public interface AzkabanEventReporter
Implement this interface to report flow and job events. Event reporter
can be turned on by setting the property AZKABAN_EVENT_REPORTING_ENABLED to true.
By default, a KafkaAvroEventReporter is provided. Alternate implementations
can be provided by setting the property AZKABAN_EVENT_REPORTING_CLASS_PARAM
The constructor will be called with a azkaban.utils.Props object passed as
the only parameter. If such a constructor doesn't exist, then the AzkabanEventReporter
instantiation will fail.