The basic metre is couplets of Iambic Tetrameter, but each line is broken in half (so the Iambic Tetrameter couplets are presented as quatrains). There is copious substitution of equivalent feet, especially in lines 3 and 7.
Most readers would consider that line one has two Iambic feet.
Different readers would have different ideas about how many feet are in line three. The best analysis would say that there are two dactyls in this line, with an excrescent final stress.
Poor readers would give line three, three or even four feet.