Hello!
This was the response we had got for the same query raised
The 5 GB limit is for the license filter spillover queue - this comes into play if the Event Collector is receiving more raw events than it is licensed for.
There is a separate on-disk queue used when the EC cannot reach the downstream EP. That queue will basically fill until there is no disk space left - it actually stops at 93% or 95% or something like that, but as opposed to the license spillover it is effectively unbounded. When the EP comes back up, all the events will be sent at that time.
https://www.ibm.com/support/pages/qradar-event-and-flow-burst-handling-buffer
T&R
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