What event needs to occur for a new job to be started.
This message has
oneof_ fields (mutually exclusive fields).
For each oneof, at most one member field can be set at the same time.
Setting any member of the oneof automatically clears all other
Create a job on a repeating basis based on the elapse of time. This field is a member of `oneof`_ ``trigger``.
For use with hybrid jobs. Jobs must be manually created and finished. This field is a member of `oneof`_ ``trigger``.