Struct metrics_sqlite::MetricsDb

pub struct MetricsDb { /* private fields */ }

Metrics database, useful for querying stored metrics

Implementations

impl MetricsDb

pub fn new<P: AsRef<Path>>(path: P) -> Result<Self>

Creates a new metrics DB with given path of a SQLite database

pub fn sessions(&self) -> Vec<Session>

Returns sessions in database, based on SESSION_TIME_GAP_THRESHOLD

pub fn available_keys(&mut self) -> Result<Vec<String>>

Returns list of metrics keys stored in the database

pub fn metrics_for_key( &mut self, key_name: &str, session: Option<&Session> ) -> Result<Vec<Metric>>

Returns all metrics for given key in ascending timestamp order

pub fn deriv_metrics_for_key( &mut self, key_name: &str, session: Option<&Session> ) -> Result<Vec<DerivMetric>>

Returns rate of change, the derivative, of the given metrics key’s values

f(t) = (x(t + 1) - x(t)) / ((t+1) - (t)