From the README:

Pausing popular torrents isn’t something that qBittorrent handles well. This library uses 2 criteria to pause / stop torrents.

They are stopped if they are:

• Popular (IE have a lot of total seeds), and
• You’ve given back more than what you’ve taken (IE a seed ratio > 1)

Requirements

• Rust
• A qBittorrent server.
• An API key generated through the web UI.
• A crontab where this script can be periodically run.

Usage

This will pause torrents with a ratio >= 2, and more than 10 total seeds.

cargo run -- \
--api-key API_KEY \
--endpoint ENDPOINT \
--ratio 2 \
--total-seeds 10