The alert PEGA0082 gets comes in pega-alert file whenever a data flow starts or resumes.
Many Out of the box agents have been converted to Queue Processor in latest versions and these QPs use Data Flows internally. So whenever the concerned node is restarted then this message is expected.
If these alerts are coming too frequently even though the nodes has not been restarted or the QP has not been restarted manually then for some reason the Data flows are going into pause state or stop state and then going to starting state. So in this scenario you can debug why this is happening or you can take help from Pega Support team to debug.