- Fixed cluster unavailability during rolling upgrades, enabling near‑zero‑downtime upgrades with the Kubernetes operator.
- Implemented extensive stability fixes: refined gRPC retries and server‑ID validation, resolved expression parsing and large string‑index serialization issues, and addressed DataNode/DataCoord restart loops and shard/leader view bugs.
- Added minor enhancements such as clearer error messages, disk metric exposure, configurable Pulsar request timeout, and a default MALLOC_CONF environment variable for memory release.