Crate

tracing-subscriber

Composable subscribers for the tracing instrumentation framework.

What it is

tracing-subscriber provides pre-built implementations for consuming tracing events: a formatting layer for human-readable or JSON output, filter layers controlled via RUST_LOG, and a Registry for composing multiple layers into a single subscriber.

Why it is commonly used

The standard companion to the tracing crate. Used at application startup to configure how tracing events are formatted, filtered, and exported. Most Rust services call tracing_subscriber::init() once in main() and rely on it for all log output.

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