Tracing Rust

Use these conventions for instrumenting Rust applications with tokio-rs/tracing. Tracing provides structured, event-based diagnostic information through spans, events, and subscribers.

Source Baseline

• Prefer released docs from docs.rs/tracing, crates.io, and the matching GitHub release.
• Current stable: tracing 0.1.41, tracing-subscriber 0.3.19, tracing-core 0.1.34.
• MSRV: Rust 1.65+.

Cargo.toml

[dependencies]
tracing = "0.1"

# For subscribers and formatting — almost always needed
tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }