Percona is glad to announce the release of Percona Toolkit 2.2.8 on June 4th, 2014 (Downloads are available here and from the Percona Software Repositories). This release is the current GA (Generally Available) stable release in the 2.2 series.
variable which was removed in MySQL 5.6.
All Percona software is free and open-source. Details of the release can be found in the release notes and the 2.2.8 milestone at Launchpad. Bugs can be reported on the Percona Toolkit launchpad bug tracker.