Struct MetricTracker 

pub struct MetricTracker { /* private fields */ }

Per-metric ring buffer history tracker.

Implementations

impl MetricTracker

pub fn new(capacity: usize) -> Self

Create a new metric tracker with the given capacity per metric.

pub fn record(&mut self, sample: MetricSample)

Record a metric sample.

pub fn history(&self, kind: MetricKind) -> Option<&VecDeque<MetricSample>>

Get the history for a metric kind (oldest first).

pub fn latest(&self, kind: MetricKind) -> Option<&MetricSample>

Get the most recent sample for a metric kind.

pub fn sample_count(&self, kind: MetricKind) -> usize

Get the number of samples for a metric kind.

pub fn tracked_kinds(&self) -> impl Iterator<Item = MetricKind> + '_

Iterate over metric kinds that have at least one sample.

pub fn tracked_count(&self) -> usize

Number of metrics with at least one sample.

pub fn ewma(&self, kind: MetricKind, alpha: f32) -> Option<f32>

Compute the EWMA (exponentially weighted moving average) for a metric.

pub fn slope(&self, kind: MetricKind) -> Option<f32>

Compute the linear slope (rate of change) for a metric. Returns the slope per sample (positive = increasing).