Context:
As discussed in the kickoff to the history cleanup in the context of event based proces data it was identified that it would be useful to allow the user to configure the cleanup in the UI directly on the event based process.
https://confluence.camunda.com/pages/viewpage.action?spaceKey=CO&title=Definitions

This is due to the key being dynamically generated and not easy to obtain for the admin. Furthermore event processes can get added dynamically by a dedicated user group which may not have access to the environment-configuration. Thus a way to configure it through the UI would be desirable.