FYI, coming in 1.021:
* Now armadas in fleets of a race or a formal ally in docking range of a planet/outpost, despite not actually being in the planet/outpost's list of defense armadas, will count as defending that planet/outpost (and be displayed as orbiting it, as long as they're there).
* Races will now sometimes send fleets to help defend the planets of their formal allies.
* The Defending-Armada-Count and Defending-Armada-Power figures on the under-the-planet solar map overlay now include a breakdown of who exactly that count and power is coming from, similar to the attacker breakdowns on the enemy figures.