I upgraded two instances (libressl) last week from 21.7.4 to 21.7.5 and both of them rebooted fine even if it took a long time until all services were shutdown. Today I searched for updates again got 21.7.5_2 presented without any further notice. After installation the machine rebooted immediately. Luckily it happened in our maintenance timeframe but I was quite surprised seeing the machine rebooting without warning.