The GitLab Branch Source Plugin has come out of its beta stage and has been released to the Jenkins update center. It allows you to create job based on GitLab user or group or subgroup project(s). You can either:
Import a single project’s branches as jobs from a GitLab user/group/subgroup (Multibranch Pipeline Job)
Import all or a subset of projects as jobs from a GitLab user/group/subgroup...
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