We are experiencing some times, that after a GitHub PR is created, the corresponding Jenkins CI is not started (using GitHub Organization Folder).

In such a case we see this in the multibranch event log:

    Checking pull request #2742
Waiting for GitHub to create a merge commit for pull request 2742.  Retrying 4 more times...
Waiting for GitHub to create a merge commit for pull request 2742.  Retrying 3 more times...
Waiting for GitHub to create a merge commit for pull request 2742.  Retrying 2 more times...
      ‘Jenkinsfile’ not found
    Does not meet criteria

We assume that if Jenkins would wait a little bit longer or retry some more times, it would get the merge commit and the job would start. Because if we redeliver the GitHub event for the PR creation, the build is scheduled.

So we would like to have the[ sleep time and/or number of retries|https://github.com/jenkinsci/github-branch-source-plugin/blob/master/src/main/java/org/jenkinsci/plugins/github_branch_source/GitHubSCMSource.java#L1687] be made configurable.