Package pipeline combines all publisher functionality (processors, queue, outputs) to create instances of complete publisher pipelines, beats can connect to publish events to.

GuaranteedSend requires an output to not drop the event on failure, but retry until ACK.

Event is used by the publisher pipeline and broker to pass additional meta-data to the consumers/outputs.

EventCache provides a space for outputs to define per-event metadata that's intended to be used only within the scope of an output.

Batch is used to pass a batch of events to the outputs and asynchronously listening for signals from these outpts.

EventFlags provides additional flags/option types for used with the outputs.