how to cleanup the pvcs? as we use s3, why is the pvc storage filled up, any way to redo/reclaim/clear?

There is no support for Only S3 right now. Currently, S3 is only supported for cold storage. Scenerio: Let's say we are keeping data in disk/PVC for 7 days and retaining for total of 14 days. If you query for 3 days, data will be queried from disk. If you query for last 10 days, data from both disk and S3 would be aggregated.