Module field

Structured data associated with Spans and Events.

Structs

DebugValue

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

DisplayValue

A Value which serializes using fmt::Display.

Empty

An empty field.

Field

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

FieldSet

Describes the fields present on a span.

Iter

An iterator over a set of fields.

ValueSet

A set of fields and values for a span.

Traits

AsField

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

Value

A field value of an erased type.

Visit

Visits typed values.

Functions

debug

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

display

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