Send 0 values for client_ttl and default_ttl in backend service

[roaks3]

Send 0 values for cdn_policy.client_ttl and cdn_policy.default_ttl in google_compute_backend_service and google_compute_region_backend_service. Previously, configuring a TTL of 0 caused the attribute to be omitted, resulting in API server defaults and a permanent plan diff.

Fixes hashicorp/terraform-provider-google#29102

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

compute: fixed a permanent diff in `google_compute_backend_service` and `google_compute_region_backend_service` when `cdn_policy.client_ttl` or `cdn_policy.default_ttl` is set to 0

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes for commit b80a6c9:

Diff report

Your PR generated the following diffs in downstream repositories:

Repository	Diff Link	Changes
google provider	View Diff	3 files changed, 66 insertions(+), 4 deletions(-)
google-beta provider	View Diff	3 files changed, 66 insertions(+), 4 deletions(-)
terraform-google-conversion	View Diff	5 files changed, 11 insertions(+), 8 deletions(-)

Test report

Analytics

Total Tests	Passed	Skipped	Affected
1560	1448	95	17

Affected Service Packages

• compute

Learn how VCR tests work

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Step 1: Replaying Mode

Action taken

Found 17 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit.

Click here to see the affected tests

• TestAccComputeBackendService_backendServiceCacheIncludeHttpHeadersExample
• TestAccComputeBackendService_backendServiceCacheSimpleExample
• TestAccComputeBackendService_cdnPolicyZeroTtl
• TestAccComputeBackendService_withCdnPolicy
• TestAccComputeDisk_resourceManagerTags
• TestAccComputeImage_resourceManagerTags
• TestAccComputeInstanceFromMachineImage_diffProject
• TestAccComputeInstanceTemplate_gracefulShutdown
• TestAccComputeInstanceTemplate_resourceManagerTags
• TestAccComputeInstance_GracefulShutdownWithResetUpdate
• TestAccComputeInstance_GracefulShutdownWithoutResetUpdate
• TestAccComputeInstance_resourceManagerTags
• TestAccComputeRegionInstanceTemplate_gracefulShutdown
• TestAccComputeRegionInstanceTemplate_resourceManagerTags
• TestAccComputeSecurityPolicy_withPreconfiguredWafConfig
• TestAccComputeStoragePool_resourceManagerTags
• TestAccComputeTargetInstance_withSecurityPolicy

View the replaying VCR build log

---

Step 2: Recording Mode

Recording Mode	Replaying Rerun	Test Name
✅ Log	✅	TestAccComputeBackendService_backendServiceCacheSimpleExample
✅ Log	✅	TestAccComputeBackendService_withCdnPolicy
✅ Log	✅	TestAccComputeDisk_resourceManagerTags
✅ Log	✅	TestAccComputeImage_resourceManagerTags
✅ Log	✅	TestAccComputeInstanceTemplate_resourceManagerTags
✅ Log	✅	TestAccComputeRegionInstanceTemplate_resourceManagerTags
✅ Log	✅	TestAccComputeStoragePool_resourceManagerTags
❌ Error · Log	-	TestAccComputeBackendService_backendServiceCacheIncludeHttpHeadersExample
❌ Error · Log	-	TestAccComputeBackendService_cdnPolicyZeroTtl
❌ Error · Log	-	TestAccComputeInstanceFromMachineImage_diffProject
❌ Error · Log	-	TestAccComputeInstanceTemplate_gracefulShutdown
❌ Error · Log	-	TestAccComputeInstance_GracefulShutdownWithResetUpdate
❌ Error · Log	-	TestAccComputeInstance_GracefulShutdownWithoutResetUpdate
❌ Error · Log	-	TestAccComputeInstance_resourceManagerTags
❌ Error · Log	-	TestAccComputeRegionInstanceTemplate_gracefulShutdown
❌ Error · Log	-	TestAccComputeSecurityPolicy_withPreconfiguredWafConfig
❌ Error · Log	-	TestAccComputeTargetInstance_withSecurityPolicy

Caution

Issues requiring attention before PR completion

🔴 Initial Recording Failed: Some tests failed during the recording step. See the table above for details.

Please address these issues to complete your PR. If you believe these detections are incorrect or unrelated to your change, please raise the concern with your reviewer.

View the recording VCR build log or the debug logs folder for detailed results.

@roaks3 VCR tests complete for b80a6c9!