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The ProjectEvent type returned by event operations.
Publish events from outside a flow-notebooks, deployed apps, scripts. Inside a @step, prefer prj.publish_event() above.
Events resolve to prj.{project}.{branch}.{name}, the same namespace consumed by @project_trigger. The equivalent low-level Metaflow call is ArgoEvent("prj.my_prj.main.model_trained").safe_publish(payload=...).