Jenkins job builder gitlab trigger is ignored

I have a following Jenkins Job definition:

- scm:
  name: some-project
  scm:
    - git:
      url: git@gitlab.****/some-project.git
      credentials-id: some-ssh-username-with-private-key
      branches:
        - origin/master
- project:
    name: some-project
    jobs:
      - '{name}':
        triggers:
          gitlab:
            trigger-push: true
            trigger-merge-request: false
            trigger-open-merge-request-push: never

Now this job can be uploaded to Jenkins without error but if I go to Configure page of some-project in Jenkins Web UI, I can see that Build when a change is pushed to GitLab in Triggers section is not enabled. GitLab repo gets configured correctly - Source Code Management section of this job has git@gitlab.****/some-project.git with some-ssh-username-with-private-key credentials and branch origin/master configured. But without working triggers this is useless.

What am I doing wrong?

Please note that I'm not asking how to configure GitLab WebHooks to trigger Jenkins job. I can do this manually and it works fine. But we want to manage our Jenkins jobs with Jenkins Job builder to avoid error prone process of configuring them via Web UI and to keep track of changes in job configuration - we are creating git repository with Jenkins job definitions.

I suspect you may need to put the triggers in the job itself, rather than under /project/jobs.

With the triggers under the project key, I experience the same symptom you do. None of my triggers get created in Jenkins. Moving the triggers section into a job fixes the problem for me.

This yaml will build a jenkins job called builder-test with the "Build when a change is pushed to GitLab" box checked:

- scm:
    name: gitlab
    scm:
      - git:
          url: https://gitlab.com/user/repo-name.git
          branches:
            - origin/master
- job:
    name: builder-test
    project-type: freestyle
    description: "builder-test desc"
    scm:
      - gitlab            
    triggers:
      - gitlab: 
          trigger-push: true
- project:
    name: builder-test-project
    jobs:
      - 'builder-test'

Tested on Jenkins 2.32.3 using GitLab plugin 1.5.1 and JJB 1.6.2