Function spawn_named_tracked_task 

pub fn spawn_named_tracked_task<F, T>(
    name: &'static str,
    fut: F,
) -> JoinHandle<T> 
where
    F: Future<Output = T> + Send + 'static,
    T: Send + 'static,

spawn_tracked_task with a name that a drain timeout can print.

The name is a short static string describing the task, never a formatted or caller-supplied value: it is read by an operator staring at a shutdown that would not finish, so it is a label for a call site, not a record of one occurrence.