New monitor status page: From alert to investigation in one click

Datadog's Terraform provider v4.0.0 introduces significant improvements including enhanced resource imports, improved state management, and support for new Datadog products like Usage Envelopes and Serverless Function Monitoring. This release focuses on making infrastructure-as-code with Datadog more reliable and easier to manage, while expanding coverage to more Datadog features. Users are encouraged to review the migration guide due to breaking changes.