Currently, you can't tell from the tray icon whether a restart is needed for the available updates. The icon always shows a circular arrow surrounding the big up-arrow. This circular arrow iconography is used in the "reboot system" icon, so it's a bit conflated here. What if we split it into two icons: * Updates available: just an up-arrow (or up-arrow with closed circle surrounding it) * Updates available and reboot required: up-arrow with circular arrow surrounding it That way, you can tell at a glance whether a restart is needed, and you can infer whether changes will take effect immediately or only after restart, increasing predictability in behavior. This info may also be important to users when deciding whether to update right away or wait until later.
Oh wait, to be clear: I mean to indicate a required restart in Discover's icon itself *even before* installation. I know we have a separate icon (that said, do some distros not use it?) for indicating a restart is required after installation. However I think that one could also be combined into Discover's circled-up-arrow icon rather than being separate. Hope this makes sense?