• Major changes to concurrency and locking control to address numerous issues in concurrent environments.
• Drop support for Ruby 1.8
• statsd.time now always sends results, even with exceptions or returns from the given blocks
• Add IPv6 support
• Fix numerous issues with JRuby, after IPv6 support was added
• Add TCP support
• Add Admin API support
• Support custom delimiters
• Removed JSON gem dependencies, rubies now ship a json library