The latest_symlink feature added to tracing-appender is creating a symlink pointing to an invalid target.

Here is a simple example that shows the issue:

use tracing_appender::rolling::{RollingFileAppender, Rotation};

fn main() {
    let file_appender = RollingFileAppender::builder()
        .rotation(Rotation::DAILY)
        .filename_prefix("myapp.log")
        .latest_symlink("myapp.log")
        .build("logs")
        .expect("initializing rolling file appender failed");

    tracing_subscriber::fmt().with_writer(file_appender).init();
}

and here is the resulting symlink:

$ cargo run
$ ls -l logs
lrwxrwxrwx 1 aurel aurel 25 30 juin  18:22 myapp.log -> logs/myapp.log.2026-06-30
-rw-rw-r-- 1 aurel aurel  0 30 juin  18:22 myapp.log.2026-06-30

Note that both the log file and the symlink are inside the logs directory but the symlink is pointing to logs/myapp.log.2026-06-30 instead of myapp.log.2026-06-30.

This patch fixes the issue and generate the proper symlink as shown here:

$ cargo run
$ ls -l logs
lrwxrwxrwx 1 aurel aurel 20 30 juin  18:24 myapp.log -> myapp.log.2026-06-30
-rw-rw-r-- 1 aurel aurel  0 30 juin  18:24 myapp.log.2026-06-30