Unique ID in the instrument macro?

[szymek156]

Hello, I have an async function like this:

#[instrument]
async fn task1() {
    for i in 0..10 {
        info!(i, "hello from task 1");
        tokio::time::sleep(Duration::from_millis(10)).await;
    }
}

when launching two tasks like so:

let h = tokio::spawn(task1());
let h2 = tokio::spawn(task1());

I cannot distinguish from the output which trace belongs to which task:

2022-09-07T08:26:45.644888Z  INFO task1: tracing_testo: hello from task 1 i=7
2022-09-07T08:26:45.656212Z  INFO task1: tracing_testo: hello from task 1 i=8
2022-09-07T08:26:45.656212Z  INFO task1: tracing_testo: hello from task 1 i=8
2022-09-07T08:26:45.667520Z  INFO task1: tracing_testo: hello from task 1 i=9
2022-09-07T08:26:45.667546Z  INFO task1: tracing_testo: hello from task 1 i=9

So what I did is to add an UID field:

fn uid() -> u16 {
    static CNT: AtomicU16 = AtomicU16::new(0);
    CNT.fetch_add(1, std::sync::atomic::Ordering::Relaxed)
}

#[instrument(fields(uid=uid()))]
async fn task1() {
    for i in 0..10 {
        info!(i, "hello from task 1");
        tokio::time::sleep(Duration::from_millis(10)).await;
    }
}

And now I see {uid=0} or {uid=1} that helps me to distiguish between tasks:

2022-09-07T08:28:52.761808Z  INFO task1{uid=0}: tracing_testo: hello from task 1 i=8
2022-09-07T08:28:52.761809Z  INFO task1{uid=1}: tracing_testo: hello from task 1 i=8
2022-09-07T08:28:52.773155Z  INFO task1{uid=0}: tracing_testo: hello from task 1 i=9
2022-09-07T08:28:52.773130Z  INFO task1{uid=1}: tracing_testo: hello from task 1 i=9

My question is: Is it the proper way of doing it? Did I miss some functionality from #[instrument] macro, or other place?