Add a rollback info dashboard
Test dashboard: https://dashboards.gitlab.net/dashboard/snapshot/g21vyuy0EEUAG8Uk79brC0bBIC6Jry4C
The dashboard currently has 1 row, showing the percentage of deployments per environment that are "rollbackable".
The goal of this dashboard is to increase visibility into rollbacks, and to increase confidence in our ability to perform rollbacks.
Edited by Reuben Pereira