Function run_service_status_probe 

async fn run_service_status_probe(
    service_status: Arc<Mutex<Option<ServiceIssue>>>,
    update_tx: UpdateFanout,
    prober: Box<dyn Fn() -> Pin<Box<dyn Future<Output = Option<ServiceIssue>> + Send>> + Send + Sync>,
)

The statuspage probe, off the boot path. Its answer is held before it is announced, so a view that attaches afterwards reads it rather than having missed the one update that carried it.