Module tracing_subscriber::filter

Layers that control which spans and events are enabled by the wrapped subscriber.

This module contains a number of types that provide implementations of various strategies for filtering which spans and events are enabled. For details on filtering spans and events using Layers, see the layer module’s documentation.

Structs

• DynFilterFn
  A filter implemented by a closure or function pointer that determines whether a given span or event is enabled dynamically, potentially based on the current span context.
• FilterFn
  A filter implemented by a closure or function pointer that determines whether a given span or event is enabled, based on its Metadata.
• LevelFilter
  A filter comparable to a verbosity Level.
• LevelParseError
  Indicates that a string could not be parsed to a valid level.

Functions

• dynamic_filter_fn
  Constructs a DynFilterFn from a function or closure that returns true if a span or event should be enabled within a particular span context.
• filter_fn
  Constructs a FilterFn, from a function or closure that returns true if a span or event should be enabled, based on its Metadata.