Key | Default | Type | Description
--- | --- | --- | ---

##### state.backend.forst.metrics.actual-delayed-write-rate

false

Boolean

Monitor the current actual delayed write rate. 0 means no delay.

##### state.backend.forst.metrics.background-errors

false

Boolean

Monitor the number of background errors in ForSt.

##### state.backend.forst.metrics.block-cache-capacity

false

Boolean

Monitor block cache capacity.

##### state.backend.forst.metrics.block-cache-hit

false

Boolean

Monitor the total count of block cache hit in ForSt (BLOCK_CACHE_HIT == BLOCK_CACHE_INDEX_HIT + BLOCK_CACHE_FILTER_HIT + BLOCK_CACHE_DATA_HIT).

##### state.backend.forst.metrics.block-cache-miss

false

Boolean

Monitor the total count of block cache misses in ForSt (BLOCK_CACHE_MISS == BLOCK_CACHE_INDEX_MISS + BLOCK_CACHE_FILTER_MISS + BLOCK_CACHE_DATA_MISS).

##### state.backend.forst.metrics.block-cache-pinned-usage

false

Boolean

Monitor the memory size for the entries being pinned in block cache.

##### state.backend.forst.metrics.block-cache-usage

false

Boolean

Monitor the memory size for the entries residing in block cache.

##### state.backend.forst.metrics.bloom-filter-full-positive

false

Boolean

Monitor the total count of reads not avoided by bloom full filter.

##### state.backend.forst.metrics.bloom-filter-full-true-positive

false

Boolean

Monitor the total count of reads not avoided by bloom full filter and the data actually exists in ForSt.

##### state.backend.forst.metrics.bloom-filter-useful

false

Boolean

Monitor the total count of reads avoided by bloom filter.

##### state.backend.forst.metrics.bytes-read

false

Boolean

Monitor the number of uncompressed bytes read (from memtables/cache/sst) from Get() operation in ForSt.

##### state.backend.forst.metrics.bytes-written

false

Boolean

Monitor the number of uncompressed bytes written by DB::{Put(), Delete(), Merge(), Write()} operations, which does not include the compaction written bytes, in ForSt.

##### state.backend.forst.metrics.column-family-as-variable

false

Boolean

Whether to expose the column family as a variable for ForSt property based metrics.

##### state.backend.forst.metrics.compaction-pending

false

Boolean

Track pending compactions in ForSt. Returns 1 if a compaction is pending, 0 otherwise.

##### state.backend.forst.metrics.compaction-read-bytes

false

Boolean

Monitor the bytes read during compaction in ForSt.

##### state.backend.forst.metrics.compaction-write-bytes

false

Boolean

Monitor the bytes written during compaction in ForSt.

##### state.backend.forst.metrics.cur-size-active-mem-table

false

Boolean

Monitor the approximate size of the active memtable in bytes.

##### state.backend.forst.metrics.cur-size-all-mem-tables

false

Boolean

Monitor the approximate size of the active and unflushed immutable memtables in bytes.

##### state.backend.forst.metrics.estimate-live-data-size

false

Boolean

Estimate of the amount of live data in bytes (usually smaller than sst files size due to space amplification).

##### state.backend.forst.metrics.estimate-num-keys

false

Boolean

Estimate the number of keys in ForSt.

##### state.backend.forst.metrics.estimate-pending-compaction-bytes

false

Boolean

Estimated total number of bytes compaction needed to rewrite to get all levels down to under target size. Not valid for other compactions than level-based.

##### state.backend.forst.metrics.estimate-table-readers-mem

false

Boolean

Estimate the memory used for reading SST tables, excluding memory used in block cache (e.g. filter and index blocks) in bytes.

##### state.backend.forst.metrics.is-write-stopped

false

Boolean

Track whether write has been stopped in ForSt. The metric will return 1 if write has been stopped, 0 otherwise.

##### state.backend.forst.metrics.iter-bytes-read

false

Boolean

Monitor the number of uncompressed bytes read (from memtables/cache/sst) from an iterator operation in ForSt.

##### state.backend.forst.metrics.live-sst-files-size

false

Boolean

Monitor the total size (bytes) of all SST files belonging to the latest version. WARNING: may slow down online queries if there are too many files.

##### state.backend.forst.metrics.mem-table-flush-pending

false

Boolean

Monitor the number of pending memtable flushes in ForSt.

##### state.backend.forst.metrics.num-deletes-active-mem-table

false

Boolean

Monitor the total number of delete entries in the active memtable.

##### state.backend.forst.metrics.num-deletes-imm-mem-tables

false

Boolean

Monitor the total number of delete entries in the unflushed immutable memtables.

##### state.backend.forst.metrics.num-entries-active-mem-table

false

Boolean

Monitor the total number of entries in the active memtable.

##### state.backend.forst.metrics.num-entries-imm-mem-tables

false

Boolean

Monitor the total number of entries in the unflushed immutable memtables.

##### state.backend.forst.metrics.num-files-at-level

false

Boolean

Monitor the number of files at each level.

##### state.backend.forst.metrics.num-immutable-mem-table

false

Boolean

Monitor the number of immutable memtables in ForSt.

##### state.backend.forst.metrics.num-live-versions

false

Boolean

Monitor number of live versions. Version is an internal data structure. See ForSt file version_set.h for details. More live versions often mean more SST files are held from being deleted, by iterators or unfinished compactions.

##### state.backend.forst.metrics.num-running-compactions

false

Boolean

Monitor the number of currently running compactions.

##### state.backend.forst.metrics.num-running-flushes

false

Boolean

Monitor the number of currently running flushes.

##### state.backend.forst.metrics.num-snapshots

false

Boolean

Monitor the number of unfinished snapshots of the ForSt.

##### state.backend.forst.metrics.size-all-mem-tables

false

Boolean

Monitor the approximate size of the active, unflushed immutable, and pinned immutable memtables in bytes.

##### state.backend.forst.metrics.stall-micros

false

Boolean

Monitor the writer wait duration for compaction or flush to finish in ForSt.

##### state.backend.forst.metrics.total-sst-files-size

false

Boolean

Monitor the total size (bytes) of all SST files of all versions. WARNING: may slow down online queries if there are too many files.