InfluxDB v0.9.0 is a significant release with improvements in clustering, tags, and enhancements to the API. The new clustering design uses a Streaming Raft implementation optimized for high availability, allowing clusters to sustain single server failures. Tags are added to support metadata about measurements, enabling features like discovery and fast query performance. The API will undergo cleanup and changes, including the removal of Shard Spaces and introduction of Retention Policies. A new storage engine, BoltDB, is implemented, which reduces CPU consumption, improves performance on queries, and simplifies hot database backups and other operations. The release is built using pure Go code, making it easier to build and contribute to core. Early testing will be available, and a migration tool will be provided for users to migrate their data from the previous version.