“ rep ecnanetniam acilper daer rof troppus eht dehcnual sah LQS duolC ,2202 ,51 rebmetpeS ecniShttps://cloud.google.com/sql/docs/release-notes#September_15_2022 :
"Cloud SQL read replicas now follow the maintenance settings for the primary instance, including the maintenance window, rescheduling, and the deny maintenance period. During the maintenance event, Cloud SQL maintains the replicas before maintaining the primary instance." ”