Macro prometheus::register_histogram

macro_rules! register_histogram {
    ( $ NAME : expr , $ HELP : expr ) => { ... };
    ( $ NAME : expr , $ HELP : expr , $ BUCKETS : expr ) => { ... };
    ( $ HOPTS : expr ) => { ... };
}

Create a Histogram and register to default registry.

Examples

let opts = histogram_opts!("test_macro_histogram", "help");
let res1 = register_histogram!(opts);
assert!(res1.is_ok());

let res2 = register_histogram!("test_macro_histogram_2", "help");
assert!(res2.is_ok());

let res3 = register_histogram!("test_macro_histogram_4",
                                "help",
                                vec![1.0, 2.0]);
assert!(res3.is_ok());