We highly recommend that you upgrade if you are currently using v2.1.0. If you are running a previous version of Graylog, check out our 2.1 GA announcement (https://graylog.org/blog/68-announcing-graylog-v2-1-0-ga) to see
Graylog 2.1.0 introduces many new features such as message decorators and pluggable authentication. We also have made improvements to the product based on your feedback. Thank you for helping us
