Stunning Strike reads like the following paragraph:
"Starting at 5th level, you can interfere with the flow of ki in an opponent’s body. When you hit another creature with a melee weapon attack, you can spend 1 ki point to attempt a stunning strike. The target must succeed on a Constitution saving throw or be stunned until the end of your next turn."
My question is, do Martial Arts count as Melee Weapons for the purpose of determining this effect? Or should the Monk be attacking with a weapon?
The confusion isn't cleared when reading the Martial Arts section, since it seems to separate Melee Weapons from Unarmed Strikes:
"You can roll a d4 in place o f the normal damage of your unarmed strike or monk weapon. This die changes as you gain monk levels, as shown in the Martial Arts column of the Monk table."
So, is it possible?