Request message for CreateJobTrigger.
.. attribute:: parent
Required. The parent resource name, for example projects/my-
project-id or projects/my-project-id/locations/{location_id}.
The trigger id can contain uppercase and lowercase letters,
numbers, and hyphens; that is, it must match the regular
expression: [a-zA-Z\d-_]+. The maximum length is 100
characters. Can be empty to allow the system to generate one.