ScyllaDB release: version 1.2.3

ScyllaDB 1.2.3 is a bugfix release from the ScyllaDB team, building on the stable 1.2 branch, and it maintains backward compatibility while supporting rolling upgrades. The update addresses several critical issues, including a bug in the SSTable statistics API that could lead to crashes, a flaw in the Bloom Filter implementation affecting very large SSTables, and a problem where dropping a keyspace with numerous tables might never complete. Additionally, a bug in the io_tune setup step could result in a crash on certain storage configurations. Contributors to this release include Avi Kivity, Duarte Nunes, Gleb Natapov, Pekka Enberg, and Tomasz Grabiec, who have made various fixes and improvements to enhance the reliability and performance of ScyllaDB.