What follows is a question wrapped in a word problem.
Facing an opponent attacking with an undefined, yet non-lethal, number of 1/1 tokens, I block one of them with Seeker of the Way. Once I am able to cast a spell during the Declare Blockers step, I cast Arcbond targeting my Seeker of the Way. (Recognizing Process trigger and lifelink gained.) Combat damage happens.
One damage is dealt to Seeker of the Way, triggering the Arcbond. Seeker of the Way deals 1 damage to each other creature, and each player. Lifelink causes me to gain life for each point of damage dealt.
Now, for the purposes of accounting +1/+1 counters gained by a Ajani's Pridemate, is the damage dealt by Seeker of the Way one blot of damage to the all the creatures, or separate spats of damage done to each creature? Would the Ajani's Pridemate gain one counter, because I've gained life, or multiple counters, because I've gained life multiple times?