prometheus::register_histogram_vec

macro_rules! register_histogram_vec {
    ( $ OPTS : expr , $ LABELS_NAMES : expr ) => { ... };
    ( $ NAME : expr , $ HELP : expr , $ LABELS_NAMES : expr ) => { ... };
    ( $ NAME : expr , $ HELP : expr , $ CONST_LABELS : expr , $ LABELS_NAMES : expr ) => { ... };
}

Create a HistogramVec and register to default registry.

Examples

let opts = histogram_opts!("test_macro_histogram_vec_1",
                           "help",
                           labels!{"test" => "hello", "foo" => "bar",});

let histogram_vec = register_histogram_vec!(opts, &["a", "b"]);
assert!(histogram_vec.is_ok());

let histogram_vec =
    register_histogram_vec!("test_macro_histogram_vec_2", "help", &["a", "b"]);
assert!(histogram_vec.is_ok());

let histogram_vec = register_histogram_vec!("test_macro_histogram_vec_3",
                                            "help",
                                            labels!{"test" => "hello", "foo" => "bar",},
                                            &["a", "b"]);
assert!(histogram_vec.is_ok());