Shows issues spread across multiple boards and shows dependencies.
Could be useful for example to show how Epics are doing across several teams/projects, like so:
(see also my other JIRA-related projects here here here and here)
A healthy issue has no dependencies, or depends on another issue which is on any of the columns (on any of the boards) to its right . An unhealthy issue depends on an issue to the left of it (either on the same board or on another board).