Window 2 on the Cupola module has been hit by a minor MicroMeteoroid and Orbital Debris (MMOD) strike. With the window’s protective shutter closed, per flight rules, ISS managers are evaluating photos of the damage – downlinked from the International Space Station (ISS) – before they are expected to give the crew clearance to reopen the shutter…The window is made up of four panes – an inner scratch pane to protect the pressure pane from accidental damage, two pressure panes 25mm thick to maintain cabin pressure, and finally an outer debris pane. The debris panes can be replaced individually, via EVAs.
It doesn’t look like a serious hit, but that’s why they have the outer window pane for debris strikes. The Cupola is on the nadir side, so it has the Tranquillity node protecting it from most strikes.