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This is a simple background job (JIRA service), which triggers a transition on all issues, which are found by a certain JQL query.
The Linked Transition Trigger Service post function provides also some functionality to trigger a transition on some issues. Depending on your use case you might use this service or that post function.
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See Atlassian's documentation for more information how to confiugre JIRA services.
You must enter the following value as class.
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In the following screen, you can configure the details of the transition trigger service.
User to run the JQL query and the workflow transition
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