What happens when you keep adding to a streaming dataset with historical records turned on > 5mil

Hi all,

Quick question. I got a simple streaming dataset setup with historic data analysis turned on so it'll keep a record of everytime I send data to the stream. I've then got the setup where the stream is receiving data from an API.

I understand that the stream can store records up to 5 million rows. My question is what happens when it goes over the 5 million rows? Does it just start deleting the oldest records to make room for the new records being added?