Macro prometheus::labels

macro_rules! labels {
    () => { ... };
    ( $ ( $ KEY : expr => $ VALUE : expr , ) + ) => { ... };
}

Create labes with specify name-value pairs.

Examples

let labels = labels!{
    "test" => "hello",
    "foo" => "bar",
};
assert_eq!(labels.len(), 2);
assert!(labels.get("test").is_some());
assert_eq!(*(labels.get("test").unwrap()), "hello");

let labels: HashMap<&str, &str> = labels!{};
assert!(labels.is_empty());