Constant MAX_AGE_MONITORS 

pub const MAX_AGE_MONITORS: usize = crate::config::MAX_AGE_MONITORS; // 8usize

Max AGE-monitored subscriptions per executor – the second table, on its own knob (NROS_EXECUTOR_MAX_AGE_MONITORS, derived from age_rows) so an image with rate contracts and no age contracts pays for one table only.