Struct Metrics 

pub struct Metrics { /* private fields */ }

Runtime metrics

Are not stored durably, so metrics will reset after a restart/crash.

Implementations

impl Metrics

pub fn cache_stats(&self, size_bytes: u64, capacity_bytes: u64) -> CacheStats

Builds a CacheStats snapshot from the cumulative cache counters and the caller-supplied live cache size_bytes / capacity_bytes (the block cache owns its occupancy, Metrics owns the hit / miss tallies).

pub fn table_file_cache_hit_rate(&self) -> f64

Returns the cache hit rate for file descriptors in percent (0.0 - 1.0).

pub fn data_block_io(&self) -> u64

Number of I/O data block bytes transferred from disk or OS page cache.

pub fn index_block_io(&self) -> u64

Number of I/O index block bytes transferred from disk or OS page cache.

pub fn filter_block_io(&self) -> u64

Number of I/O filter block bytes transferred from disk or OS page cache.

pub fn range_tombstone_block_io(&self) -> u64

Number of I/O range tombstone block bytes transferred from disk or OS page cache.

pub fn block_io(&self) -> u64

Number of I/O block bytes transferred from disk or OS page cache.

pub fn data_block_load_count(&self) -> usize

Number of data blocks that were accessed.

pub fn index_block_load_count(&self) -> usize

Number of index blocks that were accessed.

pub fn filter_block_load_count(&self) -> usize

Number of filter blocks that were accessed.

pub fn range_tombstone_block_load_count(&self) -> usize

Number of range tombstone blocks that were accessed.

pub fn ecc_auto_heal_scheduled_count(&self) -> usize

Number of SSTs scheduled for a healing recompaction after a persistent ECC correction on read (auto_heal enabled).

pub fn ecc_secded_corrected_count(&self) -> usize

On-read blocks healed by the SEC-DED single-bit fast path.

pub fn ecc_shard_recovered_count(&self) -> usize

On-read blocks recovered from Reed-Solomon shard parity.

pub fn ecc_recovered_count(&self) -> usize

Total on-read ECC recoveries across both mechanisms (SEC-DED + RS shard). A scrapeable latent-bit-rot signal: growth here means the medium is returning faulty bytes that parity is silently repairing.

pub fn block_load_io_count(&self) -> usize

Number of blocks that were loaded from disk or OS page cache.

pub fn data_block_load_cached_count(&self) -> usize

Number of data blocks that were served from block cache.

pub fn index_block_load_cached_count(&self) -> usize

Number of index blocks that were served from block cache.

pub fn filter_block_load_cached_count(&self) -> usize

Number of filter blocks that were served from block cache.

pub fn range_tombstone_block_load_cached_count(&self) -> usize

Number of range tombstone blocks that were served from block cache.

pub fn block_load_cached_count(&self) -> usize

Number of blocks that were served from block cache.

pub fn block_loads(&self) -> usize

Number of blocks that were accessed.

pub fn data_block_cache_hit_rate(&self) -> f64

Data block cache efficiency in percent (0.0 - 1.0).

pub fn filter_block_cache_hit_rate(&self) -> f64

Filter block cache efficiency in percent (0.0 - 1.0).

pub fn index_block_cache_hit_rate(&self) -> f64

Index block cache efficiency in percent (0.0 - 1.0).

pub fn range_tombstone_block_cache_hit_rate(&self) -> f64

Range tombstone block cache efficiency in percent (0.0 - 1.0).

pub fn block_cache_hit_rate(&self) -> f64

Block cache efficiency in percent (0.0 - 1.0).

pub fn filter_efficiency(&self) -> f64

Filter efficiency in percent (0.0 - 1.0).

Represents the ratio of I/O operations avoided due to filter.

pub fn filter_queries(&self) -> usize

Number of filter queries performed.

pub fn io_skipped_by_filter(&self) -> usize

Number of I/O operations skipped by filter.

pub fn prefix_bloom_skips(&self) -> usize

Number of segments skipped during Tree::create_prefix scans by prefix bloom filters (single-table and multi-table run paths).

Note: BlobTree prefix scans do not currently record this metric.

Trait Implementations

impl Debug for Metrics

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Metrics

fn default() -> Metrics

Returns the “default value” for a type.