Struct LevelPredicate 

pub struct LevelPredicate { /* private fields */ }

Default predicate: enables everything at or below the current LevelFilter setting (including OFF for “disable everything”).

The level is dynamic — call LevelPredicate::handle to grab a cheap-to-clone LevelHandle that can change it from another thread/task at runtime without rebuilding the subscriber. Every callsite_enabled returns Sometimes so tracing-core re-asks enabled on each event/span, picking up live changes immediately; LevelHandle::set additionally calls tracing::callsite::rebuild_interest_cache so any callsites that were registered before the level changed get re-evaluated against the new max_level_hint.

Implementations

impl LevelPredicate

pub fn new(level: Level) -> Self

Construct from a tracing::Level (legacy callers). See with_filter for the LevelFilter form that can also express OFF.

pub fn with_filter(filter: LevelFilter) -> Self

Construct from a LevelFilter (the only way to start OFF).

pub fn handle(&self) -> LevelHandle

A cheap-to-clone handle that sets/gets the current level from other threads/tasks — typically held by an admin RPC.

Trait Implementations

impl EnabledPredicate for LevelPredicate

fn max_level_hint(&self) -> Option<LevelFilter>

fn callsite_enabled(&self, metadata: &'static Metadata<'static>) -> Interest

fn enabled(&self, metadata: &Metadata<'_>) -> bool

fn new_span_enabled(&self, span: &Attributes<'_>) -> bool