Macro prometheus::register_int_gauge_vec

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

Create an IntGaugeVec and registers to default registry.

View docs of register_gauge_vec for examples.