AWS EKS CronJob resource not found
There was an error in Kubernetes that causes failure when using kubectl describe with the cronjob resource. It was fixed at some point between the v1.10.x and v1.12.x versions (more info in this issue #45418).

You said:


  According to my cron pattern, it should have started on the first
  hour.


But your schedule is * */11 * * *, and it means: “At every minute past every 11th hour.”

I did not understand what you exactly meant with "on the first hour", but if you are talking about running the job on every new hour, the schedule should look like this: 0 * * * *