The best German private trackers where it is relatively easy to get an invited are probably TN and IM. They don’t get many releases as fast as the top tier trackers but an active requests board. And yeah Content on public trackers is basically nonexistent. For automation and little work Usenet indexers like scenenzbs are a good route as well

What are your reasons for using docker swarm instead normal docker if you don’t want to do replication?