Core primitives for tracing.
tracing is a framework for instrumenting Rust programs to collect
structured, event-based diagnostic information. This crate defines the core
primitives of tracing.
The crate provides:
[Span] identifies a span within the execution of a program.
[Event] represents a single event within a trace.
[Subscriber], the trait implemented to collect trace data.
[Metadata] and [Callsite] provide information describing Spans.
[Field], [FieldSet], [Value], and [ValueSet] represent the
structured data attached to a Span.
[Dispatch] allows span events to be dispatched to Subscribers.
In addition, it defines the global callsite registry and per-thread current dispatcher which other components of the tracing system rely on.
Application authors will typically not use this crate directly. Instead, they
will use the [tracing] crate, which provides a much more fully-featured
API. However, this crate's API will change very infrequently, so it may be used
when dependencies must be very stable.
This project is licensed under the MIT license.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tokio by you, shall be licensed as MIT, without any additional terms or conditions.