Auto Balanced Collector Groups need a rework
Currently, if a collector goes down the devices it was monitoring will only failover to other collectors in the group if doing so does not put them over the defined Rebalance Threshold on the ABCG....
Forum Discussion
@SeanC ABCG should not prevent failover even when the target collector is/would be above the rebalance threshold. If you're seeing this behavior I suggest reaching out to support to see if they can help you out.