Each tracker has different states:
This indicates the tracker is working.
This indicates the tracker is off-line or the torrent is stopped.
This indicates the tracker is updating.
If the tracker reports how many seeds and peers are available then this will be shown along with the time till the next announce.
Trackers are scraped for statistics periodically by Koinonein.
Clicking this will show you a menu that allows you to sort the list of trackers.
Clicking this allows you to add a new tracker to the torrent or to bulk manage the existing trackers.
At the top of the Add Tracker dialog is your list of saved trackers that you can use to add to the selected torrent.
You can download a list of working trackers from here, each tracker on the list has been checked to be working and active in the last 30 minutes.
Every time you add a new tracker to a torrent or when you add a new tracker when creating a torrent that tracker is saved to your saved tracker list.
You can merge your saved trackers to the torrent trackers and delete the saved trackers or paste a list of trackers to the saved trackers.
At the bottom of the Add Tracker dialog is the list of trackers on the selected torrent, from here you can add a new tracker or manage the existing list of trackers.
Clicking this will delete the selected tracker.
Clicking this will re-announce the torrent to the tracker.
Clicking this will scrape the tracker for updated statistics.
Clicking this will open the Tracker Manager.