- Critical bug causing agent deadlock on Linux/Docker containers leads to removal of packages for those platforms; users are advised to downgrade to 6.4.2.
- Introduces multiple check runners (default 4) for higher concurrency, retries on autodiscovery errors, new cluster name suffix to avoid hostname collisions, and enhanced tagging for ECS Fargate and Kubernetes.
- Deprecates old log configuration flags (logs.config.dd_url, etc.) in favor of new logs.config.* parameters and adds support for sending logs over port 443.