The Logstash Lines update, dated January 12, 2016, outlines the preparations for the Logstash 2.2 release, highlighting key enhancements and fixes. The team focused on optimizing the default number of pipeline workers to fully utilize all CPU cores, which improved performance in common scenarios like Apache log processing. New features include warnings for overly large batch sizes, updated event documentation, and an API to declare output plugin thread safety. Manageability improvements introduced a bootstrap config file to enhance command line options, and plugin updates included refactoring for Beats Input to fix thread synchronization issues, new settings for File Input to manage file descriptors, and enhancements to ES and Kafka outputs, including SSL support for Kafka. Additionally, JDBC input was improved to allow query run state to be saved using various column types.