7.0.0counter The number of audit events dropped due to errors while trying to insert them to the audit trail

7.0.0gauge Boolean value to indicate if audit is enabled or not

7.0.0gauge The number of authentication commands

7.0.0gauge The number of failed authentication requests

8.0.0histogram / seconds Timing histogram for external authentication execution times

8.0.0histogram / seconds Timing histogram for external authorization execution times

8.0.0gauge The number of received external authentication responses

8.0.0gauge The total number of requests sent to the external authentication provider

7.0.0histogram Batch size for background fetches

7.0.0histogram / seconds Background fetches waiting for disk

7.0.0histogram / seconds Background fetches waiting in the dispatcher queue

7.6.0gauge The number of references to the bucket

7.0.0histogram / seconds Per-opcode histogram of time taken to execute operations

7.0.0counter The number of lookup operations. This includes operations such as Get, Gat, Getk, Getq, GetLocked, GetRandomKey, GetReplica, SubdocMultiLookup, SubdocGet and SubdocExists

7.0.0gauge The number of lookup operations performed within the last 10 seconds. This aggregates operations like Get, Gat, Getk, Getq, and various Sub-Document lookups

7.0.0gauge / 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

7.0.0counter 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.)

7.0.0gauge The number of mutation operations performed within the last 10 seconds. This includes operations like Add, Append, Delete, Replace, and various Sub-Document mutations

7.0.0gauge / 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

7.0.0gauge / bytes Per-collection data size on disk for active vbuckets only

7.2.0gauge Whether history (CDC) is enabled for each collection

7.0.0gauge Per-collection item count for active vbuckets only

7.0.0gauge / seconds Per-collection maxTTL (maximum expiry) if configured

7.0.0gauge / bytes Per-collection memory usage for active vbuckets only

7.0.0counter Per-collection counters of operations that perform store/get(read)/delete type operations against active vbuckets

7.2.0counter 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)

7.6.0counter The total number all clients in this bucket yield due to using their entire timeslice

7.0.0counter The total number all clients in this bucket yield due to consuming the number of ops allowed for the current timeslice

7.0.0gauge Current number of allocated connection structures

7.0.0gauge The current number of connections. This includes user, system and daemon connections

8.0.0gauge The current number of connections currently closing down

7.0.0gauge Count of alive (non-deleted) items in active vbuckets, including non-resident items

7.0.0gauge Total number of items

7.0.0gauge Number of temporary items in memory

7.6.5gauge The current number of authenticated connections using the labelled SDK

7.0.0gauge The number of server sockets currently in use

7.1.0gauge / bytes Total amount of memory allocated (outside the context of a bucket)

7.1.0gauge / bytes Total amount of memory resident (outside the context of a bucket)

7.0.2gauge Count of items in memory with a given datatype combination

7.0.0gauge Number of times Consumer DCP connections (i.e., replica) have paused consuming items because memory usage is too high

7.0.0gauge Current number of DCP connections (Consumers or Producers)

7.0.0gauge Current number of DCP connections

7.2.1gauge Number of items pushed into the DCP stream ready queue from a backfill

7.0.0gauge Current total number of items remaining for to be sent for all outgoing DCP streams (approximate)

7.0.0gauge Total number of items sent out by all currently existing outgoing DCP streams, since each stream was created

7.0.2gauge Maximum number of backfills across all DCP connections

7.0.2gauge Total number of running backfills across all DCP connections

7.6.0gauge Count of how many times the DCP connection has been paused

7.1.0gauge / bytes Estimated memory usage of items waiting to be sent across all existing DCP connections

7.6.0gauge Current number of Streams (Active or Passive)

7.0.0gauge / bytes Total data sent across all existing DCP connections

7.0.0gauge / bytes Total equivalent uncompressed size of data sent across all existing DCP connections

7.6.0gauge Count of how many times the DCP connection has been unpaused

7.0.0histogram / seconds time spent waiting for disk

7.1.0gauge / bytes Current memory used in KV for primary/secondary domain

7.0.0gauge True if access scanner task is enabled

7.0.0gauge / seconds Number of seconds that last Access Scanner task run took to complete.

7.0.0gauge Number of items that last Access Scanner task run wrote to the Access Log.

7.0.0counter Total number of times a vbucket saw an item with a HLC CAS from too far in the future (indicating the clock is behind)

7.0.0gauge Let EPE delete/prepare/del_with_meta prune any invalid body in the payload instead of failing

7.0.0gauge Logging block size.

7.0.0gauge The maximum number of items the Access Scanner will hold in memory before commiting them to disk

7.0.0gauge Resident ratio percentage above which we do not generate access log

7.0.0gauge Number of minutes between each sweep for the access log

7.0.0gauge Hour in GMT time when access scanner task is scheduled to run

7.6.0gauge / bytes The total memory allocated from the engine's arena

7.6.0gauge / bytes The resident set size of the engine's arena

7.0.0gauge Memory usage threshold (percentage of bucket quota) after which backfill will be snoozed.

7.0.0counter Total number of times a vbucket saw an item with a HLC CAS from too far in the past (indicating the clock is ahead)

7.0.0gauge Enable or disable the bloom filter

7.0.0gauge Bloomfilter: Allowed probability for false positives

7.0.0gauge Bloomfilter: Estimated key count per vbucket

7.0.0gauge If resident ratio (during full eviction) were found less than this threshold, compaction will include all items into bloomfilter

7.0.0gauge / ratio Average read amplification for all background fetch operations - ratio of read()s to documents fetched.

7.0.0counter Number of items fetched from disk

7.1.5counter The number of bgfetches which are triggered by compaction

7.0.0gauge / seconds The average time for an item to be loaded from disk

7.0.0counter / seconds The total elapsed time for items to be loaded from disk

7.0.0gauge / seconds The longest load time when loading from disk

7.0.0gauge / seconds The longest time in the queue waiting to be loaded from disk

7.0.0counter Number of metadata fetches from disk

7.0.0gauge / seconds The shortest load time when loading from disk

7.0.0gauge / seconds The shortest time in the queue waiting to be loaded from disk

7.0.0gauge The number of samples included in the average

7.0.0gauge Number of remaining bg fetch items

7.0.0gauge Number of remaining bg fetch jobs

7.0.0gauge / seconds The average wait time for an item before it's serviced by the dispatcher

7.0.0gauge / seconds The total elapse time for the wait queue

7.0.0gauge The number of blob objects in the cache

7.6.0counter The number of blob object allocations

7.6.0counter The number of blob object deallocations

7.0.0gauge Time in seconds between the BucketQuotaChangeTask polling memory usage to attempt to reduce the bucket quota

7.0.0gauge Memory quota (in bytes) for this bucket.

7.1.0gauge / bytes Actual max size in bytes of a single Checkpoint

7.6.2gauge / bytes Max allocation allowed in all checkpoints (including the dcp consumer buffer quota)

7.0.0gauge Number of tasks responsible for destroying closed unreferenced checkpoints.

7.0.0gauge Max size (in bytes) of a single checkpoint. '0' for EPEngine auto-setup.

7.0.0gauge / bytes Memory of items in all checkpoints

7.1.0gauge / bytes Memory of checkpoint structures awaiting destruction by a background task

7.1.0gauge / bytes Max allocation allowed in all checkpoints

7.0.0gauge Max ratio of the bucket quota that can be allocated in checkpoints. The system enters a TempOOM phase if hit.

7.0.0gauge Fraction of the checkpoint quota (as computed by checkpoint_memory_ratio) that represents the target of checkpoint memory recovery. Memory recovery yields when reached.

7.1.0gauge Fraction of the checkpoint quota (as computed by checkpoint_memory_ratio) that represents the target of checkpoint memory recovery. Memory recovery yields when reached

7.0.0gauge Fraction of the checkpoint quota (as computed by checkpoint_memory_ratio) that triggers attempt of memory releasing from checkpoint.

7.1.0gauge Fraction of the checkpoint quota (as computed by checkpoint_memory_ratio) that triggers attempt of memory releasing from checkpoint

7.0.0gauge Number of concurrent tasks performing ItemExpel and CursorDrop/CheckpointRemoval

7.0.0gauge 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.

7.0.0gauge Number of remaining vbuckets for checkpoint persistence

7.0.0gauge ep_active_ahead_exceptions + ep_replica_ahead_exceptions

7.0.0gauge How many milliseconds before compaction runs following the drop of a collection

7.0.0gauge Enable the collections functionality, enabling the storage of collection metadata

7.0.0gauge Total number of write commits

7.0.0gauge / seconds Number of milliseconds of most recent commit

7.0.0gauge / seconds Cumulative milliseconds spent committing

7.1.0gauge Counter of how many times compaction aborted, e.g. the vbucket is required to rollback, so compaction is aborted

7.0.0gauge 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)?

7.0.0gauge 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

7.1.0gauge Counter of how many times compaction has failed, e.g. a system call error caused compaction to fail

7.0.0gauge 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.

7.0.0gauge Number of eviction pager tasks to create when memory usage is high

7.0.0gauge How often connection manager task should release dead connections (in seconds).

7.0.0gauge How often connection manager task should be run (in seconds).

8.0.0gauge Number of times the continuous backup metadata callback was run.

8.0.0gauge / seconds Time spent in KV in the continuous backup metadata callback.

7.0.0gauge True if continouous backup is enabled.

7.0.0gauge The continouous backup interval (in seconds).

7.0.0gauge 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).

7.0.0gauge 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

7.0.0gauge Enable couchstore to mprotect the iobuffer

7.0.0gauge Enable couchstore tracing

7.0.0gauge Validate couchstore writes

7.0.0gauge Allow this Bucket's HashTable quota to be shared with other Buckets which have this setting enabled.

7.0.0gauge Number of cursors dropped by the checkpoint remover

7.0.0gauge Total number of get failures

7.0.0gauge True if we want to enable data traffic after warmup is complete

7.0.0gauge Total compaction and commit failures

7.0.0gauge / bytes Total size of valid data in db files

7.0.0gauge / bytes Total size of the db files

7.2.0gauge / bytes The total size of all history currently stored by the bucket

7.2.0gauge / seconds The timestamp of the oldest document stored in the history window, oldest of all vbuckets

7.0.0gauge / bytes Total size of SyncWrite prepares in db files

7.0.0gauge What ratio of the dcp_backfill_byte_limit must be drained for un-pausing a paused backfill

7.0.0gauge Max bytes a connection can backfill into memory before backfill is paused

7.0.0gauge The percentage of disk usage at which DCP backfills would be ended when no progress is made for dcp_backfill_idle_limit_seconds

7.0.0gauge 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

7.0.0gauge 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.

7.0.0gauge The maximum number of backfills each connection can have in-progress (i.e. KVStore snapshot open and reading data from)

7.0.0gauge Maximum time (in ms) backfill task will run before yielding.

7.0.0gauge The limit given to CheckpointManager::getNextItemsForDcp by ActiveStream

7.0.0gauge Ratio of the BucketQuota that can be allocated by all DCP consumers for buffered messages

7.0.0gauge Ratio of freed bytes in the DCP Consumer buffer that triggers a BufferAck message to the Producer

7.0.0gauge 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

7.0.0gauge Whether DCP Consumer on this node enable flow control

7.0.0gauge Whether DCP Consumer connections should attempt to negotiate no-ops with the Producer

7.0.0gauge The maximum number of seconds between dcp messages before a connection is disconnected

7.0.0gauge Compression ratio to be achieved above which producer will ship documents as is

7.0.0gauge Forces clients to enable noop for v5 features

7.0.0gauge The time interval in seconds between noop messages being sent to the consumer

7.0.0gauge 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'.

7.0.0gauge 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'

7.0.0gauge 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'.

7.0.0gauge This is the maximum number of collections that a DCP stream can be filtering to be eligible for OSO

7.0.0gauge 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.

7.0.0gauge The approximate maximum runtime in microseconds for ActiveStreamCheckpointProcessorTask

7.0.0gauge Not in use - replaced by dcp_producer_processor_run_duration_us

7.0.0gauge Max bytes that can be read in a single backfill scan before yielding

7.0.0gauge Max items that can be read in a single backfill scan before yielding

7.0.0gauge Max amount of time for takeover send (in seconds) after which front end ops would return ETMPFAIL

7.0.0gauge How old (measured in number of DefragmenterVisitor passes) must a document be to be considered for defragmentation.

7.0.0gauge 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

7.0.0gauge The maximum sleep that the auto controller can set

7.0.0gauge The minimum sleep that the auto controller can set

7.0.0gauge The d term for the PID controller

7.0.0gauge The dt (interval) term for the PID controller. Value represents milliseconds

7.0.0gauge The i term for the PID controller

7.0.0gauge The p term for the PID controller

7.0.0gauge When mode is auto_linear and scored fragmentation is above this value, the defragmenter will use defragmenter_auto_min_sleep

7.0.0gauge Maximum time (in ms) defragmentation task will run for before being paused (and resumed at the next defragmenter_interval).

7.0.0gauge True if defragmenter task is enabled

7.0.0gauge How often defragmenter task should be run (in seconds).

7.0.0gauge Number of items moved by the defragmentater task.

7.0.0gauge Number of items visited (considered for defragmentation) by the defragmenter task.

7.6.0gauge / seconds The amount of time the defragmenter task will sleep before it is scheduled to run again.

7.0.0gauge How old (measured in number of DefragmenterVisitor passes) must a StoredValue be to be considered for defragmentation.

7.0.0gauge Number of StoredValues moved by the defragmentater task.

7.0.0gauge True if the engine is either warming up or data traffic is disabled

7.0.0gauge Total drained items on disk queue

7.0.0gauge Total enqueued items on disk queue

7.0.0gauge Total items in disk queue

7.0.0gauge / bytes Total memory used in disk queue

7.0.0gauge Total bytes of pending writes

7.0.0gauge Whether ephemeral memory recovery task is enabled. If disabled, ItemPager will carry out memory recovery for AutoDelete buckets.

7.0.0gauge Duration in milliseconds the EphemeralMemRecovery task will sleep between periodic executions.

7.0.0gauge Maximum time (in ms) ephemeral hash table cleaner task will run for before being paused (and resumed at the next ephemeral_metadata_purge_interval).

7.0.0gauge Age in seconds after which Ephemeral metadata is purged entirely from memory. Purging disabled if set to -1.

7.0.0gauge Time in seconds between automatic, periodic runs of the Ephemeral metadata purge task. Periodic purging disabled if set to 0.

7.0.0gauge Maximum time (in ms) ephemeral stale metadata purge task will run for before being paused (and resumed at the next ephemeral_metadata_purge_interval).

7.0.0gauge True if expiry pager task is enabled

7.0.0gauge Hour in GMT time when expiry pager can be scheduled for initial run

7.0.0gauge Number of seconds between expiry pager runs.

7.0.0gauge Number of times an item was expired on application access

7.0.0gauge Number of times an item was expired by the compactor

7.0.0gauge Number of times an item was expired by the item pager

7.0.0gauge Number of tasks which are created to scan for and delete expired items

7.0.0gauge 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.

7.0.0gauge 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.

7.0.0gauge If true then do not allow traffic to be enabled to the bucket if warmup didn't complete successfully

7.0.0gauge Max size (in bytes) of a single flush-batch passed to the KVStore for persistence.

7.0.0gauge / seconds Cumulative milliseconds spent flushing

7.0.0gauge Number of items currently being written

7.0.0gauge 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.

7.0.0gauge 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.

7.0.0gauge Perform a file sync() operation after every N bytes written. Disabled if set to 0.

8.0.0counter / bytes Total number of bytes migrated over from the mounted source to the host volume.

8.0.0counter / bytes Total number of bytes synced to FusionLogStore.

8.0.0counter / bytes Total number of bytes read in order to merge extents.

8.0.0counter / count Total number of read IOs issued in order to merge extents.

8.0.0gauge / bytes Total amount of memory consumed by file map.

8.0.0counter / bytes Total number of bytes read in order to clean the logs.

8.0.0counter / count Total number of read IOs issued in order to clean the logs.

8.0.0gauge / bytes Total size of the garbage data present on FusionLogStore.

8.0.0gauge / bytes Total number of bytes not yet deleted from FusionLogStore.

8.0.0counter / 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.

8.0.0counter / count Total number of DELETE operations issued to FusionLogStore.

8.0.0counter / count Total number of GET operations issued to FusionLogStore.

8.0.0counter / count Total number of LIST operations issued to FusionLogStore.

8.0.0counter / count Total number of PUT operations issued to FusionLogStore.

8.0.0gauge / bytes Total size of all the logs on FusionLogStore.

8.0.0counter / count Total number of logs cleaned because their garbage size crossed the fragmentation threshold.

8.0.0counter / count Total number of logs migrated over from the mounted source to the host volume.

8.0.0gauge / bytes Total number of bytes completed in the migration.

8.0.0counter / count Total number of times migrating logs failed.

8.0.0gauge / bytes Total number of bytes in the migration.

8.0.0gauge / count Number of file extents on Fusion.

8.0.0gauge / count Number of files on Fusion.

8.0.0gauge / count Number of log segments on Fusion.

8.0.0counter / count Number of logs mounted on Fusion for the purpose of extent migration.

8.0.0counter / count Total number of times syncing data to Fusion failed.

8.0.0gauge / bytes Total number of bytes completed in the sync session.

8.0.0gauge / bytes Total number of bytes in the sync session.

8.0.0counter / count Total number of times data was synced to Fusion.

8.0.0gauge / bytes Total size of all files on Fusion.

7.0.0gauge The default timeout for a getl lock in (s)

7.0.0gauge The maximum timeout for a getl lock in (s)

7.0.0gauge Max bytes of history a bucket should aim to retain on disk.

7.0.0gauge Seconds of history the bucket should aim to retain on disk.

7.0.0gauge The μs threshold of drift at which we will increment a vbucket's ahead counter.

7.0.0gauge The μs threshold of drift at which we will increment a vbucket's behind counter.

7.0.0gauge The accumulated number of times the corresponding kv_ep_hlc_drift_count has been updated

7.0.0gauge / 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.

7.0.0gauge The acceptable μs threshold of drift at which we accept a new cas value.

7.1.0gauge / 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

7.0.0gauge

7.0.0gauge Interval in seconds to wait between HashtableResizerTask executions.

7.0.0gauge The initial and minimum number of slots in HashTable objects.

7.0.0gauge Delay in seconds before decreasing the size of a HashTable following a previous resize.

7.0.0gauge

7.0.0gauge Accumulated count of read system calls issued by BG fetches, only maintained by couchstore buckets

7.0.0gauge / bytes Total number of bytes read during compaction

7.0.0gauge / bytes Total number of bytes written during compaction

7.0.0gauge / bytes Total number of bytes written. Only maintained by couchstore buckets and includes Couchstore B-Tree and other overheads

7.0.0gauge / bytes Total number of bytes read

7.0.0gauge / bytes Total number of bytes written

7.0.0gauge Number of times a transaction failed to start due to storage errors

7.0.0gauge Number of times a transaction failed to commit due to storage errors

7.0.0gauge Maximum time (in ms) item compression task will run for before being paused (and resumed at the next item_compressor_interval).

7.0.0gauge How often the item compressor task should run (in milliseconds)

7.0.0gauge Number of items compressed by the item compressor task.

7.0.0gauge Number of items visited (considered for compression) by the item compressor task.

7.0.0gauge The age percentage used when determining the age threshold in the learning_age_and_mfu eviction policy.

7.0.0gauge

7.0.0gauge 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.

7.0.0gauge Time between updates of the initial MFU given to new items (seconds)

7.0.0gauge Number of times an item is not flushed due to the expiry of the item

7.0.0gauge Number of times an item failed to flush due to storage errors

7.0.0gauge Maximum time (in ms) itemFreqDecayer task will run for before being paused.

7.0.0gauge The percent that the frequency counter of a document is decayed when visited by item_freq_decayer.

7.0.0gauge The number of item objects allocated

7.6.0counter The number of item object allocations

7.6.0counter The number of item object deallocations

7.0.0counter 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.

7.0.0counter Number of items removed from closed unreferenced checkpoints

7.0.0gauge / bytes Memory used to store items metadata, keys and values in the system, no matter the vbucket's state

7.2.0gauge / bytes Compressed disk size of latest version of the LSM Trees. This includes history

7.1.0gauge Number of block cache hits

7.1.0gauge / 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

7.1.0gauge Number of block cache misses

7.0.0gauge 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

7.0.0gauge 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.

7.1.0gauge / bytes Bloom filter memory usage in all versions of the LSM Trees

7.1.0gauge / bytes Memory usage for some buffers

7.1.0gauge / bytes Data written to key, seq, local index as part of the KV frontend writes.

7.1.0gauge / bytes Total bytes returned via get (excluding bytes returned from sequence iterator)

7.1.0gauge / ratio Bytes read by get / number of Gets

7.2.0gauge / bytes Checkpoint overhead

7.0.0gauge 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.

7.0.0gauge 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.

7.1.0gauge Count of Magma compactions in key, seq and local index.

7.2.0gauge Data blocks compressed size; actual size in storage

7.2.0gauge / ratio The compression ratio calculated by dividing the uncompressed data size by the compressed data size

7.2.0gauge / ratio Estimated percentage of space savings in compressed data blocks (0-100)

7.2.0gauge Data blocks uncompressed size

7.0.0gauge 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.

7.0.0gauge 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.

8.0.0gauge Count of Magma compactions issued to drop older encryption keys.

7.0.0gauge The block cache is an LRU policy driven cache that is used to maintain index blocks for the sstable's btrees.

7.0.0gauge Using direct IO tells magma to bypass the file system cache when writing or reading sstables.

7.0.0gauge 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.

7.0.0gauge 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.

7.0.0gauge 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.

7.0.0gauge WAL ensures Magma's atomicity, durability. Disabling it is useful in performance analysis.

7.0.0gauge 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.

7.0.0gauge 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

7.1.0gauge Number of compactions triggered by file count

7.0.0gauge 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).

7.1.0gauge Number of write cache flushes performed

7.0.0gauge 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.

7.1.0gauge / ratio Fragmentation on disk (excludes history)

7.0.0gauge The interval at which FusionFS should create a log checkpoint on the FusionMetadataStore and delete eligible logs from the FusionLogStore, in seconds.

7.0.0gauge The threshold at which the fusion log store will perform garbage collection. This is a ratio between 0.0 and 1.0.

7.0.0gauge The interval between kvstore syncs to fusion, in seconds.

7.1.0gauge Number of get operations

7.0.0gauge 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.

7.0.0gauge 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.

7.0.0gauge Frequency of heartbeat interval; in seconds. A heartbeat task is scheduled to provide cleanup and maintenance when magma is idle.

7.1.0gauge / bytes Memory usage for MagmaHistogramStats and file histograms

7.2.0gauge / bytes The logical data size of history

7.2.0gauge / bytes The logical disk size of history

7.2.0gauge / bytes History eviction bytes based on size

7.2.0gauge / bytes History eviction bytes based on time

7.1.0gauge / ratio Proportion of keyIndex (data+index blocks) and seqIndex (index blocks) in memory

7.0.0gauge 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.

7.1.0gauge Number of DocInsert operations

7.0.0gauge 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.

7.0.0gauge 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.

7.2.0gauge Number of compactions triggered by file count for the KeyIndex

7.2.0gauge Number of compaction performed on the writer thread for the KeyIndex

7.1.0gauge / bytes The logical data size, including history

7.1.0gauge / bytes The logical disk size, including history

7.1.0gauge / bytes Memory used by LSMTree objects

7.0.0gauge Maximum # of checkpoints retained for rollback.

7.0.0gauge 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.

7.0.0gauge Maximum time (in seconds) that data is kept in level 0 before it is merged.

7.0.0gauge 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.

7.0.0gauge 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.

7.0.0gauge 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

7.0.0gauge Magma total memory ratio of the Bucket Quota across all shards and Magma limit's it's memory usage to this value.

7.0.0gauge Minimum interval between two checkpoints; in seconds. Prevents excessive creation of checkpoints.

7.0.0gauge 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.

7.0.0gauge Apply Snappy compression to each document when persisted (magma only)

7.1.0gauge / bytes Memory consumed by read ahead buffers. They are used for compactions and sequence iterators. This is included in BufferMemUsed

7.1.0gauge / bytes Total bytes read from disk as per Magma's manual accounting in various code paths

7.1.0gauge / bytes Total bytes read from disk by compactors

7.1.0gauge / bytes Total bytes read from disk by gets

7.1.0gauge / ratio Bytes Read from disk by only Get threads / Bytes outgoing

7.1.0gauge / ratio Bytes read from disk / bytes outgoing. Bytes read from disk includes Gets and compactors (excluding WAL)

7.1.0gauge Number of read IOs performed

7.1.0gauge / ratio Number of read IOs performed by GetDocs divided by the number of GetDocs

7.0.0gauge 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.

7.0.0gauge 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.

7.6.0gauge 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.

7.6.0gauge / 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.

7.6.0gauge / 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.

7.2.0gauge Number of compactions triggered by file count for the SeqIndex

7.2.0gauge Number of compaction performed on the writer thread for the SeqIndex

7.1.0gauge Number of set operations (DocUpsert)

7.0.0gauge 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!

7.1.0gauge Number of fsyncs performed

7.1.0gauge / bytes Memory used by sstable metadata

7.1.0gauge / bytes Memory used by SSTable objects

7.1.0gauge Number of files used for tables

7.1.0gauge Number of table files created

7.1.0gauge Number of table files deleted

7.1.0gauge / bytes Compressed size of all SSTables in all checkpoints, WAL and any other files on disk

7.1.0gauge / bytes Total memory used by bloom filters, write cache, block cache and index blocks This account for all versions of the trees

7.6.0gauge / bytes Memory consumed by all LSMTree TreeSnapshots

7.1.0gauge Number of time-to-live based compactions

7.1.0gauge / bytes Disk usage by the WAL

7.1.0gauge / bytes Total WAL memory used, including WAL buffer and any auxiliary memory

7.1.0gauge / bytes Bytes written by Magma flushes, compactions and WAL writes.

7.1.0gauge / bytes Bytes written by Magma compactions.

7.1.0gauge / bytes Memory usage of the write cache

7.0.0gauge 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.

7.1.0gauge Number of compaction performed on the writer thread

7.0.0gauge 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.

7.0.0gauge maximum number of failover log entries

7.0.0gauge Maximum number of bytes allowed for 'privileged' (system) data for an item in addition to the max_item_size bytes

7.0.0gauge Maximum number of bytes allowed for an item

7.0.0gauge 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).

7.0.0gauge 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.

7.0.0gauge Maximum mumber of shards (0 = auto-configure)

7.0.0gauge Bucket Priority relative to other buckets

7.0.0gauge Memory quota (in bytes) for this bucket.

7.0.0gauge Maximum number of threads of any single class (0 = automatically select based on core count)

7.0.0gauge 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

7.0.0gauge Maximum number of vbuckets expected

7.1.0gauge / bytes Memory recovered from Checkpoint by expelling clean items (i.e. items processed by all cursors) from the queue

7.1.0gauge / bytes Amount of memory freed through ckpt removal

7.0.0gauge The bucket's memory used high watermark.

7.0.0gauge 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.

7.0.0gauge The bucket's memory used low watermark.

7.0.0gauge 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.

7.0.0gauge True if memory usage tracker is enabled

7.0.0gauge What percent of max_data size should we allow the estimated total memory to lag by (EPStats::getEstimatedTotalMemoryUsed)

7.0.0gauge / bytes Estimate of how much metadata has been written to disk since startup

7.0.0gauge / bytes Total memory used by meta data, including the key

7.0.0gauge specifies a minimum compression ratio below which storing the document will be stored as uncompressed.

7.0.0gauge Ratio of the Bucket Quota that can be used before mutations return tmpOOMs

7.0.0gauge 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.

7.0.0gauge Number of times we ran accesss scanner to snapshot working set

7.0.0gauge Number of times accesss scanner task decided not to generate access log

8.0.0counter The total number of CAS value regenerated

7.1.0gauge The number of checkpoint objects allocated

7.6.0counter The number of checkpoint object allocations

7.6.0counter The number of checkpoint object deallocations

7.6.0gauge Number of checkpoints detached from CM and owned by Destroyers

7.0.0counter Number of items that could not be ejected

7.0.0counter Number of times we ran expiry pager loops to purge expired items from memory/disk

7.0.0counter Number of times we ran the freq decayer task because a frequency counter has become saturated

8.0.0counter The total number of invalid CAS values.

7.0.0gauge The number of non-resident items

7.0.0counter Number of times Not My VBucket exception happened during runtime

7.0.0counter Number of times we ran pager loops to seek additional memory

7.0.0counter Number of times item values got ejected from memory to disk

7.0.0gauge Global number of shared worker threads

7.0.0gauge Number of times unrecoverable OOMs happened while processing operations

7.0.0gauge How long in milliseconds the ItemPager will sleep for when not being requested to run

7.0.0gauge Expected number of times the PagingVisitor will check the pause condition per vBucket

7.0.0gauge For persistent buckets, the count of compaction tasks.

8.0.0gauge / seconds The longest time spent in a disk operation that is currently executing

7.0.0gauge Number of ops awaiting pending vbuckets

7.0.0gauge Max ops seen awaiting 1 pending vbucket

7.0.0gauge / seconds Max time (µs) used waiting on pending vbuckets

7.0.0counter Total blocked pending ops since reset

7.0.0gauge Total VB persist state to disk

7.0.0gauge 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.

7.0.0gauge 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.

7.0.0gauge 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.

7.0.0gauge Number of items queued for storage

7.0.0gauge The ratio for calculating how many RangeScans can exist, a ratio of total KVStore scans.

7.0.0gauge The maximum number of range scan tasks that can exist concurrently. Setting to 0 results in num_auxio_threads - 1 tasks

7.0.0gauge The maximum lifetime in seconds for a range-scan. Scans that don't complete before this limit are cancelled

7.0.0gauge 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

7.0.0gauge 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.

7.0.0gauge Number of rollbacks on consumer

8.0.0counter 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.

7.0.0gauge 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.

7.0.0gauge 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.

7.0.0gauge Timeout in seconds after which a pending SeqnoPersistence operation is temp-failed

8.0.0gauge / bytes The number of bytes read when copying/downloading snapshots

7.0.0gauge / seconds System-generated engine startup time

7.0.0gauge The number of storedval objects allocated

7.6.0counter The number of storedval object allocations

7.6.0counter The number of blob object deallocations

7.6.0counter / bytes The total number of bytes ever allocated for storedval objects

7.6.0counter / bytes The total number of bytes ever freed by deallocated storedval objects

7.0.0gauge 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.

7.0.0counter Number of times temporary OOMs happened while processing operations

7.0.0gauge / 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

7.0.0gauge Total number of items de-duplicated when queued to CheckpointManager

7.2.0gauge Total number of items de-duplicated when flushed to disk

7.0.0gauge Total number of persisted deletions

7.0.0gauge Total number of items queued for persistence

7.0.0gauge Total number of persisted new items

7.0.0gauge Total number of items persisted

7.0.0gauge The amount of items that have not been written to disk

7.6.0counter / bytes The total number of bytes ever allocated for blob objects

7.6.0counter / bytes The total number of bytes ever freed by deallocated blob objects

7.0.0gauge Total vBuckets (count)

7.0.0gauge Number of vbucket deletion events

7.0.0gauge / seconds Avg wall time (µs) spent by deleting a vbucket

7.0.0gauge Number of failed vbucket deletion events

7.0.0gauge / seconds Max wall time (µs) spent by deleting a vbucket

7.0.0gauge 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.

7.0.0gauge Is Warmup of existing data enabled

7.0.0gauge AccessLog loading operates in batches of this size (dictates the max number of keys issued to the KVStore::getMulti function)

7.0.0gauge 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.

7.0.0gauge The duration (in ms) after which warmup's backfill scans will yield and re-schedule; allowing other tasks on the same threads to run.

7.0.0gauge 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.

7.0.0gauge Duplicates encountered during warmup

7.1.0counter 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.

7.1.0counter 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.

7.1.0counter Number of keys warmed up

7.0.0gauge OOMs encountered during warmup

7.2.0gauge The current status of the warmup thread

7.0.0gauge / seconds Time (µs) spent by warming data during Primary warm-up

7.1.0counter Number of values warmed up

7.0.0gauge

7.0.0gauge

8.0.0gauge / bytes The rate limit for fusion extent migration, in bytes per second.

8.0.0gauge / bytes The rate limit for fusion sync uploads, in bytes per second.

7.0.0histogram / bytes Item allocation size counters for front-end mutations (in bytes)

7.6.0gauge The number of items currently in transit (with a reference into the engine)

7.0.0gauge The number of times an operation failed due to accessing a locked document

7.6.0gauge / bytes The logical size of all user data on disk (per-bucket), with compression applied

7.6.0gauge / bytes Data written as part of the KV frontend writes.

7.2.0gauge Count of Magma compactions

7.6.0gauge Number of items returned by iterators

7.6.0gauge / bytes Bytes written by Magma flushes, compactions.

7.6.0gauge / bytes Bytes written by Magma compactions due to file count triggers.

7.6.0gauge Maximum number of connections to the interfaces marked as system only

7.6.0gauge Maximum number of connections to the interfaces marked as user

7.0.0gauge / bytes Engine's total memory usage

7.0.0gauge / 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)

7.0.0gauge / bytes The "unused" memory caused by the allocator returning bigger chunks than requested

7.0.0gauge / bytes Memory used for various objects

7.0.0gauge Num of async high priority requests

7.0.0gauge Number of vBuckets

7.0.0counter Number of operations

7.0.0counter Number of operations failed due to conflict resolution

7.0.0gauge / bytes The number bytes received from all connections bound to this bucket

8.0.0counter The number of connections rejected due to hitting the maximum number of connections

7.0.0gauge Num of items rolled back

7.1.0gauge / bytes The memory footprint for tracing times spent processing stat requests

7.0.0gauge / bytes The total number of bytes from the documents being returned as part of subdoc lookup operations

7.0.0gauge / bytes The total size of all documents used for subdoc lookup operations

7.0.0gauge / bytes The total number of bytes inserted into the documents via subdoc

7.0.0gauge / bytes The total number of bytes for the documents mutated via subdoc

7.0.0counter The number of subdoc operations

7.6.0gauge The number of times a subdoc mutation had to be retried as the document was changed by a different actor while performing the operation

7.0.0histogram / seconds Commit duration for SyncWrites

7.0.0gauge The number of connections to system ports in memcached

7.6.2histogram / seconds Per-task histogram of time taken to run a task

7.6.0gauge / seconds Number of seconds the given thread has spent running according to the OS

7.0.0gauge / seconds The servers current time (seconds since January 1st, 1970 at 00:00:00 UTC)

7.0.0counter The total number of connections to this system since the process started (or reset)

7.0.0gauge / bytes Extra memory used by transient data like persistence queue, replication queues, checkpoints, etc

7.0.0gauge / bytes Engine's total memory usage

7.0.0gauge The number of error messages returned

7.0.0gauge / seconds The number of seconds elapsed since process start

7.6.0gauge The number of connections to user ports in memcached

7.0.0gauge Cumulative count of documents auto-deleted due to NRU ejection (Ephemeral Buckets only)

7.1.0gauge / bytes The memory usage in bytes of the per-vBucket Bloom filters

7.0.0gauge / bytes Total memory in checkpoints, sum of kv_vb__checkpoint_memory_overhead_bytes and kv_vb_checkpoint_memory_queue_bytes

7.0.0gauge / bytes Checkpoints memory overhead. That is the sum of kv_vb_checkpoint_memory_overhead_index_bytes and kv_vb_checkpoint_memory_overhead_queue_bytes.

7.1.0gauge / bytes Memory overhead in the checkpoints key-index. For every index entry, that accounts the internal structure allocation plus the key-size.

7.1.0gauge / 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.

7.1.0gauge / 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.

7.0.0gauge Count of alive (non-deleted) items in the vbucket, including non-resident items

7.2.1gauge / bytes The memory usage in bytes of the per-VBucket Durability Monitor (in-progress SyncWrites)

7.2.1gauge The number of items tracked in the per-VBucket Durability Monitor (in-progress SyncWrites)

7.0.0gauge Cumulative count of the number of items whose values have been ejected for this vBucket

7.0.0gauge Cumulative count of the number of items which have been expired for this vBucket

7.2.5gauge The average size (number of slots) of the HashTable across all vbuckets

7.1.0gauge / bytes The memory usage of items stored in the HashTable

7.1.0gauge / bytes The memory usage of items stored in the HashTable, if the values were not compressed

7.2.5gauge The maximum HashTable size (number of slots) across all vbuckets

7.0.0Deprecated in 8.0.0gauge / bytes Memory overhead of the HashTable

8.0.0gauge / bytes Memory overhead of the HashTable

7.0.0gauge Number of purged tombstones (Ephemeral)

7.2.0gauge / bytes The total size of history stored per-vBucket (the largest size reported by any vBucket)

7.1.0gauge / bytes Memory recovered from Checkpoint by expelling clean items (i.e. items processed by all cursors) from the queue

7.1.0gauge / bytes Amount of memory freed through ckpt removal

7.0.0gauge / bytes Estimate of how much metadata has been written to disk since startup

7.0.0gauge / bytes Total memory used by meta data, including the key

7.0.0gauge The number of non-resident items

7.0.0gauge Number of operations where an item has been flushed to disk that did not previously exist

7.0.0gauge Number of operations where a delete has been persisted

7.0.0gauge Number of successful front-end get operations

7.0.0gauge Number of fatal errors in persisting a mutation (including deletion)

7.0.0gauge Number of operations where a new version of an item has been persisted

7.0.0gauge / ratio Percentage of items which are resident in memory

7.0.0gauge / seconds Sum of disk queue item age in seconds

7.0.0gauge Total drained items

7.0.0gauge Total items enqueued on disk queues

7.0.0gauge / bytes Total memory used by the disk queues

7.0.0gauge / bytes Total bytes of pending writes in the disk queue

7.0.0gauge Number of items in the disk queues

7.0.0gauge Total number of mutations discarded during rollback

7.0.0gauge Number of items in the sequence list

7.0.0gauge Number of deleted items in the sequence list

7.0.0gauge Number of tombstones purged from the sequence list

7.0.0gauge Number of sequence numbers visible according to the sequence list read range

7.0.0gauge Number of stale items in the sequence list

7.0.0gauge / bytes Total bytes of stale metadata (key + fixed metadata) in the sequence list

7.0.0gauge / bytes Total bytes of stale values in the sequence list

7.0.0gauge Total number of aborted SyncWrites

7.0.0gauge Total number of accepted SyncWrites (in-progress, aborted or committed)

7.0.0gauge Total number of all committed SyncWrites (includes vb_sync_write_committed_not_durable_count)

8.0.0gauge Total number of SyncWrites which could not be written durably, but were committed because the fallback was enabled (see durability_impossible_fallback)

7.0.0gauge / bytes The number bytes sent to all connections bound to this bucket