TL;DR This is Phase 8 of the FSx for ONTAP S3 Access Points serverless pattern library. Building on Phase 7 , Phase 8 delivers: Operational hardening : a Python-based cleanup_generic_ucs.py that handles Athena WorkGroup, S3 versioned buckets, and VPC Endpoint SG inbound rules end-to-end, replacing the bash script that was tripping over three distinct failure modes in Phase 7 cleanup OutputWriter.put_stream API for artifacts over 5 GB using S3 MultipartUpload with abort-on-failure — single-part S3 PutObject has a 5 GB limit, and Phase 8 adds multipart support to unlock future VFX render, raw FASTQ, and large GeoTIFF outputs Pattern C → Pattern B migration completion : UC6/UC7/UC8 complete the handler-side Pattern B+C hybrid migration — Athena stays on STANDARD_S3 (AWS spec constraint), while AI/ML output handlers now use OutputWriter.from_env() and are ready for FSXN_S3AP routing; UC9/UC13/UC14 complete full Pattern B migration VPC Endpoint SG automation via Custom Resource — no more manual inbound rule edits…