After removing my cluster integration and re-adding it, I attempted to re-install Prometheus (since it didn't list it as "installed"), and it was met with the following error message because it had already been installed previously:  I think a few things should be done here: 1. These "install" actions should work in such a way that it does not fail when run a second time (the process should be idempotent) 2. GitLab should automatically detect when apps already exist in the cluster under the `gitlab-managed-apps` namespace 3. There should be a way to remove apps added via this integration. Currently I need to run `kubectl delete namespace gitlab-managed-apps` manually to reset this. We could put a button next to the "Remove cluster integration" that performs this command to remove the apps. 4. Removing a GitLab cluster integration should automatically remove the apps it had installed (or prompt the user with an option to do so) /cc @joshlambert