What does this feature do?
Add a new tab to the timeline view of a project, allowing for a visual representation of the activity that has taken place for easier consumption of the data.
This could be something as simple as a created vs closed time chart. Example below:
This might be better suited for a new metrics-style page.
What makes this feature interesting?
As mentioned here, the page itself is rather boring and just a wall of text.
By breaking this information out into a simple visual, it can provide managers (or even users) a nice at-a-glance view of how things are going.
While I think more "involved" charts (burn-up or burn-down) are probably better suited for a more full-featured "project management" suite or a plugin, something simple and straightforward like this seems suited and well-fitting for a pure ticket tracking system.
Additionally, it may be novel to have, in addition to a sliding window of ticket activity, to also maintain either one or two pie charts with regards to the breakdown (defect, feature, enhancement, task, or even 'custom' types) of ticket type.
If using two charts, one chart could be for closed tickets and one chart for open tickets. If using a single chart, it should simply contain everything.
These graphs should be project-specific. When this ticket is implemented, adding installation-level charts would be a plus.