ExecutionOrder

The scheduler guarantees a sequential execution order. Tasks are executed in the order they were received.

The scheduler does not guarantee a sequential execution order. Tasks may be executed concurrently or in a different order than received.

The execution order of the scheduler is unknown. This is typically used when the scheduler is a wrapper around another service or dispatcher where the execution order cannot be directly determined. It is important to note that 'Unknown' should not be treated as 'OutOfOrder'. It may represent a sequential scheduler and any optimization assuming an 'OutOfOrder' execution may potentially disrupt the actual execution order.