🛈 Note: This is pre-release documentation for the upcoming tracing 0.2.0 ecosystem.

For the release documentation, please see docs.rs, instead.

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Structured data associated with Spans and Events.

Structs

A Value which serializes as a string using fmt::Debug.

A Value which serializes using fmt::Display.

An empty field.

An opaque key allowing O(1) access to a field in a Span’s key-value data.

Describes the fields present on a span.

An iterator over a set of fields.

A set of fields and values for a span.

Traits

Trait implemented to allow a type to be used as a field key.

A field value of an erased type.

Visits typed values.

Functions

Wraps a type implementing fmt::Debug as a Value that can be recorded using its Debug implementation.

Wraps a type implementing fmt::Display as a Value that can be recorded using its Display implementation.