I left 18 months ago, so my memory is a bit fuzzy, but there was at least an overall style guide, one for each post type (e.g. a launch announcement), and the style for procedures (inherited from AWS Docs).
As a non-Amazonian I've never seen it, of course.
PS: you might get tripped up on 0x00, 0x2F, or similar control characters? As i recall any valid octet can be included in a label. We definitely saw literal ‘*’ and ‘.’ inside labels. And I wouldnt be surprised to find a bell in there either.