This message type is emitted by the TickGenerator to the whole pipeline, informing all stages about the time at which this Tick was emitted (relative to some arbitrary epoch).
This message type is used by the TickGenerator to trigger the rescheduling of the next Tick.
This message type is used by the TickGenerator to trigger the rescheduling of the next Tick. The actor hosting the pipeline which includes a TickGenerator must arrange for messages of this type to be injected into the management port of the pipeline.