Function register_int_gauge_vec_with_subsystem

pub fn register_int_gauge_vec_with_subsystem(
    subsystem: &str,
    name: &str,
    description: &str,
    label_names: &[&str],
) -> IntGaugeVec

Wrapper around Prometheus register_int_gauge_vec! macro with linera namespace and a subsystem. Results in metrics named linera_<subsystem>_<name>.