Would be nice to have some new distinctive visuals inside the citadel hangars when the citadel is reinforced. For example it could be alarm lights, holo messages with warnings or repeating voice messages. There can be different visuals for armor and hull reinforcements.
Pros:
Very clear way to indicate that citadel has been reinforced for the pilots logging in inside
Consistent logic that millions of citadel “locals” should be alarmed