Sandbox Creation Saga

Convert sandbox creation to use saga framework, replacing manual defer-based cleanup with crash-recoverable saga pattern.

Scope

Extract Actions from SandboxController.createSandbox:

• NetworkAllocatorAction - allocate network, compensate by deallocating
• SpecBuilderAction - build container spec (pure, no compensation)
• VolumeConfiguratorAction - configure volumes
• ContainerCreatorAction - create pause container
• TaskBooterAction - boot initial task
• ContainersBooterAction - boot all containers
• MetricsAdderAction - add metrics
• EntitySaverAction - save final sandbox entity

Action Factories:

• Create factories for each action type
• Inject SandboxController dependencies at boot
• Register factories in SagaRegistry

Definition Registration:

• Register "create-sandbox" definition with DAG structure
• Define dependencies between actions

Entry Point:

• Add CreateSandboxSaga() method alongside existing createSandbox()
• Feature flag to control which path is used
• Pass sandbox ID and metadata via InitialInputs

Testing:

• Integration tests with MockStore
• Success path verification
• Failure injection at each step, verify compensation
• Crash recovery simulation
• Verify no regressions vs existing implementation

Observability:

• Logging for saga execution
• Metrics on saga duration and success rate

Why One Issue

This is a complete end-to-end saga that proves the framework works in production. Splitting it would leave partial, non-functional code.

Dependencies

Requires: MIR-439 (Saga Framework Foundation)

Reference

RFD 0035: Saga Pattern for Distributed Operations Phase 2 from Migration Strategy