Function init_logger 

pub fn init_logger<P: AsRef<Path>>(
    config_path: Option<P>,
) -> (WorkerGuard, LogConfig)

Initializes the global logger.

Reads the logging configuration (level, file name, formatting booleans and time format) directly from a TOML file located at config_path. If the file does not exist or cannot be parsed, sensible defaults are used.

Writing a Lib? Only use the tracing crate and its macros (info!, span!). Do not initialize anything. Writing a Binary? Use tracing-subscriber to build the registry and handlers. Missing dependency logs? Check your EnvFilter string rules and ensure the “log” feature is enabled on tracing-subscriber to catch legacy logs Returns a WorkerGuard that must be kept alive to ensure logs are flushed to the file. If later wanna do rsyslog (libc): https://docs.rs/syslog-tracing/0.3.1/syslog_tracing/struct.Syslog.html Or the newcomer full rust: https://crates.io/crates/tracing-rfc-5424