Gitlab 5.1 发布了，该版本有诸多改进和性能上的提升，比较重要的4个改进是：
Important upgrade note
We’ve fixed some bugs in the diff view for merge requests. Merge requests that were closed before the upgrade will display “Nothing to merge” after the upgrade. This can’t be prevented, please make sure you don’t need to revisit any closed merge requests before upgrading. Open merge requests are not affected, they will display the correct diff view.