View Gitlab Hook on the plugin site for more information.
The current version of this plugin may not be safe to use. Please review the following warnings before use:
Enables Gitlab web hooks to be used to trigger SMC polling on Gitlab projects
But, with a large number of projects that are mostly polling (no hooks), the project might actually be built with a great delay (5 to 20 minutes).
You can find more details about notifyCommit and this issue here.