Zuul
The Zuul driver supports triggers only. It is used for triggering pipelines based on internal Zuul events.
Trigger Configuration
Zuul events don’t require a special connection or driver. Instead they
can simply be used by listing zuul as the trigger.
- 
pipeline.trigger.zuul
- The Zuul trigger supports the following attributes: - 
pipeline.trigger.zuul.event (required)
- The event name. Currently supported events: - project-change-merged
- When Zuul merges a change to a project, it generates this event for every open change in the project. - Warning - Triggering on this event can cause poor performance when using the GitHub driver with a large number of installations. 
 - parent-change-enqueued
- When Zuul enqueues a change into any pipeline, it generates this event for every child of that change. 
 
 - 
pipeline.trigger.zuul.pipeline
- Only available for - parent-change-enqueuedevents. This is the name of the pipeline in which the parent change was enqueued.
 
- 
pipeline.trigger.zuul.event (required)