I never use Discover, unless it's to install something KDE specific and I never use it to update. If you are using openSUSE Tumbleweed and want to get rid of Discover Notifier, run this:

sudo zypper rm --clean-deps discover6-notifier

sudo zypper al discover6-notifier

These will uninstall the notifier and lock the package so it isn't installed in the future, which it typically is by default.