The event payload to transform through the playbook. Can be the original client event or
intermediate output from a prior transform step. Use original_event to provide the unmodified
client event when input_event has been transformed and may be missing metadata fields.

The unmodified client event. Used to derive event name for playbook stanza matching.
When omitted, event identifiers are extracted from input_event.

PipelineFilter is optional and would run prior to the Playbook

Playbook is optional, but one of either playbook or pipeline_filter required. Both is also valid.