Google Provides Extended Support for Cloud SQL MySQL and PostgreSQL End-of-Life Versions
Briefly

The extended support period ensures critical security patches and bug fixes for MySQL and PostgreSQL versions beyond standard support, aiding in smooth operations and secure databases without immediate upgrades.
Customers opting in for extended support will receive three years of support for a major version, after which if not upgraded, the instance will be marked as deprecated and eventually automatically upgraded to a newer version.
Read at InfoQ
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