init tracing

tracing.rs

use tracing_appender;
use tracing_error::ErrorLayer;
use tracing_subscriber::{self, fmt, prelude::*, registry::Registry};

pub fn init_tracing(directory: &str, file_name: &str) -> tracing_appender::non_blocking::WorkerGuard {
    let file_appender = tracing_appender::rolling::hourly(directory, file_name);
    let (non_blocking, guard) = tracing_appender::non_blocking(file_appender);

    let file_log =
        fmt::layer().with_ansi(false).with_thread_names(true).with_line_number(true).with_writer(non_blocking).pretty();
    let console = fmt::layer().with_writer(std::io::stdout).with_line_number(true).pretty();
    let error_layer = ErrorLayer::default();
    Registry::default().with(console).with(file_log).with(error_layer).init();

    guard
}

How do I set the logging level?

use tracing_appender;
use tracing_error::ErrorLayer;
use tracing_subscriber::{self, filter::LevelFilter, fmt, prelude::*, registry::Registry};

pub fn init_tracing(
    directory: &str, file_name: &str, level: LevelFilter,
) -> tracing_appender::non_blocking::WorkerGuard {
    let file_appender = tracing_appender::rolling::hourly(directory, file_name);
    let (non_blocking, guard) = tracing_appender::non_blocking(file_appender);

    let file_log = fmt::layer()
        .with_ansi(false)
        .with_thread_names(true)
        .with_line_number(true)
        .with_writer(non_blocking)
        .pretty()
        .with_filter(level);
    let console = fmt::layer().with_writer(std::io::stdout).with_line_number(true).pretty().with_filter(level);
    let error_layer = ErrorLayer::default().with_filter(level);
    Registry::default().with(console).with(file_log).with(error_layer).init();

    guard
}

It works now.