pub fn duration<'a>( category: &'static CStr, name: &'static CStr, args: &'a [Arg<'_>] ) -> DurationScope<'a>
Writes a duration event which ends when the current scope exits, or the
end method is manually called.
Durations describe work which is happening synchronously on one thread. They can be nested to represent a control flow stack.
0 to 15 arguments can be associated with the event, each of which is used to annotate the duration with additional information.