I think that's snail damage, maybe slugs too. Look underneath the leaves, you may find them lurking there, or hiding out under other plants, between pots in shady places. They come out at night and rasp holes in your sedum leaves with their rough mouth parts.
I would get some coarse grit and mulch under and around your sedums with this - the slugs and snails won't like it - and it will last much longer than any pellets which have to be renewed every time it rains.
Those sedums will be gorgeous when they burst into fllower in a little while, and butterflies and bees will love them. You won't notice the holes in the leaves then 