Tue 15, Oct 2019 macos
This happened lately. I disabled searching for updates on my Mac, because I want to stay on 10.14, but accidentally opened the update preference pane, which then started to search for an update.
Since then, the settings icon in the dock had this red badge indicating, that there's an update available.
That's really distracting, so I tried out many commands to remove it, but none of them worked. One was working in 10.13 and lower only, another one required you to do it before the update was found, ...
But I ended up with this command, which actually worked:
defaults write com.apple.systempreferences AttentionPrefBundleIDs 0 && killall Dock (Source).
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