tracing-core

Core primitives for application-level tracing.

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Overview

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.

License

This project is licensed under the MIT license.

Contribution

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.