Automatic cleaner tool for your mediaserver (eg. Plex). Making use of a history-tracker (eg. Tautulli) and a request-tracker (eg. Ombi) to keep in mind requested and watched status, to make sure media gets only deleted when everyone who wanted to watch it, has watched it.
Why do you think that https://github.com/Prowlarr/Prowlarr is a good alternative to Cleanarr