The map icon for a keep will go into “Under Attack” status if any door, wall, or LifeNet Generator gets attacked. It should stay in “Under Attack” mode as long as any of those targets have player aggro on them (this can potentially last for several minutes after the target is no longer being attacked). Also if a door or wall is destroyed, the “Under Attack” status will remain for as long as the keep is open and vulnerable to being lost (because anyone can run inside now that there’s no door/wall). The icon will just say “Under Attack” during this time. The countdown “timer” will only show up if the actual flag for the keep is being contested.