How to fix Cannot determine if job needs to be started in Kubernetes

# Check the CronJob status
kubectl describe cronjob my-cronjob -n my-namespace

# Look for 'Active=False' and the 'TooManyMissedStartTimes' reason
kubectl get cronjobs my-cronjob -n my-namespace -o jsonpath='{.status.conditions}' | jq .

apiVersion: batch/v1
kind: CronJob
metadata:
  name: my-cronjob
spec:
  schedule: "0 * * * *"  # Every hour
  startingDeadlineSeconds: 3600  # Count missed schedules only in last hour
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: job-container
            image: myimage:latest
          restartPolicy: OnFailure

schedule: "*/5 * * * *"
startingDeadlineSeconds: 600  # 10 minutes—enough for 2 missed schedules

concurrencyPolicy: Replace
startingDeadlineSeconds: 7200
jobTemplate:
  spec:
    activeDeadlineSeconds: 1800  # Job must complete within 30 minutes

# Check for time drift by examining node status timestamps
kubectl get nodes -o json | jq '.items[] | {name: .metadata.name, conditions: .status.conditions[].lastHeartbeatTime}'

# Check node health
kubectl get nodes -o custom-columns=NAME:.metadata.name,READY:.status.conditions[?(@.type=="Ready")].status

# Save the current CronJob definition
kubectl get cronjob my-cronjob -n my-namespace -o yaml > cronjob-backup.yaml

# Delete the CronJob
kubectl delete cronjob my-cronjob -n my-namespace --cascade=orphan

# Recreate with updated configuration
kubectl apply -f cronjob-backup.yaml

# Verify it's now active
kubectl describe cronjob my-cronjob -n my-namespace | grep -A5 'Conditions\|Last Schedule'

# Verify CronJob is active again
kubectl get cronjobs my-cronjob -n my-namespace -o jsonpath='{.status.conditions}'

# Check that Jobs are being created on schedule
kubectl get jobs -n my-namespace | grep my-cronjob

- alert: CronJobTooManyMissedSchedules
  expr: kube_cronjob_status_active == 0
  for: 5m
  annotations:
    summary: "CronJob {{ $labels.cronjob }} has no active schedule"