Type Alias BoxedTelemetryLayer 

pub type BoxedTelemetryLayer<S> = Box<dyn Layer<S> + Sync + Send>;

Type-erased layer compatible with any tracing registry that supports LookupSpan. Boxing is what lets the disabled and enabled paths return the same shape — the caller composes it onto a subscriber via .with(layer) without seeing the underlying generic parameters.

Aliased Type

pub struct BoxedTelemetryLayer<S>(/* private fields */);