Function logfile_layer

fn logfile_layer<S>(
    config: &LogfileConfig,
    granularity: Duration,
    mistrust: &Mistrust,
    path_resolver: &CfgPathResolver,
) -> Result<(impl Layer<S> + Send + Sync + Sized, WorkerGuard)>
where
    S: Subscriber + for<'span> LookupSpan<'span> + Send + Sync,

Try to construct a non-blocking tracing [Layer] for writing data to an optionally rotating logfile.

On success, return that layer, along with a WorkerGuard that needs to be dropped when the program exits, to flush buffered messages.