Aria Operations for Logs 8.18.x
Aria Operations for Logs stores logs in buckets. To delete logs in the bucket, the bucket containing the logs needs to be sealed and archived.
However, the sealing process only starts once the bucket has reached its maximum size of 512 MB.
Therefore, if the bucket size is less than 512 MB, it cannot be deleted, even if it contains logs that are older than the retention period settings.
This is expected behavior.
The logs cannot be deleted before the bucket which stores the logs reaches the maximum size.
For more information about buckets, see Key Aspects of the Event Life Cycle