Besides the per-server release notes you can let one of your channels follow Defendr's own announcement channel. Discord then mirrors the announcements into your channel with no further setup.
You need the Manage Webhooks permission in the channel that should follow. If Defendr replies that announcements are not available yet, the support server has not published its announcement channel; the per-server release notes keep working either way.
Example
/setup › Logs & Updates › Follow announcements