The HashiCorp Terraform Azure Stack provider 1.0 release includes several provider behavior improvements, new resources for compute, networking, DNS, and Key Vault services, and supports a new service for Key Vault. The provider is now compatible with Terraform 0.12 and later, but no longer supports versions 0.10 and 0.11. The update introduces custom timeouts, resource group safe delete 'on' by default, features blocks, and allows importing existing resources into the state. Additionally, some deprecated fields, data sources, and resources have been removed from the provider, including the security_provider_name field under the azurestack_virtual_wan resource, which is no longer supported by Azure. The update also includes new resources such as separate Windows and Linux virtual machine scale sets, eight new DNS resources, and initial support for new Key Vault services.