I think the updater sensor should receive some upgrades:
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the icon for the Update Available state should be something like mdi:alert-circle-check-outline or mdi:alert-decagram-outline and the Up to date state icon should be the check mark instead
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the notification trough the notifier should be enabled by default and not by adding an automation
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the updater state icon should become yellow/orange if you are not updating in a while (maybe after skipping 3-5 major versions)