This might include ones from https://wikitech.wikimedia.org/wiki/Nova_Resource:Editor-engagement#Instances_for_this_project , and other projects where we've (or prior teams) have created instances.
Please be sure to check with people.
Docs.editor-engagement.eqiad.wmflabs is still in use.
ee-flow and ee-flow-extra have now been backed up and deleted.
I think the only remaining one that definitely needs to be deleted is flow-tests.