poorly documented maintenance
Those are all qualified as out of the ordinary. Anything in excess (on either side of the scale, whether it is too much or not enough) is a problem. Of course maintenance must be performed, but I guess some data centers have a strange idea of best practices, or they do not follow them.
Give a man a fish, and you feed him for a day. Teach a man to fish, and he'll invite himself over for dinner. - Calvin Keegan