How to Configure Jenkins for Git Merge?

Issue

I am using the functionality that automatically merge branch from Jenkins (Git Plugin and/or CloudBees Git Validated Merge plugin)
When doing the merge/push my build fail a stacktrace similar to:

 Caused by: hudson.plugins.git.GitException: Command "/usr/bin/git merge ..." returned status code 128:
 stdout:
 stderr:
 *** Please tell me who you are.
 Run
 git config --global user.email "you@example.com"
 git config --global user.name "Your Name"
 to set your account's default identity.
 Omit --global to set the identity only in this repository.
 fatal: empty ident <jenkins@localhost> not allowed

Environment

CloudBees Jenkins Enterprise
Jenkins
Git Plugin
CloudBees Git Validated Merge plugin

Resolution

When doing a push, git needs user information to be able to push anything. This can be configured in Jenkins either Globally or per Project.

Global Configuration

In the global configuration under Manage Jenkins Configure System Git Plugin:

Project Configuration

In the project configuration, under Source Code Management Git Additional Behaviours, you can add the behaviour Custom user name/email address:

Validate Merge Access Control (For Validate Merge Plugin only)#

When using validate merge, you can specify which user/credentials to use for logging to the remote host. For example, you can use*Username/Password credentials and specify your GitHub API Token as password:

For more information, please review CloudBees Git Validated Merge plugin