You can use environment variables, build parameters, or a variable expanded by the token macro plugin.

Additionally, the following variables are also available:

• $mrTitle - merge request title
• $mrAbbrTitle - merge request title truncated to 30 chars
• $mrUrl - merge request url
• $mrId - merge request id
• $jobName - jenkins job name
• $buildStatus - build status (available only if build is completed)
• $buildUrl - build url
• $assemblaSourceSpaceId - assembla space id
• $assemblaDescription - merge request description
• $assemblaSourceRepositoryUrl - assembla repository url
• $assemblaTargetBranch - merge request target branch
• $assemblaSourceBranch - merge request source branch
• $assemblaMergeRequestId - assembla merge request id
• $assemblaRefName - build git revision