Terraform: Make private Cloud DNS GA

[modular-magician]

/cc @drebes

[gburiola]

Hey @rileykarson

when I upgraded from 2.3.0 to 2.4.0 I noticed that terraform tries to recreate all my google_dns_managed_zone.

-/+ google_dns_managed_zone.myzone-com (new resource required)
      id:             "myzone-com" => <computed> (forces new resource)
      description:    "DNS zone for myzone.com" => "DNS zone for myzone.com"
      dns_name:       "myzone.com." => "myzone.com."
      name:           "myzone-com" => "myzone-com"
      name_servers.#: "4" => <computed>
      project:        "my-project" => <computed>
      visibility:     "" => "public" (forces new resource)

That's because the new visibility field changes from empty to public.

The final resource would still be created correctly, but destroying and recreating managed DNS zones could have a big impact on prod projects.

Is there any chance we could make this change backwards compatible and avoid the resource recreation?

[gburiola]

I just noticed there's already an issue related to this:
#3435

[ghost]

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