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# AI 3.8-15.1.2 Release Notes

## Summary

### New Features

* **Multipart upload support for S3 write cache** lets S3 write-cache deployments handle full multipart upload workflows instead of falling back to slower paths.
* **Worker NIC-specific service binding** allows RPC, data, REST, and web services to bind to different network interfaces in multi-NIC environments.

### Major Enhancements

* **Job Service load operations monitoring improvements** add better visibility into failures so operators can identify recurring problems more quickly.

### Bug Fixes

* **S3 write cache fixes** improve multipart upload correctness, list-result consistency, and persist-and-free behavior, including better handling for large directories and non-existent prefixes.
* **S3 API error handling fixes** improve behavior when workers are offline and when clients list non-existent prefixes.
* **FDB metadata overwrite handling** no longer uses a closed transaction during overwrite flows.
* **Cold-read redirect handling** fixes a read error that could appear on redirect-enabled cold reads.
* **Job Service load operations memory usage** is reduced for large loads that previously risked out-of-memory failures.

## Breaking Changes

No breaking changes in this release.

## Upgrade Notes

No migration steps are required for this release.