Jenkins starts Duplicate builds from same commit Multibranch pipeline

Question

We're seeing multiple builds of our Jenkins multi-branch pipeline being triggered by the same merge commit in Bitbucket.

One build is marked triggered by a: "Branch event at "

The other by a: "commit notification "

We have our Jenkins urls setup in a plugin

Bitbucket Server Webhook to Jenkins

and have a our trigger in the Jenkinsfile setup as follows:

triggers {
    pollSCM ""
    cron "H 0 * * *"
}

There seem to be a couple of old questions that unfortunately don't have concrete answers.

Answer 1

We were using Bitbucket with Jenkins integration and had this issue. Our problem was that on the Bitbucket webhook we had selected notifications from push and from PR. This configuration created a Job with the branch name and a second job called PR-XXX when the PR was created.

Maybe this is the reason?