It's a term borrowed from assembly lines(0), where if the andon cord is pulled, the entire line stops until some manager or the likes inspects and restarts it. For amazon, the equivalent would be pulling the listing immediately from the website, blocking orders and flagging the item for immediate review.
Ah but not an acronym like SCRAM for example in the early nuclear reactor days. Meaning: Start Cutting Right Away Man, because back then, you had to cut the ropes holding up the control rods, which basically mean, shut it down as fast as possible by dropping those rods.
(0): https://en.wikipedia.org/wiki/Andon_(manufacturing)