If I understand PRTG clustering properly, each node has an exact copy of the master node's sensor configurations. What happens then with xFlow or packet collection sensors configured on the master node? If the master node is collecting its own packets, do the failover nodes also need to be collecting packets? How about for netflow exported from a router? Does the netflow exporter need to send the same flows to all nodes in the cluster? What happens on the fail over node if it has an xFlow sensor configured but does not receive flow data?