Each creature with lifelink dealing combat damage is a single life-gaining event. For example, if two creatures an opponent controls with lifelink deal combat damage at the same time, Kavu Predator's ability will trigger twice. However, if a single creature an opponent controls with lifelink deals combat damage to multiple creatures, players, and/or planeswalkers at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will trigger only once.