"nine 9s" comes from Erlang (or in this case BEAM): https://stackoverflow.com/questions/8426897/erlangs-99-9999999-nine-nines-reliability https://stackoverflow.

"nine 9s" comes from Erlang (or in this case BEAM): https://stackoverflow.com/questions/8426897/erlangs-99-9999999-nine-nines-reliability https://stackoverflow.com/questions/8426897/erlangs-99-99999...