Type Alias Callback

pub type Callback<T> = Box<dyn Fn(&dyn AsyncInstrument<T>) + Send + Sync>;

A function registered with a Meter that makes observations for the instruments it is registered with.

The async instrument parameter is used to record measurement observations for these instruments.

The function needs to complete in a finite amount of time.

Aliased Type

struct Callback<T>(/* private fields */);