It's always a difficult one giving individual feedback and maintaining confidentiality of staff involved in incidents. It would not be appropriate to feedback that a member of staff had been taken down the HR route or been disciplined for example.
In relation to whether it was a "serious" incident one would hope investigators looked at whether the lapse in care/observation-taking caused or contributed to the patient's deterioration. Yes, it was below accepted standards of care but what was result of this. Despite observations not being recorded, was the patient's condition monitored and