Sentinel deletes the data types in their listed order until the required space is available.
All partitions (both primary storage and secondary storage) are deleted as soon as the keep at most time limit of their retention policy is reached.
Partitions that are successfully moved to secondary storage. The oldest partition is deleted first until none are left or until the desired amount of space is available.
Partitions that are not yet moved to secondary storage, but have reached their retention policy's keep at most time limit. The partitions that are close to the keep at most limit are deleted first, until none are left or until the desired amount of space is available.
If at least half of the desired space is not yet free, partitions are deleted early, on the assumption that incoming data is more important than old data.
Partitions that are not yet moved to secondary storage that have reached their retention policy's keep at most time limit. The partitions that are close to the keep at most limit are moved first, until none are left or at least half of the desired amount of space is available, but the current UTC day partitions are not deleted.