Struct SamplingLayer 

pub struct SamplingLayer<S, N = DefaultFields, E = Format<Full>, W: for<'a> MakeWriter<'a> = fn() -> Stderr> { /* private fields */ }

A tracing_subscriber::Layer that samples events into time-bucketed reservoirs.

Uses tracing_subscriber::fmt::Layer internally for event formatting. Sampled events are smeared across the bucket duration to reduce tail-latency spikes from burst writes.

Construct via SamplingLayer::builder().

Implementations

impl<S> SamplingLayer<S>

pub fn builder() -> SamplingLayerBuilder<S>

Create a new SamplingLayerBuilder with default settings.

impl<S, N, E, W: for<'a> MakeWriter<'a>> SamplingLayer<S, N, E, W>

pub fn flush(&self)

Drain all reservoirs and write their contents immediately.

Trait Implementations

impl<S, N, E, W: for<'a> MakeWriter<'a>> Drop for SamplingLayer<S, N, E, W>

fn drop(&mut self)

Executes the destructor for this type.

impl<S, N, E, W> Layer<S> for SamplingLayer<S, N, E, W>

where S: Subscriber + for<'a> LookupSpan<'a>, N: for<'writer> FormatFields<'writer> + 'static, E: FormatEvent<S, N> + 'static, W: for<'a> MakeWriter<'a> + 'static,

fn register_callsite(&self, meta: &'static Metadata<'static>) -> Interest

Registers a new callsite with this layer, returning whether or not the layer is interested in being notified about the callsite, similarly to Subscriber::register_callsite.

fn enabled(&self, meta: &Metadata<'_>, ctx: Context<'_, S>) -> bool

Returns true if this layer is interested in a span or event with the given metadata in the current Context, similarly to Subscriber::enabled.

fn on_event(&self, event: &Event<'_>, ctx: Context<'_, S>)

Notifies this layer that an event has occurred.

fn on_new_span(&self, attrs: &Attributes<'_>, id: &Id, ctx: Context<'_, S>)

Notifies this layer that a new span was constructed with the given Attributes and Id.

fn on_record(&self, id: &Id, values: &Record<'_>, ctx: Context<'_, S>)

Notifies this layer that a span with the given Id recorded the given values.

fn on_enter(&self, id: &Id, ctx: Context<'_, S>)

Notifies this layer that a span with the given ID was entered.

fn on_exit(&self, id: &Id, ctx: Context<'_, S>)

Notifies this layer that the span with the given ID was exited.

fn on_close(&self, id: Id, ctx: Context<'_, S>)

Notifies this layer that the span with the given ID has been closed.

fn on_register_dispatch(&self, subscriber: &Dispatch)

Performs late initialization when installing this layer as a Subscriber.

fn on_layer(&mut self, subscriber: &mut S)

Performs late initialization when attaching a Layer to a Subscriber.

fn on_follows_from(&self, _span: &Id, _follows: &Id, _ctx: Context<'_, S>)

Notifies this layer that a span with the ID span recorded that it follows from the span with the ID follows.

fn event_enabled(&self, _event: &Event<'_>, _ctx: Context<'_, S>) -> bool

Called before on_event, to determine if on_event should be called.

fn on_id_change(&self, _old: &Id, _new: &Id, _ctx: Context<'_, S>)

Notifies this layer that a span ID has been cloned, and that the subscriber returned a different ID.

fn and_then<L>(self, layer: L) -> Layered<L, Self, S>

where L: Layer<S>, Self: Sized,

Composes this layer around the given Layer, returning a Layered struct implementing Layer.

fn with_subscriber(self, inner: S) -> Layered<Self, S>

where Self: Sized,

Composes this Layer with the given Subscriber, returning a Layered struct that implements Subscriber.

fn with_filter<F>(self, filter: F) -> Filtered<Self, F, S>

where Self: Sized, F: Filter<S>,

Combines self with a Filter, returning a Filtered layer.

fn boxed(self) -> Box<dyn Layer<S> + Send + Sync>

where Self: Sized + Layer<S> + Send + Sync + 'static, S: Subscriber,

Erases the type of this Layer, returning a Boxed dyn Layer trait object.