You don't have any information about where the customer was on the cattle/pet divide, nor if the general advice to "treat servers as cattle" even makes sense in

You don't have any information about where the customer was on the cattle/pet divide, nor if the general advice to "treat servers as cattle" even makes sense in their case. Regardless, the whole point of the exercise was to find the root cause and prevent it from happening in the future. Sometimes you gotta dig in and do the work.