You can use any env variables or build parameters, additionally plugin provides the following variables:
- $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