For App level Postgres and MySQL resources, previously Convox would create and use custom parameter groups. On creation, these parameter groups are clones of the default parameter groups for the appropriate engine & version of the resource. Once you have updated your Rack to this version, on your next app deploy, the custom parameter group set against your App’s resource will be replaced with the AWS default parameter group. This allows for seamless major version upgrades after this change has been made. If you have amended any parameters within the custom parameter group (directly in the AWS console), these settings would therefore be lost once your App resource switches to the default parameter group.
For App level Postgres and MySQL resources, Major Version Upgrades are now enabled by default.
#3365 Allow major version upgrade and switch to default parameter groups