Analytics - Rollback Rate

**Is your feature request related to a problem? Please describe.**

A metric we would like to provide and graph on the analytics page is Rollback Rate. We can determine the rollback rate in a crude way by looking to see if a specific version was deployed successfully to the same environment twice. It would also be nice to provide the time difference between those events and we can possibly determine mean time to recovery (MTTR).

**Describe the solution you'd like**

Create an analytics route on the api that returns rollback events in the specified timeframe. These events should also include the start/stop time and duration. We should also provide a computed rollback rate as a percentage in the response.

**Describe alternatives you've considered**

None

**Additional context**

None