Right now Jenkins JIRA plugin has ability to parse commit logs for JIRA issues that are then linked to JIRA. Our workflow is based on per-branch approach, where we create separate branch for each JIRA issue, so the information about issue in this case is not in commit log but in branch name. This makes it impossible for JIRA plugin to know about the issue this build relates to.

In release builds where several branches are merged into one this is not a problem because Stash pushes all issue keys (PROJ-1, PROJ-2 etc.) into a single commit log I think, but for building development branches where we don't put issue key into a commit message this makes it problematic to link JIRA with Jenkins.