https://github.com/kubernetes/kubernetes/blob/87f9429087d4e31201412548517d36e83abebc8d/pkg/controller/cronjob/utils.go#L74-L87

utils.go

// from: https://github.com/kubernetes/kubernetes/blob/87f9429087d4e31201412548517d36e83abebc8d/pkg/controller/cronjob/utils.go#L74-L87

// groupJobsByParent groups jobs into a map keyed by the job parent UID (e.g. scheduledJob).
// It has no receiver, to facilitate testing.
func groupJobsByParent(js []batchv1.Job) map[types.UID][]batchv1.Job {
	jobsBySj := make(map[types.UID][]batchv1.Job)
	for _, job := range js {
		parentUID, found := getParentUIDFromJob(job)
		if !found {
			klog.V(4).Infof("Unable to get parent uid from job %s in namespace %s", job.Name, job.Namespace)
			continue
		}
		jobsBySj[parentUID] = append(jobsBySj[parentUID], job)
	}
	return jobsBySj
}