Create changelog for Terraform v5.6.0 release (cloudflare#23070)

Author: musa-cf

src/content/changelog/fundamentals/2025-06-17-terraform-v5.6.0-provider.mdx

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+---
+title: Terraform v5.6.0 now available
+description: Terraform v5.6.0 fixes a number of known bugs in the v5 Provider
+products:
+  - fundamentals
+date: 2025-06-17
+---
+
+Earlier this year, we announced the launch of the new [Terraform v5 Provider](/changelog/2025-02-03-terraform-v5-provider/).
+Unlike the earlier Terraform providers, v5 is automatically generated based on the OpenAPI Schemas for our REST APIs. Since
+launch, we have seen an unexpectedly high number of [issues](https://github.com/cloudflare/terraform-provider-cloudflare)
+reported by customers. These issues currently impact about 15% of resources. We have been working diligently to address
+these issues across the company, and have released the v5.6.0 release which includes a number of bug fixes. Please keep an
+eye on this changelog for more information about upcoming releases.
+
+### Changes
+
+- Broad fixes across resources with recurring diffs, including, but not limited to:
+  - `cloudflare_zero_trust_access_identity_provider`
+	- `cloudflare_zone`
+- `cloudflare_page_rules` runtime panic when setting `cache_level` to `cache_ttl_by_status`
+- Failure to serialize requests in `cloudflare_zero_trust_tunnel_cloudflared_config`
+- Undocumented field 'priority' on `zone_lockdown` resource
+- Missing importability for `cloudflare_zero_trust_device_default_profile_local_domain_fallback` and `cloudflare_account_subscription`
+- New resources:
+  - `cloudflare_schema_validation_operation_settings`
+  - `cloudflare_schema_validation_schemas`
+  - `cloudflare_schema_validation_settings`
+  - `cloudflare_zero_trust_device_settings`
+- Other bug fixes
+
+For a more detailed look at all of the changes, see the
+[changelog](https://github.com/cloudflare/terraform-provider-cloudflare/releases/tag/v5.6.0) in GitHub.
+
+### Issues Closed
+- [#5098: 500 Server Error on updating 'zero_trust_tunnel_cloudflared_virtual_network' Terraform resource](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5098)
+- [#5148: cloudflare_user_agent_blocking_rule doesn’t actually support user agents](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5148)
+- [#5472: cloudflare_zone showing changes in plan after following upgrade steps](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5472)
+- [#5508: cloudflare_zero_trust_tunnel_cloudflared_config failed to serialize http request](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5508)
+- [#5509: cloudflare_zone: Problematic Terraform behaviour with paused zones](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5509)
+- [#5520: Resource 'cloudflare_magic_wan_static_route' is not working](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5520)
+- [#5524: Optional fields cause crash in cloudflare_zero_trust_tunnel_cloudflared(s) when left null](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5524)
+- [#5526: Provider v5 migration issue: no import method for cloudflare_zero_trust_device_default_profile_local_domain_fallback](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5526)
+- [#5532: cloudflare_zero_trust_access_identity_provider detects changes on every plan](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5532)
+- [#5561: cloudflare_zero_trust_tunnel_cloudflared: cannot rotate tunnel secret](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5561)
+- [#5569: cloudflare_zero_trust_device_custom_profile_local_domain_fallback not allowing multiple DNS Server entries](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5569)
+- [#5577: Panic modifying page_rule resource](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5577)
+- [#5653: cloudflare_zone_setting resource schema confusion in 5.5.0: value vs enabled](https://github.com/cloudflare/terraform-provider-cloudflare/issues/5653)
+
+If you have an unaddressed issue with the provider, we encourage you to check the
+[open issues](https://github.com/cloudflare/terraform-provider-cloudflare/issues) and open a new one if one does not already
+exist for what you are experiencing.
+
+### Upgrading
+
+If you are evaluating a move from v4 to v5, please make use of the
+[migration guide](https://registry.terraform.io/providers/cloudflare/cloudflare/latest/docs/guides/version-5-upgrade). We have
+provided automated migration scripts using Grit which simplify the transition, although these do not support implementations which
+use Terraform modules, so customers making use of modules need to migrate manually. Please make use of `terraform plan` to test
+your changes before applying, and let us know if you encounter any additional issues by reporting to our
+[GitHub repository](https://github.com/cloudflare/terraform-provider-cloudflare).
+
+### For more info
+
+- [Terraform provider](https://registry.terraform.io/providers/cloudflare/cloudflare/latest/docs)
+- [Documentation on using Terraform with Cloudflare](/terraform/)