Failing test(s): TestAccComputeSubnetwork_subnetworkInternalL7lbExample and more

[shuyama1]

Failure rates

• 100% since 2023-12-12

Impacted tests

• TestAccComputeSubnetwork_subnetworkInternalL7lbExample
• TestAccComputeForwardingRule_forwardingRuleHttpLbExample
• TestAccComputeForwardingRule_forwardingRuleRegionalHttpXlbExample
• TestAccComputeForwardingRule_internalHttpLbWithMigBackendExample
• TestAccComputeGlobalForwardingRule_globalInternalHttpLbWithMigBackendExample
• TestAccNetworkServicesGateway_minimalSwp
• TestAccNetworkServicesGateway_networkServicesGatewayMultipleSwpSameNetworkExample
• TestAccNetworkServicesGateway_networkServicesGatewaySecureWebProxyExample
• TestAccNetworkServicesGateway_multipleSwpGatewaysDifferentNetwork
• TestAccNetworkServicesGateway_multipleSwpGatewaysDifferentSubnetwork
• TestAccDNSRecordSet_routingPolicy

Affected Resource(s)

• google_compute_subnetwork

Nightly build test history

• Link

Message(s)

vcr_utils.go:152: Step 1/2 error: After applying this test step, the plan was not empty.
        stdout:
        Terraform used the selected providers to generate the following execution
        plan. Resource actions are indicated with the following symbols:
          ~ update in-place
        Terraform will perform the following actions:
          # google_compute_subnetwork.network-for-l7lb will be updated in-place
          ~ resource "google_compute_subnetwork" "network-for-l7lb" {
                id                               = "projects/xxxxxx/regions/us-central1/subnetworks/tf-test-l7lb-test-subnetworkvndk9pmf6z"
              - ipv6_access_type                 = "INTERNAL" -> null
                name                             = "tf-test-l7lb-test-subnetworkvndk9pmf6z"
                # (13 unchanged attributes hidden)
            }
        Plan: 0 to add, 1 to change, 0 to destroy.

b/316686879

[shuyama1]

Looks like the API has started to return value INTERNAL for ipv6_access_type field when it's not explicitly set since 12/12 and this causes a permadiff in Terraform.

[melinath]

This has also been reported a user in #16801 - I've closed it as a duplicate of this issue. Note that trying to set the value to INTERNAL results in the API Error:

Invalid value for field 'resource.ipv6AccessType': 'INTERNAL'. The IPv6 access type of a proxy-only subnet is implicitly set to INTERNAL and is not configurable.

Ideally the API would either let this value be set to INTERNAL (and only INTERNAL if that's the only valid value) or we could try to ignore the diff on the client side with a diff suppress (or customize diff if knowledge of multiple field values is required)

[SarahFrench]

Notes from triage: this could be addressed with a diff suppress func in the provider, or a change to the API. The service team can choose whichever option is most appropriate.

[rileykarson]

Appears to have resolved itself on 2023-12-20 after ~a week.

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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