Does the damage bonus from Heavy Weapon Master apply to each attack that hits in a round?

I knew about Heavy Armor Master or Great Weapon Master, but not this one :( Which book is it from?

Or is this feat from a homebrew page like this one? If so, it seems you can apply the bonus damage to all the hits in the round.

Heavy Weapons Master
Prerequisites: Strength 13
You have mastered the use of heavy weapons on the field of battle. As a result, you receive the following benefits:

• When making an attack with a melee weapon that has the heavy property, you score a critical hit if the d20 shows a 19 or 20.
• Each time you successfully hit a creature with a weapon that has the heavy property, you deal bonus damage of the weapon's damage type equal to half of your Strength modifier (rounded up).