#[instrument]Expand description
Instruments a function to create and enter a time-graph span every
time the function is called.
§Examples
Instrumenting a function:
#[instrument]
pub fn my_function(my_arg: usize) {
// ...
}
Overriding the generated span’s name:
#[instrument(name = "another name")]
pub fn my_function() {
// ...
}