A read-only DateAndTime value recording when this alert's fields, such as its severity, were last changed, and left unpopulated for plain events. Because alerts persist and can be re-evaluated over time, this timestamp tells an admin whether they are looking at the alert's original state or a more recent update, distinct from when it was first raised. For example, if an alert's severity dropped from critical to minor as a condition improved, cWNotificationUpdatedTimestamp would show when that downgrade was recorded, separate from the original cWNotificationTimestamp.