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Associating a TFS check-in with a JIRA issue is very simple and lightweight. The only thing that you have to do is make an issue key a part of your TFS check-in comment / Git commit message, as shown below.
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If you have properly set up your synchronizer application to perform TFS-JIRA issues synchronization and (in case of JIRA Cloud environment) exposed it to web requests from the internet (see Settings for JIRA Cloud), associating check-ins with JIRA issues is even easier - actually it is fully automatic. All you need to do is associate your check-in with a TFS work item and the symchronizer Synchronizer will take care of the rest - it will find the work item's matching issue and when you open that issue, it will display the changeset.
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