Alternatives

Recipe	Crates	Categories
log
slog
log4rs
env_logger
OpenTelemetry	OpenTelemetry Rust documentation⮳
OpenObserve	OpenObserve⮳

Use older alternatives to tracing

tracing is now the "go-to" crate for logging, but log, slog and log4rs are still in extensive use.

log

log is an older and simpler crate, if your needs are simple and you are not using any async code.

slog

Structured, extensible, composable logging. slog remains a stable, featureful and battle-tested library, used in many important projects.

fn main() {
    todo!();
}

log4rs

log4rs is a highly configurable multi-output logging implementation for the log facade.

use log::{error, info, warn};
use log4rs;

fn main() {
    log4rs::init_file("config/log4rs.yaml", Default::default()).unwrap();

    info!("booting up");

    // ...
}

env_logger

A logging implementation for log which is configured via an environment variable. env_logger makes sense when used in executables (binary projects). Libraries should use the log crate instead.

use log::info;

fn main() {
    env_logger::init();

    info!("starting up");

    // ...
}

Other frameworks

OpenTelemetry

OpenTelemetry Rust documentation⮳

fn main() {
    todo!();
}

OpenObserve

OpenObserve⮳ (written in Rust) is a petabyte-scale Elasticsearch/Splunk/Datadog alternative for logs, metrics, traces, RUM, error tracking, and session replay.

fn main() {
    todo!();
}