Starting with Dynatrace Operator version 0.8.0+, a priorityClass object is created by default when installing the Dynatrace Operator. This priority class is initially set to a high value to ensure that the components that use it have a higher priority than other pods, and that critical components like the CSI driver are scheduled by Kubernetes. For details, see the Kubernetes documentation on PriorityClass.
You can change the default value of this parameter according to your environment and the individual use of priority classes within your cluster. Be aware that lowering the default value might impact the scheduling of the pods created by Dynatrace. priorityClass is used on the CSI driver pods by default, but it can also be used on OneAgent pods (see the priorityClassName parameter in DynaKube parameters).