GitLab: Editing the merge request description triggers a merge request hook being sent

Under triggers (Settings -> integrations) perform the below:

1. Enable push events (optional branch name - Branch is created via push events even before MR is possible)
2. Enable MR event triggers in your project repo

This URL will be triggered when a merge request is created/updated/merged

In Jenkins Plugin configuration -

1. Check "Push Events" (Any commits by way of direct Push or Creation)
2. Un-check "Opened Merge Request Events"
3. Check "Accepted Merge Request Events" (Any commits by way of Merge Request)