The "paused" event is part of BEP 21. Clients send it to the tracker to let it know that the client is still incomplete, but won't download anymore. For example

The "paused" event is part of BEP 21. Clients send it to the tracker to let it know that the client is still incomplete, but won't download anymore. For example, because a user only wants some files from the torrent. Readme of the project shows that support for BEP 21 is not implemented.