@Marvin What does the Cancellation Cleanup service do?

The Cancellation Cleanup service in Prefect is responsible for managing the cancellation of flow runs. When a cancellation request is made, the flow run moves to a "Cancelling" state. If the deployment uses a work pool-based deployment with a worker, the worker monitors the state and sends a termination signal to the flow run infrastructure. If the run doesn't terminate within a grace period (default is 30 seconds), the infrastructure is forcibly terminated to ensure the flow run exits. Key points include: - Cancellation requires an associated deployment. - Inline nested flow runs cannot be cancelled independently unless deployed separately. - The service is resilient to worker restarts and uses metadata to track infrastructure. For more details, you can refer to the Prefect documentation on cancellation.