It’s just the ellipsis. No period. The ellipsis counts as the end of sentence marker, if indicating a pause in speech; if indicating an elision, then surrounded by a space on either side.
Of course I’m just making this up! Our old editor back when I was a tech writer said, “There are several rules for different types of punctuation. At the beginning of a new project we will pick one and stick with it, and I will make your life a living hell when you violate it.” (Okay, she never said that last part. Out loud. But this was someone who could pick out a bold period in a page of unbolded text, using naked eyeballs alone, and she had turned her OCD into a weapon to be feared. Awesome editor, though.)