Function tracing_capture::predicates::target

pub fn target<P: IntoTargetPredicate>(
    matches: P,
) -> TargetPredicate<P::Predicate>

Creates a predicate for the target of a CapturedSpan or CapturedEvent.

Arguments

The argument of this function may be:

• &str: will be compared as per standard target filtering. E.g., target("tracing") will match tracing and tracing::predicate targets, but not tracing_capture.
• Any str Predicate. To bypass Rust orphaning rules, the predicate must be enclosed in square brackets (i.e., a one-value array).

Examples

let storage = SharedStorage::default();
let subscriber = Registry::default().with(CaptureLayer::new(&storage));
tracing::subscriber::with_default(subscriber, || {
    tracing::info_span!(target: "capture::test", "compute").in_scope(|| {
        tracing::info!(answer = 42, "done");
    });
});

let storage = storage.lock();
// All of these access the single captured span.
let spans = storage.scan_spans();
let _ = spans.single(&target("capture"));
let _ = spans.single(&target([starts_with("cap")]));