ScyllaDB release: version 1.6 RC1

ScyllaDB 1.6 RC1 marks the release of the first Release Candidate for ScyllaDB 1.6, focusing on stability and bug fixes while introducing new features like experimental Debian support and upgradable Amazon Machine Images (AMIs). As an open-source, Apache-Cassandra-compatible NoSQL database known for superior performance and low latency, ScyllaDB 1.6 introduces changes to its metrics format, requiring users to update their monitoring dashboards accordingly. The release also addresses notable bug fixes, such as improving data streaming used in repairs, reducing bloom filter overhead, and resolving issues related to disk space and system performance under heavy load. Users are encouraged to report any bugs to help stabilize the release, with the note that only the last two minor releases will be supported once 1.6 is officially out.