The Bamboo GitLab Plugin allow easy links from Atlassian Bamboo to repositories hosted in GitLab.
After installing the plugin, go to the configuration of a Git repository for a build plan. In the Advanced options section, select GitLab as the Web repository. Enter a Web Repository URL and click Save repository. Commits for that plan should now be properly linked.
Over time, the URLs used by GitLab may change. This plugin has currently only been tested with GitLab 5.2.0.