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.

Re-exports

• pub use self::targets::Targets;
  std or alloc

Modules

• combinatorregistry and std
  Filter combinators
• targetsstd or alloc
  A filter that enables or disables spans and events based on their target and level.

Structs

• BadFieldNameenv-filter and std
  Indicates that a field name specified in a filter directive was invalid.
• Builderenv-filter and std
  A builder for constructing new EnvFilters.
• Directiveenv-filter and std
  A single filtering directive.
• 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.
• EnvFilterenv-filter and std
  A Layer which filters spans and events based on a set of filter directives.
• FilterFn
  A filter implemented by a closure or function pointer that determines whether a given span or event is enabled, based on its Metadata.
• FilterIdregistry and std
  Uniquely identifies an individual Filter instance in the context of a Subscriber.
• Filteredregistry and std
  A Layer that wraps an inner Layer and adds a Filter which controls what spans and events are enabled for that layer.
• FromEnvErrorenv-filter and std
  Indicates that an error occurred while parsing a EnvFilter from an environment variable.
• LevelFilter
  A filter comparable to a verbosity Level.
• LevelParseError
  Indicates that a string could not be parsed to a valid level.
• ParseErrorstd or alloc
  Indicates that a string could not be parsed as a filtering directive.

Traits

• FilterExtregistry and std
  Extension trait adding combinators for combining Filter.

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.