Struct SqliteExporter 

pub struct SqliteExporter { /* private fields */ }

Exports metrics by storing them in an SQLite database at a periodic interval

Implementations

impl SqliteExporter

pub fn new<P: AsRef<Path>>( flush_interval: Duration, keep_duration: Option<Duration>, path: P, ) -> Result<Self>

Creates a new SqliteExporter that stores metrics in an SQLite database file.

flush_interval specifies how often metrics are flushed to SQLite/disk

keep_duration specifies how long data is kept. Initial cleanup runs on the worker, and supplies the default retention for periodic housekeeping. Opening, migration, and the integrity check still run on the caller.

pub fn set_periodic_housekeeping( &self, periodic_duration: Option<Duration>, retention: Option<Duration>, record_limit: Option<usize>, )

Sets optional periodic housekeeping, None to disable (disabled by default)

Notes

Periodic housekeeping can affect metric recording, causing some data to be dropped during housekeeping. Exceeding the record limit removes the excess plus 25% of the limit. retention: None uses the keep_duration supplied to new(). With housekeeping enabled, successful inserts also trigger cleanup after 1,000–100,000 rows (scaled to the record limit), at most once per second. Deletes run in batches between events. Large amounts of free space may trigger a full VACUUM on the worker, with attempts at most once per hour. Disabling periodic housekeeping cancels its pending batches. Startup cleanup continues independently using the constructor’s retention policy.

pub fn install(self) -> Result<SqliteExporterHandle, SetRecorderError<Self>>

Install recorder as metrics crate’s Recorder

Trait Implementations

impl Drop for SqliteExporter

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl Recorder for SqliteExporter

fn describe_counter( &self, key: KeyName, unit: Option<Unit>, description: SharedString, )

Describes a counter.

fn describe_gauge( &self, key: KeyName, unit: Option<Unit>, description: SharedString, )

Describes a gauge.

fn describe_histogram( &self, key: KeyName, unit: Option<Unit>, description: SharedString, )

Describes a histogram.

fn register_counter(&self, key: &Key, _metadata: &Metadata<'_>) -> Counter

Registers a counter.

fn register_gauge(&self, key: &Key, _metadata: &Metadata<'_>) -> Gauge

Registers a gauge.

fn register_histogram(&self, key: &Key, _metadata: &Metadata<'_>) -> Histogram

Registers a histogram.