If using a custom elastic image with Bamboo, then, when you upgrade Bamboo, you also need to upgrade the agent on the image, build a new image etc. What would be great is if the old elastic agent could detect this, and do the upgrade automatically, ie download the agent jar from the Bamboo server, install it and then run it. This would make for a much better user experience with custom elastic images.

This is an issue when using remote agents as well, with the 100 user license: customers have to now upgrade 100 remote agents with each server upgrade.