There have been questions in the community on how to find the size of your instances, so I want to share this to save others some time.
For London and later releases: as an admin logged into the instance navigate to Instance Usage > Application Usage Overview and scroll down to Additional Metrics > Primary DB size (MB).
For versions Kingston (and before): create a Hi ticket for "Instance Size Info Request" , as the metric is not available but the Hi techs can see the database and get you the info fairly quickly.
