When failed to create the job by jobset , better to create events for the failure. 

4.20 

    Always

1) Deploy jobset operator ;
2) create jobset like : 
apiVersion: jobset.x-k8s.io/v1alpha2
kind: JobSet
metadata:
  name: success-policy
spec:
# We want to declare our JobSet successful if workers finish.
# If workers finish we should clean up the remaining replicatedJobs.
  successPolicy:
    operator: All
    targetReplicatedJobs:
    - workers
  replicatedJobs:
  - name: leader
    replicas: 1
    template:
      spec:
        # Set backoff limit to 0 so job will immediately fail if any pod fails.
        backoffLimit: 0 
        completions: 1
        parallelism: 1
        template:
          spec:
            containers:
            - name: leader
              image: quay.io/openshifttest/hello-openshift:1.2.0
              command:
              - bash
              - -xc
              - |
                sleep 100
  - name: workers
    replicas: 1
    template:
      spec:
        backoffLimit: 0 
        parallelism: 5
        template:
          spec:
            containers:
            - name: worker
              image: quay.io/openshifttest/hello-openshift:1.2.0
              command:
              - bash
              - -xc
              - |
                if [[ "$JOB_COMPLETION_INDEX" == "0" ]]; then
                  for i in $(seq 10 -1 1)
                  do
                    echo "Sleeping in $i"
                    sleep 1
                  done
                  exit $(rand 0 1)
                fi     

 2) failed to create the worker job, but no events , check the jobset-controller-manager , could see logs : 

2025-09-05T11:27:55Z	ERROR	Reconciler error	{"controller": "jobset", "controllerGroup": "jobset.x-k8s.io", "controllerKind": "JobSet", "JobSet": {"name":"success-policy","namespace":"zhouy"}, "namespace": "zhouy", "name": "success-policy", "reconcileID": "0b09ae51-1cd2-4c31-a908-87d0bee067a8", "error": "job \"success-policy-workers-0\" creation failed with error: Job.batch \"success-policy-workers-0\" is invalid: spec.completions: Required value: when completion mode is Indexed"}sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).reconcileHandler	/workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:353sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).processNextWorkItem	/workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:300sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Start.func2.1	/workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:202

   Should show events about the failure