While I also would love to hear what you have planned and what failed (I would have worded it differently though), even if you did plan for this, 48h notice and

While I also would love to hear what you have planned and what failed (I would have worded it differently though), even if you did plan for this, 48h notice and that on a holiday season sounds absurd and may not even be enough for "just changing a config and testing the system through". It's mean and you shouldn't feel too bad.