ScyllaDB release: version 1.5 RC1

ScyllaDB 1.5 RC1, an open-source NoSQL database compatible with Apache Cassandra, has been released, emphasizing stability, bug fixes, and workload conditioning. This release introduces the capability for ScyllaDB to self-tune by automatically reducing request rates when disk speeds are insufficient, ensuring optimal performance. Notable bug fixes address issues like unnecessary parallel queries during range scans, file descriptor retention causing disk space issues, negative cache capacity values, and memory leaks in snapshot operations. New metrics have been added, such as counters for replica writes delayed by excessive unflushed memory and blocked requests in the commitlog write path due to slow disk speeds, while some older metrics have been rendered obsolete by these workload conditioning improvements. The release is not yet production-ready, and further testing is encouraged to help stabilize the version by reporting any encountered bugs.

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