_ep_dcp_backfill_idle_protection_enabled` 7.0.0 gauge When true, DCP backfills will be checked for progress. Any backfill which makes no progress for dcp\_backfill\_idle\_limit\_seconds will be subject to further checks. If the directory referenced by dbname is over dcp\_backfill\_idle\_disk\_threshold percent used and cancelling the backfill will free disk space, the scan cancels and the associated DCP stream will end with reason slow. `kv_ep_dcp_backfill_in_progress_per_connection_limit` 7.0.0 gauge The maximum number of backfills each connection can have in-progress (i.e. KVStore snapshot open and reading data from) `kv_ep_dcp_backfill_run_duration_limit` 7.0.0 gauge Maximum time (in ms) backfill task will run before yielding. `kv_ep_dcp_checkpoint_dequeue_limit` 7.0.0 gauge The limit given to CheckpointManager::getNextItemsForDcp by ActiveStream `kv_ep_dcp_consumer_buffer_ratio` 7.0.0 gauge Ratio of the BucketQuota that can be allocated by all DCP consumers for buffered messages `kv_ep_dcp_consumer_flow_control_ack_ratio` 7.0.0 gauge Ratio of freed bytes in the DCP Consumer buffer that triggers a BufferAck message to the Producer `kv_ep_dcp_consumer_flow_control_ack_seconds` 7.0.0 gauge Max seconds after which a Consumer acks all the remaining freed bytes, regardless of whether dcp\_consumer\_flow\_control\_ack\_ratio has kicked-in or not `kv_ep_dcp_consumer_flow_control_enabled` 7.0.0 gauge Whether DCP Consumer on this node enable flow control `kv_ep_dcp_enable_noop` 7.0.0 gauge Whether DCP Consumer connections should attempt to negotiate no-ops with the Producer `kv_ep_dcp_idle_timeout` 7.0.0 gauge The maximum number of seconds between dcp messages before a connection is disconnected `kv_ep_dcp_min_compression_ratio` 7.0.0 gauge Compression ratio to be achieved above which producer will ship documents as is `kv_ep_dcp_noop_mandatory_for_v5_features` 7.0.0 gauge Forces clients to enable noop for v5 features `kv_ep_dcp_noop_tx_interval` 7.0.0 gauge The time interval in seconds between noop messages being sent to the consumer `kv_ep_dcp_oso_backfill_large_value_ratio` 7.0.0 gauge When considering out-of-seqno order (OSO) DCP backfill for a collection with 'large' mean value size, OSO will only be selected if the backfilling collection item count is less than this fraction of the vBucket item count. Whether the collection has 'small' or 'large' items depends on the value of 'dcp\_oso\_backfill\_mean\_item\_size\_threshold'. `kv_ep_dcp_oso_backfill_small_item_size_threshold` 7.0.0 gauge When considering out-of-seqno order (OSO) DCP backfill for a collection, should the items in the collection be considered 'small' or 'large' and subsequently should backfill use 'dcp\_oso\_backfill\_small\_value\_collection\_ratio' or 'dcp\_oso\_backfill\_large\_value\_collection\_ratio' when deciding ot use OSO or not? Collections whoss mean on-disk value size is less than this parameter are considered 'small', otherwise they are considered 'large' `kv_ep_dcp_oso_backfill_small_value_ratio` 7.0.0 gauge When considering out-of-seqno order (OSO) DCP backfill for a collection with 'small' mean value size, OSO will only be selected if the backfilling collection item count is less than this fraction of the vBucket item count. Whether the collection has 'small' or 'large' items depends on the value of 'dcp\_oso\_backfill\_mean\_item\_size\_threshold'. `kv_ep_dcp_oso_max_collections_per_backfill` 7.0.0 gauge This is the maximum number of collections that a DCP stream can be filtering to be eligible for OSO `kv_ep_dcp_producer_catch_exceptions` 7.0.0 gauge If true, ActiveStream will catch exceptions during item processing and close the stream's related connection (and thus all streams for that connection). If false, exception will be re-thrown. `kv_ep_dcp_producer_processor_run_duration_us` 7.0.0 gauge The approximate maximum runtime in microseconds for ActiveStreamCheckpointProcessorTask `kv_ep_dcp_producer_snapshot_marker_yield_limit` 7.0.0 gauge Not in use - replaced by dcp\_producer\_processor\_run\_duration\_us `kv_ep_dcp_scan_byte_limit` 7.0.0 gauge Max bytes that can be read in a single backfill scan before yielding `kv_ep_dcp_scan_item_limit` 7.0.0 gauge Max items that can be read in a single backfill scan before yielding `kv_ep_dcp_takeover_max_time` 7.0.0 gauge Max amount of time for takeover send (in seconds) after which front end ops would return ETMPFAIL `kv_ep_defragmenter_age_threshold` 7.0.0 gauge How old (measured in number of DefragmenterVisitor passes) must a document be to be considered for defragmentation. `kv_ep_defragmenter_auto_lower_threshold` 7.0.0 gauge When mode is not static and scored fragmentation is above this value, a sleep time between defragmenter\_auto\_min\_sleep and defragmenter\_auto\_max\_sleep will be used `kv_ep_defragmenter_auto_max_sleep` 7.0.0 gauge The maximum sleep that the auto controller can set `kv_ep_defragmenter_auto_min_sleep` 7.0.0 gauge The minimum sleep that the auto controller can set `kv_ep_defragmenter_auto_pid_d` 7.0.0 gauge The d term for the PID controller `kv_ep_defragmenter_auto_pid_dt` 7.0.0 gauge The dt (interval) term for the PID controller. Value represents milliseconds `kv_ep_defragmenter_auto_pid_i` 7.0.0 gauge The i term for the PID controller `kv_ep_defragmenter_auto_pid_p` 7.0.0 gauge The p term for the PID controller `kv_ep_defragmenter_auto_upper_threshold` 7.0.0 gauge When mode is auto\_linear and scored fragmentation is above this value, the defragmenter will use defragmenter\_auto\_min\_sleep `kv_ep_defragmenter_chunk_duration` 7.0.0 gauge Maximum time (in ms) defragmentation task will run for before being paused (and resumed at the next defragmenter\_interval). `kv_ep_defragmenter_enabled` 7.0.0 gauge True if defragmenter task is enabled `kv_ep_defragmenter_interval` 7.0.0 gauge How often defragmenter task should be run (in seconds). `kv_ep_defragmenter_num_moved` 7.0.0 gauge Number of items moved by the defragmentater task. `kv_ep_defragmenter_num_visited` 7.0.0 gauge Number of items visited (considered for defragmentation) by the defragmenter task. `kv_ep_defragmenter_sleep_time_seconds` 7.6.0 gauge / seconds The amount of time the defragmenter task will sleep before it is scheduled to run again. `kv_ep_defragmenter_stored_value_age_threshold` 7.0.0 gauge How old (measured in number of DefragmenterVisitor passes) must a StoredValue be to be considered for defragmentation. `kv_ep_defragmenter_sv_num_moved` 7.0.0 gauge Number of StoredValues moved by the defragmentater task. `kv_ep_degraded_mode` 7.0.0 gauge True if the engine is either warming up or data traffic is disabled `kv_ep_diskqueue_drain` 7.0.0 gauge Total drained items on disk queue `kv_ep_diskqueue_fill` 7.0.0 gauge Total enqueued items on disk queue `kv_ep_diskqueue_items` 7.0.0 gauge Total items in disk queue `kv_ep_diskqueue_memory_bytes` 7.0.0 gauge / bytes Total memory used in disk queue `kv_ep_diskqueue_pending` 7.0.0 gauge Total bytes of pending writes `kv_ep_ephemeral_mem_recovery_enabled` 7.0.0 gauge Whether ephemeral memory recovery task is enabled. If disabled, ItemPager will carry out memory recovery for AutoDelete buckets. `kv_ep_ephemeral_mem_recovery_sleep_time` 7.0.0 gauge Duration in milliseconds the EphemeralMemRecovery task will sleep between periodic executions. `kv_ep_ephemeral_metadata_mark_stale_chunk_duration` 7.0.0 gauge Maximum time (in ms) ephemeral hash table cleaner task will run for before being paused (and resumed at the next ephemeral\_metadata\_purge\_interval). `kv_ep_ephemeral_metadata_purge_age` 7.0.0 gauge Age in seconds after which Ephemeral metadata is purged entirely from memory. Purging disabled if set to -1. `kv_ep_ephemeral_metadata_purge_interval` 7.0.0 gauge Time in seconds between automatic, periodic runs of the Ephemeral metadata purge task. Periodic purging disabled if set to 0. `kv_ep_ephemeral_metadata_purge_stale_chunk_duration` 7.0.0 gauge Maximum time (in ms) ephemeral stale metadata purge task will run for before being paused (and resumed at the next ephemeral\_metadata\_purge\_interval). `kv_ep_exp_pager_enabled` 7.0.0 gauge True if expiry pager task is enabled `kv_ep_exp_pager_initial_run_time` 7.0.0 gauge Hour in GMT time when expiry pager can be scheduled for initial run `kv_ep_exp_pager_stime` 7.0.0 gauge Number of seconds between expiry pager runs. `kv_ep_expired_access` 7.0.0 gauge Number of times an item was expired on application access `kv_ep_expired_compactor` 7.0.0 gauge Number of times an item was expired by the compactor `kv_ep_expired_pager` 7.0.0 gauge Number of times an item was expired by the item pager `kv_ep_expiry_pager_concurrency` 7.0.0 gauge Number of tasks which are created to scan for and delete expired items `kv_ep_expiry_visitor_expire_after_visit_duration_ms` 7.0.0 gauge The time limit in milliseconds for processing expired items after visiting hash tables. After finding expired items during hash table traversal, the expiry pager will process them until this duration is reached before yielding. `kv_ep_expiry_visitor_items_only_duration_ms` 7.0.0 gauge The time limit in milliseconds for processing items from the expired items list at the start of an expiry pager run. If the expired items list is not empty when the pager starts, it will only process items from this list for up to this duration before yielding. `kv_ep_failpartialwarmup` 7.0.0 gauge If true then do not allow traffic to be enabled to the bucket if warmup didn't complete successfully `kv_ep_flush_batch_max_bytes` 7.0.0 gauge Max size (in bytes) of a single flush-batch passed to the KVStore for persistence. `kv_ep_flush_duration_total_seconds` 7.0.0 gauge / seconds Cumulative milliseconds spent flushing `kv_ep_flusher_todo` 7.0.0 gauge Number of items currently being written `kv_ep_flusher_total_batch_limit` 7.0.0 gauge Number of items that all flushers can be currently flushing. Each flusher has flusher\_total\_batch\_limit / num\_writer\_threads individual batch size. Individual batches may be larger than this value, as we cannot split Memory checkpoints across multiple commits. `kv_ep_freq_counter_increment_factor` 7.0.0 gauge The increment factor of the ProbabilisticCounter being used for the frequency counter. The default value of 0.012 is set such that it allows an 8-bit ProbabilisticCounter to mimic a uint16 counter. See the comment on the ProbabilisticCounter class for more information. `kv_ep_fsync_after_every_n_bytes_written` 7.0.0 gauge Perform a file sync() operation after every N bytes written. Disabled if set to 0. `kv_ep_fusion_bytes_migrated_bytes` 8.0.0 counter / bytes Total number of bytes migrated over from the mounted source to the host volume. `kv_ep_fusion_bytes_synced_bytes` 8.0.0 counter / bytes Total number of bytes synced to FusionLogStore. `kv_ep_fusion_extent_merger_bytes_read_bytes` 8.0.0 counter / bytes Total number of bytes read in order to merge extents. `kv_ep_fusion_extent_merger_reads` 8.0.0 counter / count Total number of read IOs issued in order to merge extents. `kv_ep_fusion_file_map_mem_used_bytes` 8.0.0 gauge / bytes Total amount of memory consumed by file map. `kv_ep_fusion_log_clean_bytes_read_bytes` 8.0.0 counter / bytes Total number of bytes read in order to clean the logs. `kv_ep_fusion_log_clean_reads` 8.0.0 counter / count Total number of read IOs issued in order to clean the logs. `kv_ep_fusion_log_store_garbage_size_bytes` 8.0.0 gauge / bytes Total size of the garbage data present on FusionLogStore. `kv_ep_fusion_log_store_pending_delete_size_bytes` 8.0.0 gauge / bytes Total number of bytes not yet deleted from FusionLogStore. `kv_ep_fusion_log_store_reads` 8.0.0 counter / count Total Number of read operations issued to FusionLogStore. The read maybe answered locally if there's a cache hit. This stats also includes ep\_fusion\_log\_store\_remote\_gets. `kv_ep_fusion_log_store_remote_deletes` 8.0.0 counter / count Total number of DELETE operations issued to FusionLogStore. `kv_ep_fusion_log_store_remote_gets` 8.0.0 counter / count Total number of GET operations issued to FusionLogStore. `kv_ep_fusion_log_store_remote_lists` 8.0.0 counter / count Total number of LIST operations issued to FusionLogStore. `kv_ep_fusion_log_store_remote_puts` 8.0.0 counter / count Total number of PUT operations issued to FusionLogStore. `kv_ep_fusion_log_store_size_bytes` 8.0.0 gauge / bytes Total size of all the logs on FusionLogStore. `kv_ep_fusion_logs_cleaned` 8.0.0 counter / count Total number of logs cleaned because their garbage size crossed the fragmentation threshold. `kv_ep_fusion_logs_migrated` 8.0.0 counter / count Total number of logs migrated over from the mounted source to the host volume. `kv_ep_fusion_migration_completed_bytes_bytes` 8.0.0 gauge / bytes Total number of bytes completed in the migration. `kv_ep_fusion_migration_failures` 8.0.0 counter / count Total number of times migrating logs failed. `kv_ep_fusion_migration_total_bytes_bytes` 8.0.0 gauge / bytes Total number of bytes in the migration. `kv_ep_fusion_num_file_extents` 8.0.0 gauge / count Number of file extents on Fusion. `kv_ep_fusion_num_files` 8.0.0 gauge / count Number of files on Fusion. `kv_ep_fusion_num_log_segments` 8.0.0 gauge / count Number of log segments on Fusion. `kv_ep_fusion_num_logs_mounted` 8.0.0 counter / count Number of logs mounted on Fusion for the purpose of extent migration. `kv_ep_fusion_sync_failures` 8.0.0 counter / count Total number of times syncing data to Fusion failed. `kv_ep_fusion_sync_session_completed_bytes_bytes` 8.0.0 gauge / bytes Total number of bytes completed in the sync session. `kv_ep_fusion_sync_session_total_bytes_bytes` 8.0.0 gauge / bytes Total number of bytes in the sync session. `kv_ep_fusion_syncs` 8.0.0 counter / count Total number of times data was synced to Fusion. `kv_ep_fusion_total_file_size_bytes` 8.0.0 gauge / bytes Total size of all files on Fusion. `kv_ep_getl_default_timeout` 7.0.0 gauge The default timeout for a getl lock in (s) `kv_ep_getl_max_timeout` 7.0.0 gauge The maximum timeout for a getl lock in (s) `kv_ep_history_retention_bytes` 7.0.0 gauge Max bytes of history a bucket should aim to retain on disk. `kv_ep_history_retention_seconds` 7.0.0 gauge Seconds of history the bucket should aim to retain on disk. `kv_ep_hlc_drift_ahead_threshold_us` 7.0.0 gauge The μs threshold of drift at which we will increment a vbucket's ahead counter. `kv_ep_hlc_drift_behind_threshold_us` 7.0.0 gauge The μs threshold of drift at which we will increment a vbucket's behind counter. `kv_ep_hlc_drift_count` 7.0.0 gauge The accumulated number of times the corresponding kv\_ep\_hlc\_drift\_count has been updated `kv_ep_hlc_drift_seconds` 7.0.0 gauge / seconds The accumulated drift between this node's HLC and the remote node. For active vbucket's this represents the difference in CAS and local HLC for withMeta operations, for replica vbucket's this represents the difference in CAS and local HLC from DCP replication. `kv_ep_hlc_max_future_threshold_us` 7.0.0 gauge The acceptable μs threshold of drift at which we accept a new cas value. `kv_ep_ht_item_memory_bytes` 7.1.0 gauge / bytes The total byte size of all items, no matter the vbucket's state, no matter if an item's value is ejected. Tracks the same value as ep\_total\_cache\_size `kv_ep_ht_locks` 7.0.0 gauge `kv_ep_ht_resize_interval` 7.0.0 gauge Interval in seconds to wait between HashtableResizerTask executions. `kv_ep_ht_size` 7.0.0 gauge The initial and minimum number of slots in HashTable objects. `kv_ep_ht_size_decrease_delay` 7.0.0 gauge Delay in seconds before decreasing the size of a HashTable following a previous resize. `kv_ep_ht_temp_items_allowed_percent` 7.0.0 gauge `kv_ep_io_bg_fetch_read_count` 7.0.0 gauge Accumulated count of read system calls issued by BG fetches, only maintained by couchstore buckets `kv_ep_io_compaction_read_bytes_bytes` 7.0.0 gauge / bytes Total number of bytes read during compaction `kv_ep_io_compaction_write_bytes_bytes` 7.0.0 gauge / bytes Total number of bytes written during compaction `kv_ep_io_document_write_bytes_bytes` 7.0.0 gauge / bytes Total number of bytes written. Only maintained by couchstore buckets and includes Couchstore B-Tree and other overheads `kv_ep_io_total_read_bytes_bytes` 7.0.0 gauge / bytes Total number of bytes read `kv_ep_io_total_write_bytes_bytes` 7.0.0 gauge / bytes Total number of bytes written `kv_ep_item_begin_failed` 7.0.0 gauge Number of times a transaction failed to start due to storage errors `kv_ep_item_commit_failed` 7.0.0 gauge Number of times a transaction failed to commit due to storage errors `kv_ep_item_compressor_chunk_duration` 7.0.0 gauge Maximum time (in ms) item compression task will run for before being paused (and resumed at the next item\_compressor\_interval). `kv_ep_item_compressor_interval` 7.0.0 gauge How often the item compressor task should run (in milliseconds) `kv_ep_item_compressor_num_compressed` 7.0.0 gauge Number of items compressed by the item compressor task. `kv_ep_item_compressor_num_visited` 7.0.0 gauge Number of items visited (considered for compression) by the item compressor task. `kv_ep_item_eviction_age_percentage` 7.0.0 gauge The age percentage used when determining the age threshold in the learning\_age\_and\_mfu eviction policy. `kv_ep_item_eviction_freq_counter_age_threshold` 7.0.0 gauge `kv_ep_item_eviction_initial_mfu_percentile` 7.0.0 gauge Percentile of existing item MFU distribution to use to determine the MFU to give to new items (0 would insert new items with MFU equal to that of the coldest item present; 100 to that of hottest item present) for the upfront\_mfu\_only eviction strategy. `kv_ep_item_eviction_initial_mfu_update_interval` 7.0.0 gauge Time between updates of the initial MFU given to new items (seconds) `kv_ep_item_flush_expired` 7.0.0 gauge Number of times an item is not flushed due to the expiry of the item `kv_ep_item_flush_failed` 7.0.0 gauge Number of times an item failed to flush due to storage errors `kv_ep_item_freq_decayer_chunk_duration` 7.0.0 gauge Maximum time (in ms) itemFreqDecayer task will run for before being paused. `kv_ep_item_freq_decayer_percent` 7.0.0 gauge The percent that the frequency counter of a document is decayed when visited by item\_freq\_decayer. `kv_ep_item_num` 7.0.0 gauge The number of item objects allocated `kv_ep_item_num_allocated_total` 7.6.0 counter The number of item object allocations `kv_ep_item_num_freed_total` 7.6.0 counter The number of item object deallocations `kv_ep_items_expelled_from_checkpoints` 7.0.0 counter Number of items expelled from checkpoints. Expelled refers to items that have been ejected from memory but are still considered to be part of the checkpoint. `kv_ep_items_rm_from_checkpoints` 7.0.0 counter Number of items removed from closed unreferenced checkpoints `kv_ep_key_value_size_bytes` 7.0.0 gauge / bytes Memory used to store items metadata, keys and values in the system, no matter the vbucket's state `kv_ep_magma_active_disk_usage_bytes` 7.2.0 gauge / bytes Compressed disk size of latest version of the LSM Trees. This includes history `kv_ep_magma_block_cache_hits` 7.1.0 gauge Number of block cache hits `kv_ep_magma_block_cache_mem_used_bytes` 7.1.0 gauge / bytes Memory used by block cache. Accounts for allocated size of blocks that includes allocator internal fragmentation and any internal cache overheads due to auxilliary structures `kv_ep_magma_block_cache_misses` 7.1.0 gauge Number of block cache misses `kv_ep_magma_bloom_filter_accuracy` 7.0.0 gauge Magma maintains a bloom filter per sstable in the LSMTree. The bloom filters are used to reduce IO in case of non-existent This config sets the accuracy of the bloom filters ie. (1 - accuracy) = false positive rate `kv_ep_magma_bloom_filter_accuracy_for_bottom_level` 7.0.0 gauge The bloom filters at the bottom level are used to avoid IO in case of non-existent keys. Also most of the data resides in the bottom level. This config allows for lowering of bloom filter accuracy of sstables residing in the lowermost level of the LSMTree. `kv_ep_magma_bloom_filter_mem_used_bytes` 7.1.0 gauge / bytes Bloom filter memory usage in all versions of the LSM Trees `kv_ep_magma_buffer_mem_used_bytes` 7.1.0 gauge / bytes Memory usage for some buffers `kv_ep_magma_bytes_incoming_bytes` 7.1.0 gauge / bytes Data written to key, seq, local index as part of the KV frontend writes. `kv_ep_magma_bytes_outgoing_bytes` 7.1.0 gauge / bytes Total bytes returned via get (excluding bytes returned from sequence iterator) `kv_ep_magma_bytes_per_read_ratio` 7.1.0 gauge / ratio Bytes read by get / number of Gets `kv_ep_magma_checkpoint_disk_usage_bytes` 7.2.0 gauge / bytes Checkpoint overhead `kv_ep_magma_checkpoint_interval` 7.0.0 gauge Frequency of checkpoint interval; in seconds. A checkpoint provides a rollback point to which the data store can rollback to in the event of a failure. `kv_ep_magma_checkpoint_threshold` 7.0.0 gauge Threshold of data written before a checkpoint is created; threshold is based on a fraction of the total data size. Checkpoints require data to be retained in order to provide rollback capability. If the amount of data written during a checkpoint interval is large, we need to do more frequent checkpoints to reduce space amplification. `kv_ep_magma_compactions` 7.1.0 gauge Count of Magma compactions in key, seq and local index. `kv_ep_magma_data_blocks_compressed_size` 7.2.0 gauge Data blocks compressed size; actual size in storage `kv_ep_magma_data_blocks_compression_ratio_ratio` 7.2.0 gauge / ratio The compression ratio calculated by dividing the uncompressed data size by the compressed data size `kv_ep_magma_data_blocks_space_reduction_estimate_pct_ratio` 7.2.0 gauge / ratio Estimated percentage of space savings in compressed data blocks (0-100) `kv_ep_magma_data_blocks_uncompressed_size` 7.2.0 gauge Data blocks uncompressed size `kv_ep_magma_delete_frag_ratio` 7.0.0 gauge Magma compaction always removes duplicate keys but not all sstables are visited during compaction.. This is the minimum fragmentation ratio threshold for when a compaction will be triggerred. `kv_ep_magma_delete_memtable_writecache` 7.0.0 gauge Magma uses a lazy update model to maintain the sequence index. It maintains a list of deleted seq #s that were deleted from the key Index. `kv_ep_magma_drop_encryption_keys_compactions` 8.0.0 gauge Count of Magma compactions issued to drop older encryption keys. `kv_ep_magma_enable_block_cache` 7.0.0 gauge The block cache is an LRU policy driven cache that is used to maintain index blocks for the sstable's btrees. `kv_ep_magma_enable_direct_io` 7.0.0 gauge Using direct IO tells magma to bypass the file system cache when writing or reading sstables. `kv_ep_magma_enable_group_commit` 7.0.0 gauge Group Commit allows transactions in magma to be grouped together to reduce the number of WAL fsyncs. When a transaction is ready to fsync, if there are new transactions waiting to start, we stall the transaction waiting to fsync until there are no more transactions waiting to start for a given magma instance. `kv_ep_magma_enable_memory_optimized_writes` 7.0.0 gauge When enabled, if copying a write batch into memtable results in exceeding the write cache quota, Magma avoids the copy and instead flushes the batch to disk on the writer thread itself. This tradeoffs an increase in write latency for reduced memory consumption and obeys quota limits. If copying a batch keeps us under the quota, Magma will to continue to copy and do the flush in background. `kv_ep_magma_enable_upsert` 7.0.0 gauge When true, the kv\_engine will utilize Magma's upsert capabiltiy but accurate document counts for the data store or collections can not be maintained. `kv_ep_magma_enable_wal` 7.0.0 gauge WAL ensures Magma's atomicity, durability. Disabling it is useful in performance analysis. `kv_ep_magma_expiry_frag_threshold` 7.0.0 gauge All compactions perform expiry but not all sstables are visited by compaction. Magma maintains an expiry histogram across the kvstore to help determine which range of sstables need to have compaction run on them because there are a significant number of expired items. The frag threshold is the number of expired keys vs keys in the data store. `kv_ep_magma_expiry_purger_interval` 7.0.0 gauge Magma maintains statistics about expired documents to run compaction based on magma\_expiry\_frag\_threshold. This config determines the the expiry purger polling interval in seconds to trigger compaction on eligible sstables `kv_ep_magma_filecount_compactions` 7.1.0 gauge Number of compactions triggered by file count `kv_ep_magma_flusher_thread_percentage` 7.0.0 gauge Percentage of storage threads that are flusher threads (i.e. with a value of 20 we will allocate 4 (1/5th) of the storage threads to flushers and the remaining 16 (4/5ths) threads will be compactors). `kv_ep_magma_flushes` 7.1.0 gauge Number of write cache flushes performed `kv_ep_magma_fragmentation_percentage` 7.0.0 gauge The percentage of fragmentation a magma bucket aims to maintain. A 100 value will disable sequence tree compactions by setting the desired fragmentation percentage to 100%. Smaller compactions of the key and local indexes will still run. `kv_ep_magma_fragmentation_ratio` 7.1.0 gauge / ratio Fragmentation on disk (excludes history) `kv_ep_magma_fusion_log_checkpoint_interval` 7.0.0 gauge The interval at which FusionFS should create a log checkpoint on the FusionMetadataStore and delete eligible logs from the FusionLogStore, in seconds. `kv_ep_magma_fusion_logstore_fragmentation_threshold` 7.0.0 gauge The threshold at which the fusion log store will perform garbage collection. This is a ratio between 0.0 and 1.0. `kv_ep_magma_fusion_upload_interval` 7.0.0 gauge The interval between kvstore syncs to fusion, in seconds. `kv_ep_magma_gets` 7.1.0 gauge Number of get operations `kv_ep_magma_group_commit_max_sync_wait_duration_ms` 7.0.0 gauge When a transaction is about to stall because there are pending transactions waiting to start, if there already are transactions waiting and the oldest transaction has been waiting for magma\_group\_commit\_max\_sync\_wait\_duration ms or more, the current transaction will perform the fsync. When group commit is enabled and both magma\_group\_commit\_max\_sync\_wait\_duration and magma\_group\_commit\_max\_transaction\_count are set to 0, transactions will stall until there are no more transactions waiting to start. Unit is milliseconds. `kv_ep_magma_group_commit_max_transaction_count` 7.0.0 gauge When a transaction is about to stall because there are pending transactions waiting to start, if there already are magma\_group\_commit\_max\_transaction\_count including the current transaction waiting, the current transaction will perform the fsync. When group commit is enabled and both magma\_group\_commit\_max\_sync\_wait\_duration and magma\_group\_commit\_max\_transaction\_count are set to 0, transactions will stall until there are no more transactions waiting to start. `kv_ep_magma_heartbeat_interval` 7.0.0 gauge Frequency of heartbeat interval; in seconds. A heartbeat task is scheduled to provide cleanup and maintenance when magma is idle. `kv_ep_magma_histogram_mem_used_bytes` 7.1.0 gauge / bytes Memory usage for MagmaHistogramStats and file histograms `kv_ep_magma_history_logical_data_size_bytes` 7.2.0 gauge / bytes The logical data size of history `kv_ep_magma_history_logical_disk_size_bytes` 7.2.0 gauge / bytes The logical disk size of history `kv_ep_magma_history_size_evicted_bytes` 7.2.0 gauge / bytes History eviction bytes based on size `kv_ep_magma_history_time_evicted_bytes` 7.2.0 gauge / bytes History eviction bytes based on time `kv_ep_magma_index_resident_ratio_ratio` 7.1.0 gauge / ratio Proportion of keyIndex (data+index blocks) and seqIndex (index blocks) in memory `kv_ep_magma_initial_wal_buffer_size` 7.0.0 gauge The WAL buffer is used to stage items to the write ahead log along with control information like begin and end transaction. This parameter refers to the initial WAL buffer size. The WAL buffer will adjust its size up to a maximum of 4MB or down to a minimum of 64KB depending on the transaction batch size with consideration for other magma components which consume memory such as the block cache, bloom filters, write cache and meta data overhead. `kv_ep_magma_inserts` 7.1.0 gauge Number of DocInsert operations `kv_ep_magma_key_tree_data_block_size` 7.0.0 gauge Magma uses SSTables for storage. SSTables are made up of different types of blocks. Data blocks contain the bulk of the data and contain the key and metadata for each of the items in the block. Larger block sizes can decrease storage space by better block compression but they require more memory, cpu and io bandwidth to read and write them. `kv_ep_magma_key_tree_index_block_size` 7.0.0 gauge Magma uses SSTables for storage. SSTables are made up of different types of blocks. Index blocks contain keys that help traverse the SSTable to locate the data item. Larger block sizes can decrease storage space by better block compression but they require more memory, cpu and io bandwidth to read and write them. `kv_ep_magma_keyindex_filecount_compactions` 7.2.0 gauge Number of compactions triggered by file count for the KeyIndex `kv_ep_magma_keyindex_writer_compactions` 7.2.0 gauge Number of compaction performed on the writer thread for the KeyIndex `kv_ep_magma_logical_data_size_bytes` 7.1.0 gauge / bytes The logical data size, including history `kv_ep_magma_logical_disk_size_bytes` 7.1.0 gauge / bytes The logical disk size, including history `kv_ep_magma_lsmtree_object_mem_used_bytes` 7.1.0 gauge / bytes Memory used by LSMTree objects `kv_ep_magma_max_checkpoints` 7.0.0 gauge Maximum # of checkpoints retained for rollback. `kv_ep_magma_max_default_storage_threads` 7.0.0 gauge If the number of storage threads = 0, then we set the number of storage threads to this value and use magma\_flusher\_thread\_percentage to determine the ratio of flusher and compactor threads. `kv_ep_magma_max_level_0_ttl` 7.0.0 gauge Maximum time (in seconds) that data is kept in level 0 before it is merged. `kv_ep_magma_max_recovery_bytes` 7.0.0 gauge Maximum amount of data that is replayed from the WAL during magma recovery. When this threshold is reached magma, creates a temporary checkpoint to recover at. This is per kvstore and in bytes. `kv_ep_magma_max_write_cache` 7.0.0 gauge Magma uses a common skiplist to buffer all items at the shard level called the write cache. The write cache contains items from all the kvstores that are part of the shard and when it is flushed, each kvstore will receive a few items each. Regardless of how much memory might be available, this would be the maximum amount that could be allocated. `kv_ep_magma_mem_quota_low_watermark_ratio` 7.0.0 gauge Fraction of memory quota used by magma as it's low water mark. Magma uses this low watermark to size it's write cache and block cache. This sizing includes bloom filters memory usage but bloom filter eviction is based on the memory quota `kv_ep_magma_mem_quota_ratio` 7.0.0 gauge Magma total memory ratio of the Bucket Quota across all shards and Magma limit's it's memory usage to this value. `kv_ep_magma_min_checkpoint_interval` 7.0.0 gauge Minimum interval between two checkpoints; in seconds. Prevents excessive creation of checkpoints. `kv_ep_magma_min_value_block_size_threshold` 7.0.0 gauge Magma creates value blocks for values larger than this size. Value blocks only contain a single KV item and their reads/writes are optimised for lesser memory consumption as it avoids many value copies. For example, magma block compression is turned off for them as compression requires an output buffer as large as the input buffer. This is fine since for such large docs, per document Snappy compression already should give good enough space savings. This setting should be >= SeqIndex data block size or else it won't take effect. `kv_ep_magma_per_document_compression_enabled` 7.0.0 gauge Apply Snappy compression to each document when persisted (magma only) `kv_ep_magma_read_ahead_buffer_mem_used_bytes` 7.1.0 gauge / bytes Memory consumed by read ahead buffers. They are used for compactions and sequence iterators. This is included in BufferMemUsed `kv_ep_magma_read_bytes_bytes` 7.1.0 gauge / bytes Total bytes read from disk as per Magma's manual accounting in various code paths `kv_ep_magma_read_bytes_compact_bytes` 7.1.0 gauge / bytes Total bytes read from disk by compactors `kv_ep_magma_read_bytes_get_bytes` 7.1.0 gauge / bytes Total bytes read from disk by gets `kv_ep_magma_readamp_get_ratio` 7.1.0 gauge / ratio Bytes Read from disk by only Get threads / Bytes outgoing `kv_ep_magma_readamp_ratio` 7.1.0 gauge / ratio Bytes read from disk / bytes outgoing. Bytes read from disk includes Gets and compactors (excluding WAL) `kv_ep_magma_readio` 7.1.0 gauge Number of read IOs performed `kv_ep_magma_readioamp_ratio` 7.1.0 gauge / ratio Number of read IOs performed by GetDocs divided by the number of GetDocs `kv_ep_magma_seq_tree_data_block_size` 7.0.0 gauge Magma uses SSTables for storage. SSTables are made up of different types of blocks. Data blocks contain the bulk of the data and contain the key, metadata and value for each of the items in the block. Larger block sizes can decrease storage space by better block compression but they require more memory, cpu and io bandwidth to read and write them. If this is less than magma\_min\_value\_block\_size\_threshold, Magma will internally auto configure the value block size to be as large as this. `kv_ep_magma_seq_tree_index_block_size` 7.0.0 gauge Magma uses SSTables for storage. SSTables are made up of different types of blocks. Index blocks contain keys that help traverse the SSTable to locate the data item. Larger block sizes can decrease storage space by better block compression but they require more memory, cpu and io bandwidth to read and write them. `kv_ep_magma_seqindex_data_compactions` 7.6.0 gauge Count of Magma compactions in seq index that compact the data level. This are already accounted in ep\_magma\_seqindex\_compactions hence not part of the magma\_compactions Prometheus stat family. `kv_ep_magma_seqindex_delta_bytes_incoming_bytes` 7.6.0 gauge / bytes Data written to seq index delta levels as part of frontend update operations. This is already accounted in ep\_magma\_seqindex\_bytes\_incoming hence not part of Prometheus stat family magma\_bytes\_incoming. `kv_ep_magma_seqindex_delta_write_bytes_bytes` 7.6.0 gauge / bytes Bytes written by Magma flushes, compactions of the seq index delta levels. This is already accounted into ep\_magma\_sequndex\_write\_bytes hence not part of the Prometheus stat family magma\_write\_bytes. `kv_ep_magma_seqindex_filecount_compactions` 7.2.0 gauge Number of compactions triggered by file count for the SeqIndex `kv_ep_magma_seqindex_writer_compactions` 7.2.0 gauge Number of compaction performed on the writer thread for the SeqIndex `kv_ep_magma_sets` 7.1.0 gauge Number of set operations (DocUpsert) `kv_ep_magma_sync_every_batch` 7.0.0 gauge Couchstore generates a commit point at the end of every batch of items. During normal operation, Magma checkpoints are taken at every magma\_checkpoint\_interval. Many of the tests require more frequent checkpoints so this configuration parameter makes sure every batch generates a checkpoint. Each checkpoint generated in this way is a "Sync" checkpoint and isn't going to be useful for rollback as it only the latest checkpoint is a "Sync" checkpoiont. A "Rollback" checkpoint will be made instead if we set magma\_checkpoint\_interval to 0\. The "Rollback" checkpoints are stored in the checkpoint queue as potential rollback points. Should be used for testing only! `kv_ep_magma_syncs` 7.1.0 gauge Number of fsyncs performed `kv_ep_magma_table_meta_mem_used_bytes` 7.1.0 gauge / bytes Memory used by sstable metadata `kv_ep_magma_table_object_mem_used_bytes` 7.1.0 gauge / bytes Memory used by SSTable objects `kv_ep_magma_tables` 7.1.0 gauge Number of files used for tables `kv_ep_magma_tables_created` 7.1.0 gauge Number of table files created `kv_ep_magma_tables_deleted` 7.1.0 gauge Number of table files deleted `kv_ep_magma_total_disk_usage_bytes` 7.1.0 gauge / bytes Compressed size of all SSTables in all checkpoints, WAL and any other files on disk `kv_ep_magma_total_mem_used_bytes` 7.1.0 gauge / bytes Total memory used by bloom filters, write cache, block cache and index blocks This account for all versions of the trees `kv_ep_magma_tree_snapshot_mem_used_bytes` 7.6.0 gauge / bytes Memory consumed by all LSMTree TreeSnapshots `kv_ep_magma_ttl_compactions` 7.1.0 gauge Number of time-to-live based compactions `kv_ep_magma_wal_disk_usage_bytes` 7.1.0 gauge / bytes Disk usage by the WAL `kv_ep_magma_wal_mem_used_bytes` 7.1.0 gauge / bytes Total WAL memory used, including WAL buffer and any auxiliary memory `kv_ep_magma_write_bytes_bytes` 7.1.0 gauge / bytes Bytes written by Magma flushes, compactions and WAL writes. `kv_ep_magma_write_bytes_compact_bytes` 7.1.0 gauge / bytes Bytes written by Magma compactions. `kv_ep_magma_write_cache_mem_used_bytes` 7.1.0 gauge / bytes Memory usage of the write cache `kv_ep_magma_write_cache_ratio` 7.0.0 gauge Memory is maintained across 3 magma components; Bloom filters, Block cache and Write cache. The least important of these is the write cache. If there is insufficent memory for the write cache, the write cache will grow to the size of the batch and then be immediately flushed and freed. If there is available memory, the write cache is limited to 20% of the available memory (after bloom filter and block cache get their memory up to magma\_max\_write\_cache (128MB). Bloom filters are the most important and are never paged out. Bloom filter memory can cause magma to go above the memory quota. To allevaite this, the bottom layer where the majority of bloom filter memory is, won't use bloom filters when OptimizeBloomFilterForMisses is on (which it is by default). The block cache grows each time the index sizes change. But its growth is bounded by the available memory or what's left over after the bloom filter memory is subtracted. `kv_ep_magma_writer_compactions` 7.1.0 gauge Number of compaction performed on the writer thread `kv_ep_max_checkpoints` 7.0.0 gauge The expected max number of checkpoints in each VBucket on a balanced system. Note: That is not a hard limit on the single vbucket. That is used (together with checkpoint\_memory\_ratio) for computing checkpoint\_max\_size, which triggers checkpoint creation. `kv_ep_max_failover_entries` 7.0.0 gauge maximum number of failover log entries `kv_ep_max_item_privileged_bytes` 7.0.0 gauge Maximum number of bytes allowed for 'privileged' (system) data for an item in addition to the max\_item\_size bytes `kv_ep_max_item_size` 7.0.0 gauge Maximum number of bytes allowed for an item `kv_ep_max_num_bgfetchers` 7.0.0 gauge Maximum number of bg fetcher objects (the number of concurrent bg fetch tasks we can run). 0 = auto-configure which means we use the same number as the number of reader threads (num\_reader\_threads). `kv_ep_max_num_flushers` 7.0.0 gauge Maximum number of flusher objects (the number of concurrent flusher tasks we can run). 0 = auto-configure which means we use the same number as the number of shards (max\_num\_shards - for historic reasons). See also num\_writer\_threads. `kv_ep_max_num_shards` 7.0.0 gauge Maximum mumber of shards (0 = auto-configure) `kv_ep_max_num_workers` 7.0.0 gauge Bucket Priority relative to other buckets `kv_ep_max_size` 7.0.0 gauge Memory quota (in bytes) for this bucket. `kv_ep_max_threads` 7.0.0 gauge Maximum number of threads of any single class (0 = automatically select based on core count) `kv_ep_max_ttl` 7.0.0 gauge A maximum TTL (in seconds) that will apply to all new documents, documents set with no TTL will be given this value. A value of 0 means this is disabled `kv_ep_max_vbuckets` 7.0.0 gauge Maximum number of vbuckets expected `kv_ep_mem_freed_by_checkpoint_item_expel_bytes` 7.1.0 gauge / bytes Memory recovered from Checkpoint by expelling clean items (i.e. items processed by all cursors) from the queue `kv_ep_mem_freed_by_checkpoint_removal_bytes` 7.1.0 gauge / bytes Amount of memory freed through ckpt removal `kv_ep_mem_high_wat` 7.0.0 gauge The bucket's memory used high watermark. `kv_ep_mem_high_wat_percent` 7.0.0 gauge Ratio of the Bucket Quota at which to place the high watermark. This is the maximum desired memory usage. This value should be lower than mutation\_mem\_ratio to avoid no memory errors. `kv_ep_mem_low_wat` 7.0.0 gauge The bucket's memory used low watermark. `kv_ep_mem_low_wat_percent` 7.0.0 gauge Ratio of the Bucket Quota at which to place the low watermark. This is the point to which to reduce the memory usage of the bucket after hitting the high watermark. `kv_ep_mem_tracker_enabled` 7.0.0 gauge True if memory usage tracker is enabled `kv_ep_mem_used_merge_threshold_percent` 7.0.0 gauge What percent of max\_data size should we allow the estimated total memory to lag by (EPStats::getEstimatedTotalMemoryUsed) `kv_ep_meta_data_disk_bytes` 7.0.0 gauge / bytes Estimate of how much metadata has been written to disk since startup `kv_ep_meta_data_memory_bytes` 7.0.0 gauge / bytes Total memory used by meta data, including the key `kv_ep_min_compression_ratio` 7.0.0 gauge specifies a minimum compression ratio below which storing the document will be stored as uncompressed. `kv_ep_mutation_mem_ratio` 7.0.0 gauge Ratio of the Bucket Quota that can be used before mutations return tmpOOMs `kv_ep_not_locked_returns_tmpfail` 7.0.0 gauge Controls which error code should be returned when attempting to unlock an item that is not locked. When value is true, the legacy temporary\_failure is used instead of not\_locked. `kv_ep_num_access_scanner_runs` 7.0.0 gauge Number of times we ran accesss scanner to snapshot working set `kv_ep_num_access_scanner_skips` 7.0.0 gauge Number of times accesss scanner task decided not to generate access log `kv_ep_num_cas_regenerated` 8.0.0 counter The total number of CAS value regenerated `kv_ep_num_checkpoints` 7.1.0 gauge The number of checkpoint objects allocated `kv_ep_num_checkpoints_allocated_total` 7.6.0 counter The number of checkpoint object allocations `kv_ep_num_checkpoints_freed_total` 7.6.0 counter The number of checkpoint object deallocations `kv_ep_num_checkpoints_pending_destruction` 7.6.0 gauge Number of checkpoints detached from CM and owned by Destroyers `kv_ep_num_eject_failures` 7.0.0 counter Number of items that could not be ejected `kv_ep_num_expiry_pager_runs` 7.0.0 counter Number of times we ran expiry pager loops to purge expired items from memory/disk `kv_ep_num_freq_decayer_runs` 7.0.0 counter Number of times we ran the freq decayer task because a frequency counter has become saturated `kv_ep_num_invalid_cas` 8.0.0 counter The total number of invalid CAS values. `kv_ep_num_non_resident` 7.0.0 gauge The number of non-resident items `kv_ep_num_not_my_vbuckets` 7.0.0 counter Number of times Not My VBucket exception happened during runtime `kv_ep_num_pager_runs` 7.0.0 counter Number of times we ran pager loops to seek additional memory `kv_ep_num_value_ejects` 7.0.0 counter Number of times item values got ejected from memory to disk `kv_ep_num_workers` 7.0.0 gauge Global number of shared worker threads `kv_ep_oom_errors` 7.0.0 gauge Number of times unrecoverable OOMs happened while processing operations `kv_ep_pager_sleep_time_ms` 7.0.0 gauge How long in milliseconds the ItemPager will sleep for when not being requested to run `kv_ep_paging_visitor_pause_check_count` 7.0.0 gauge Expected number of times the PagingVisitor will check the pause condition per vBucket `kv_ep_pending_compactions` 7.0.0 gauge For persistent buckets, the count of compaction tasks. `kv_ep_pending_disk_ops_max_time_seconds` 8.0.0 gauge / seconds The longest time spent in a disk operation that is currently executing `kv_ep_pending_ops` 7.0.0 gauge Number of ops awaiting pending vbuckets `kv_ep_pending_ops_max` 7.0.0 gauge Max ops seen awaiting 1 pending vbucket `kv_ep_pending_ops_max_duration_seconds` 7.0.0 gauge / seconds Max time (µs) used waiting on pending vbuckets `kv_ep_pending_ops_total` 7.0.0 counter Total blocked pending ops since reset `kv_ep_persist_vbstate_total` 7.0.0 gauge Total VB persist state to disk `kv_ep_persistent_metadata_purge_age` 7.0.0 gauge Age in seconds after which tombstones may be purged. Defaults to 3 days. Max of 60 days. If this is dynamically changed for a magma bucket then magma may not trigger compactions when it should, this can be avoided by running a full manual compaction after changing this parameter. `kv_ep_primary_warmup_min_items_threshold` 7.0.0 gauge Mark primary warm-up as complete when the number of values loaded by warm-up reaches this percentage of the available values. This is checked after evaluating primry\_warmup\_min\_memory\_threshold. `kv_ep_primary_warmup_min_memory_threshold` 7.0.0 gauge Mark primary warm-up as complete when bucket memory usage reaches this percentage of max\_data\_size. This is checked before evaluating primry\_warmup\_min\_items\_threshold. `kv_ep_queue_size` 7.0.0 gauge Number of items queued for storage `kv_ep_range_scan_kv_store_scan_ratio` 7.0.0 gauge The ratio for calculating how many RangeScans can exist, a ratio of total KVStore scans. `kv_ep_range_scan_max_continue_tasks` 7.0.0 gauge The maximum number of range scan tasks that can exist concurrently. Setting to 0 results in num\_auxio\_threads - 1 tasks `kv_ep_range_scan_max_lifetime` 7.0.0 gauge The maximum lifetime in seconds for a range-scan. Scans that don't complete before this limit are cancelled `kv_ep_range_scan_read_buffer_send_size` 7.0.0 gauge The size of a buffer used to store data read during the I/O phase of a range-scan-continue. Once the buffer size is >= to this value the data is sent to the connection `kv_ep_retain_erroneous_tombstones` 7.0.0 gauge whether erroneous tombstones need to be retain during compaction. Erroneous tombstones are those that have invalid meta data in it. For example, a delete time of 0. `kv_ep_rollback_count` 7.0.0 gauge Number of rollbacks on consumer `kv_ep_secondary_warmup_estimated_value_count` 8.0.0 counter To facilitate warm-up progress tracking this value represents how many values need to be loaded to reach 100% of values loaded. This counter is only initialised when warm-up reaches the "loading access log", "loading k/v pairs" or "loading data" state and the ratio of ep\_warmup\_value\_count and this provides insight into progress. `kv_ep_secondary_warmup_min_items_threshold` 7.0.0 gauge Stop secondary warm-up when the number of values loaded by warm-up reaches this percentage of the available values. This is checked after evaluating secondary\_warmup\_min\_memory\_threshold. `kv_ep_secondary_warmup_min_memory_threshold` 7.0.0 gauge Stop secondary warm-up when bucket memory usage reaches this percentage of max\_data\_size. This is checked before evaluating secondary\_warmup\_min\_items\_threshold. `kv_ep_seqno_persistence_timeout` 7.0.0 gauge Timeout in seconds after which a pending SeqnoPersistence operation is temp-failed `kv_ep_snapshot_read_bytes` 8.0.0 gauge / bytes The number of bytes read when copying/downloading snapshots `kv_ep_startup_time_seconds` 7.0.0 gauge / seconds System-generated engine startup time `kv_ep_storedval_num` 7.0.0 gauge The number of storedval objects allocated `kv_ep_storedval_num_allocated_total` 7.6.0 counter The number of storedval object allocations `kv_ep_storedval_num_freed_total` 7.6.0 counter The number of blob object deallocations `kv_ep_storedval_size_allocated_total_bytes` 7.6.0 counter / bytes The total number of bytes ever allocated for storedval objects `kv_ep_storedval_size_freed_total_bytes` 7.6.0 counter / bytes The total number of bytes ever freed by deallocated storedval objects `kv_ep_sync_writes_max_allowed_replicas` 7.0.0 gauge The maximum number of supported replicas for SyncWrites. Attempts to issue SyncWrites against a topology with more replicas than this setting will fail with DurabilityImpossible. `kv_ep_tmp_oom_errors` 7.0.0 counter Number of times temporary OOMs happened while processing operations `kv_ep_total_cache_size_bytes` 7.0.0 gauge / bytes The total byte size of all items, no matter the vbucket's state, no matter if an item's value is ejected. Tracks the same value as ep\_ht\_item\_memory `kv_ep_total_deduplicated` 7.0.0 gauge Total number of items de-duplicated when queued to CheckpointManager `kv_ep_total_deduplicated_flusher` 7.2.0 gauge Total number of items de-duplicated when flushed to disk `kv_ep_total_del_items` 7.0.0 gauge Total number of persisted deletions `kv_ep_total_enqueued` 7.0.0 gauge Total number of items queued for persistence `kv_ep_total_new_items` 7.0.0 gauge Total number of persisted new items `kv_ep_total_persisted` 7.0.0 gauge Total number of items persisted `kv_ep_uncommitted_items` 7.0.0 gauge The amount of items that have not been written to disk `kv_ep_value_size_allocated_total_bytes` 7.6.0 counter / bytes The total number of bytes ever allocated for blob objects `kv_ep_value_size_freed_total_bytes` 7.6.0 counter / bytes The total number of bytes ever freed by deallocated blob objects `kv_ep_vb_total` 7.0.0 gauge Total vBuckets (count) `kv_ep_vbucket_del` 7.0.0 gauge Number of vbucket deletion events `kv_ep_vbucket_del_avg_walltime_seconds` 7.0.0 gauge / seconds Avg wall time (µs) spent by deleting a vbucket `kv_ep_vbucket_del_fail` 7.0.0 gauge Number of failed vbucket deletion events `kv_ep_vbucket_del_max_walltime_seconds` 7.0.0 gauge / seconds Max wall time (µs) spent by deleting a vbucket `kv_ep_vbucket_mapping_sanity_checking` 7.0.0 gauge Are vBucket mappings (key -> vBucket) checked by the server? This is a sanity checking mode which crc32 hashes the key to ensure that the client is supplying the expected vBucket for each key. `kv_ep_warmup` 7.0.0 gauge Is Warmup of existing data enabled `kv_ep_warmup_accesslog_load_batch_size` 7.0.0 gauge AccessLog loading operates in batches of this size (dictates the max number of keys issued to the KVStore::getMulti function) `kv_ep_warmup_accesslog_load_duration` 7.0.0 gauge The duration (in ms) after which warmup's LoadAccessLog phase will yield and re-schedule; allowing other tasks on the same thread pool to run. `kv_ep_warmup_backfill_scan_chunk_duration` 7.0.0 gauge The duration (in ms) after which warmup's backfill scans will yield and re-schedule; allowing other tasks on the same threads to run. `kv_ep_warmup_backfill_task_shard_ratio` 7.0.0 gauge Ratio controlling how many tasks that will be created in the KeyDump, LoadingKVPairs and LoadingData phases. This is a ratio using the number of shards as the denominator and least 1 task will be created per phase. A value of 0.0 will create tasks equal to the lower of #shards or #reader-threads, a value of 1.0 restores the orginal behaviour, 1 task per shard. `kv_ep_warmup_dups` 7.0.0 gauge Duplicates encountered during warmup `kv_ep_warmup_estimated_key_count` 7.1.0 counter To facilitate warm-up progress tracking this value represents how many keys need to be loaded to reach 100% keys loaded. This count is useful for progress tracking for Value Eviction buckets during the "loading keys" state and the ratio of ep\_warmup\_key\_count and this provides insight into progress. This value is the same for the estimated number of keys required to be loaded for secondary warmup, if secondary warmup is enabled. `kv_ep_warmup_estimated_value_count` 7.1.0 counter To facilitate warm-up progress tracking this value represents how many values need to be loaded to reach 100% of values loaded. This counter is only initialised when warm-up reaches the "loading access log", "loading k/v pairs" or "loading data" state and the ratio of ep\_warmup\_value\_count and this provides insight into progress. `kv_ep_warmup_key_count` 7.1.0 counter Number of keys warmed up `kv_ep_warmup_oom` 7.0.0 gauge OOMs encountered during warmup `kv_ep_warmup_status` 7.2.0 gauge The current status of the warmup thread `kv_ep_warmup_time_seconds` 7.0.0 gauge / seconds Time (µs) spent by warming data during Primary warm-up `kv_ep_warmup_value_count` 7.1.0 counter Number of values warmed up `kv_ep_workload_monitor_enabled` 7.0.0 gauge `kv_ep_xattr_enabled` 7.0.0 gauge `kv_fusion_migration_rate_limit_bytes` 8.0.0 gauge / bytes The rate limit for fusion extent migration, in bytes per second. `kv_fusion_sync_rate_limit_bytes` 8.0.0 gauge / bytes The rate limit for fusion sync uploads, in bytes per second. `kv_item_alloc_sizes_bytes` 7.0.0 histogram / bytes Item allocation size counters for front-end mutations (in bytes) `kv_items_in_transit` 7.6.0 gauge The number of items currently in transit (with a reference into the engine) `kv_lock_errors` 7.0.0 gauge The number of times an operation failed due to accessing a locked document `kv_logical_data_size_bytes` 7.6.0 gauge / bytes The logical size of all user data on disk (per-bucket), with compression applied `kv_magma_bytes_incoming_bytes` 7.6.0 gauge / bytes Data written as part of the KV frontend writes. `kv_magma_compactions` 7.2.0 gauge Count of Magma compactions `kv_magma_itr` 7.6.0 gauge Number of items returned by iterators `kv_magma_write_bytes_bytes` 7.6.0 gauge / bytes Bytes written by Magma flushes, compactions. `kv_magma_write_bytes_filecount_compact_bytes` 7.6.0 gauge / bytes Bytes written by Magma compactions due to file count triggers. `kv_max_system_connections` 7.6.0 gauge Maximum number of connections to the interfaces marked as system only `kv_max_user_connections` 7.6.0 gauge Maximum number of connections to the interfaces marked as user `kv_mem_used_bytes` 7.0.0 gauge / bytes Engine's total memory usage `kv_mem_used_estimate_bytes` 7.0.0 gauge / bytes Engine's total estimated memory usage (this is a faster stat to read, but lags mem\_used as it's only updated when a threshold is crossed see mem\_used\_merge\_threshold) `kv_memory_overhead_bytes` 7.0.0 gauge / bytes The "unused" memory caused by the allocator returning bigger chunks than requested `kv_memory_used_bytes` 7.0.0 gauge / bytes Memory used for various objects `kv_num_high_pri_requests` 7.0.0 gauge Num of async high priority requests `kv_num_vbuckets` 7.0.0 gauge Number of vBuckets `kv_ops` 7.0.0 counter Number of operations `kv_ops_failed` 7.0.0 counter Number of operations failed due to conflict resolution `kv_read_bytes` 7.0.0 gauge / bytes The number bytes received from all connections bound to this bucket `kv_rejected_connections` 8.0.0 counter The number of connections rejected due to hitting the maximum number of connections `kv_rollback_item_count` 7.0.0 gauge Num of items rolled back `kv_stat_timings_mem_usage_bytes` 7.1.0 gauge / bytes The memory footprint for tracing times spent processing stat requests `kv_subdoc_lookup_extracted_bytes` 7.0.0 gauge / bytes The total number of bytes from the documents being returned as part of subdoc lookup operations `kv_subdoc_lookup_searched_bytes` 7.0.0 gauge / bytes The total size of all documents used for subdoc lookup operations `kv_subdoc_mutation_inserted_bytes` 7.0.0 gauge / bytes The total number of bytes inserted into the documents via subdoc `kv_subdoc_mutation_updated_bytes` 7.0.0 gauge / bytes The total number of bytes for the documents mutated via subdoc `kv_subdoc_ops` 7.0.0 counter The number of subdoc operations `kv_subdoc_update_races` 7.6.0 gauge The number of times a subdoc mutation had to be retried as the document was changed by a different actor while performing the operation `kv_sync_write_commit_duration_seconds` 7.0.0 histogram / seconds Commit duration for SyncWrites `kv_system_connections` 7.0.0 gauge The number of connections to system ports in memcached `kv_task_duration_seconds` 7.6.2 histogram / seconds Per-task histogram of time taken to run a task `kv_thread_cpu_usage_seconds` 7.6.0 gauge / seconds Number of seconds the given thread has spent running according to the OS `kv_time_seconds` 7.0.0 gauge / seconds The servers current time (seconds since January 1st, 1970 at 00:00:00 UTC) `kv_total_connections` 7.0.0 counter The total number of connections to this system since the process started (or reset) `kv_total_memory_overhead_bytes` 7.0.0 gauge / bytes Extra memory used by transient data like persistence queue, replication queues, checkpoints, etc `kv_total_memory_used_bytes` 7.0.0 gauge / bytes Engine's total memory usage `kv_total_resp_errors` 7.0.0 gauge The number of error messages returned `kv_uptime_seconds` 7.0.0 gauge / seconds The number of seconds elapsed since process start `kv_user_connections` 7.6.0 gauge The number of connections to user ports in memcached `kv_vb_auto_delete_count` 7.0.0 gauge Cumulative count of documents auto-deleted due to NRU ejection (Ephemeral Buckets only) `kv_vb_bloom_filter_memory_bytes` 7.1.0 gauge / bytes The memory usage in bytes of the per-vBucket Bloom filters `kv_vb_checkpoint_memory_bytes` 7.0.0 gauge / bytes Total memory in checkpoints, sum of kv\_vb\_\_checkpoint\_memory\_overhead\_bytes and kv\_vb\_checkpoint\_memory\_queue\_bytes `kv_vb_checkpoint_memory_overhead_bytes` 7.0.0 gauge / bytes Checkpoints memory overhead. That is the sum of kv\_vb\_checkpoint\_memory\_overhead\_index\_bytes and kv\_vb\_checkpoint\_memory\_overhead\_queue\_bytes. `kv_vb_checkpoint_memory_overhead_index_bytes` 7.1.0 gauge / bytes Memory overhead in the checkpoints key-index. For every index entry, that accounts the internal structure allocation plus the key-size. `kv_vb_checkpoint_memory_overhead_queue_bytes` 7.1.0 gauge / bytes Memory overhead in the checkpoints internal items queue. For every item in the queue, that accounts the internal structure allocation for holding the item's reference. `kv_vb_checkpoint_memory_queue_bytes` 7.1.0 gauge / bytes Total memory of all the items queued in checkpoints. For every item in the queue, that accounts the item's key, metadata and value size. The value allocation may have shared ownership HashTable and DCP Stream readyQ. `kv_vb_curr_items` 7.0.0 gauge Count of alive (non-deleted) items in the vbucket, including non-resident items `kv_vb_dm_mem_used_bytes` 7.2.1 gauge / bytes The memory usage in bytes of the per-VBucket Durability Monitor (in-progress SyncWrites) `kv_vb_dm_num_tracked` 7.2.1 gauge The number of items tracked in the per-VBucket Durability Monitor (in-progress SyncWrites) `kv_vb_eject` 7.0.0 gauge Cumulative count of the number of items whose values have been ejected for this vBucket `kv_vb_expired` 7.0.0 gauge Cumulative count of the number of items which have been expired for this vBucket `kv_vb_ht_avg_size` 7.2.5 gauge The average size (number of slots) of the HashTable across all vbuckets `kv_vb_ht_item_memory_bytes` 7.1.0 gauge / bytes The memory usage of items stored in the HashTable `kv_vb_ht_item_memory_uncompressed_bytes` 7.1.0 gauge / bytes The memory usage of items stored in the HashTable, if the values were not compressed `kv_vb_ht_max_size` 7.2.5 gauge The maximum HashTable size (number of slots) across all vbuckets `kv_vb_ht_memory_bytes` 7.0.0 Deprecated in 8.0.0gauge / bytes Memory overhead of the HashTable `kv_vb_ht_memory_overhead_bytes` 8.0.0 gauge / bytes Memory overhead of the HashTable `kv_vb_ht_tombstone_purged_count` 7.0.0 gauge Number of purged tombstones (Ephemeral) `kv_vb_max_history_disk_size_bytes` 7.2.0 gauge / bytes The total size of history stored per-vBucket (the largest size reported by any vBucket) `kv_vb_mem_freed_by_checkpoint_item_expel_bytes` 7.1.0 gauge / bytes Memory recovered from Checkpoint by expelling clean items (i.e. items processed by all cursors) from the queue `kv_vb_mem_freed_by_checkpoint_removal_bytes` 7.1.0 gauge / bytes Amount of memory freed through ckpt removal `kv_vb_meta_data_disk_bytes` 7.0.0 gauge / bytes Estimate of how much metadata has been written to disk since startup `kv_vb_meta_data_memory_bytes` 7.0.0 gauge / bytes Total memory used by meta data, including the key `kv_vb_num_non_resident` 7.0.0 gauge The number of non-resident items `kv_vb_ops_create` 7.0.0 gauge Number of operations where an item has been flushed to disk that did not previously exist `kv_vb_ops_delete` 7.0.0 gauge Number of operations where a delete has been persisted `kv_vb_ops_get` 7.0.0 gauge Number of successful front-end get operations `kv_vb_ops_reject` 7.0.0 gauge Number of fatal errors in persisting a mutation (including deletion) `kv_vb_ops_update` 7.0.0 gauge Number of operations where a new version of an item has been persisted `kv_vb_perc_mem_resident_ratio` 7.0.0 gauge / ratio Percentage of items which are resident in memory `kv_vb_queue_age_seconds` 7.0.0 gauge / seconds Sum of disk queue item age in seconds `kv_vb_queue_drain` 7.0.0 gauge Total drained items `kv_vb_queue_fill` 7.0.0 gauge Total items enqueued on disk queues `kv_vb_queue_memory_bytes` 7.0.0 gauge / bytes Total memory used by the disk queues `kv_vb_queue_pending_bytes` 7.0.0 gauge / bytes Total bytes of pending writes in the disk queue `kv_vb_queue_size` 7.0.0 gauge Number of items in the disk queues `kv_vb_rollback_item_count` 7.0.0 gauge Total number of mutations discarded during rollback `kv_vb_seqlist_count` 7.0.0 gauge Number of items in the sequence list `kv_vb_seqlist_deleted_count` 7.0.0 gauge Number of deleted items in the sequence list `kv_vb_seqlist_purged_count` 7.0.0 gauge Number of tombstones purged from the sequence list `kv_vb_seqlist_read_range_count` 7.0.0 gauge Number of sequence numbers visible according to the sequence list read range `kv_vb_seqlist_stale_count` 7.0.0 gauge Number of stale items in the sequence list `kv_vb_seqlist_stale_metadata_bytes` 7.0.0 gauge / bytes Total bytes of stale metadata (key + fixed metadata) in the sequence list `kv_vb_seqlist_stale_value_bytes` 7.0.0 gauge / bytes Total bytes of stale values in the sequence list `kv_vb_sync_write_aborted_count` 7.0.0 gauge Total number of aborted SyncWrites `kv_vb_sync_write_accepted_count` 7.0.0 gauge Total number of accepted SyncWrites (in-progress, aborted or committed) `kv_vb_sync_write_committed_count` 7.0.0 gauge Total number of all committed SyncWrites (includes vb\_sync\_write\_committed\_not\_durable\_count) `kv_vb_sync_write_committed_not_durable_count` 8.0.0 gauge Total number of SyncWrites which could not be written durably, but were committed because the fallback was enabled (see durability\_impossible\_fallback) `kv_written_bytes` 7.0.0 gauge / bytes The number bytes sent to all connections bound to this bucket