title: Nexus3: What happened to number to keep task cleanup functionality
body: <p>In Nexus 2.14, we had a task to cleanup a repo but to keep the last 20; Number to keep. In Nexus 3, we are able to cleanup older than the last 30 days, but it's important to us to keep at least the last 20 builds. Is there a new way to do this I don't see in Nexus OSS 3.2.1?</p>