Communicating need to reboot and offline updates feedback

[Aleix Pol]

Hi,
I have a couple of bug reports that I'm not sure how to implement in
plasma, so I decided to ask plasma to see what's the best approach.

We need to notify the user about 2 instances:
a) Reboot is required [1]
b) After an offline update (i.e. we scheduled updates to happen at
reboot) some updates failed for reasons. We need to show the error
message to the user. [2]

Where should we put this information?
I've seen a) in status notifiers in the past (e.g. on kubuntu) but I'm
not sure it's explicit enough.
b) could be both a notification (preferably persistent although I'm
not sure we allow them ATM) or a status notifier that the user may
(not) click on it, which would open Discover and allow to try again or
whatever.

Does anyone have a better/different idea?
Aleix

[1] https://bugs.kde.org/show_bug.cgi?id=387211
[2] https://bugs.kde.org/show_bug.cgi?id=386715