tog
> I think it'd be useful for the server to somehow indicate that we need to > run "signal-event post-upgrade; signal-event reboot" after an update.
It usually does do that if you are using the server manager panel to update your server, so if you are not seeing that behaviour please report it as a bug.
> I wish the web admin page for the updates had the option to
> call "signal-event post-upgrade; signal-event reboot" after the update.
Again it usually proceeds to do that automatically after upgrades via the server manager panel. Look at the end of the page after updates appear to have finished. Please report as a bug if it is not doing so for you.
Alternatively the option is available under the Administration/Reboot or shutdown panel,
select the Reconfigure option, which then runs those commands.