Merge pull request #25425 from salva-gglez/caution_startingDeadlineSeconds

Add a caution message on CronJob Controller workload if using startingDeadlineSeconds

Author: k8s-ci-robot

content/en/docs/concepts/workloads/controllers/cron-jobs.md

@@ -90,6 +90,11 @@ If `startingDeadlineSeconds` is set to a large value or left unset (the default)
 and if `concurrencyPolicy` is set to `Allow`, the jobs will always run
 at least once.
 
+{{< caution >}}
+If `startingDeadlineSeconds` is set to a value less than 10 seconds, the CronJob may not be scheduled. This is because the CronJob controller checks things every 10 seconds.
+{{< /caution >}}
+
+
 For every CronJob, the CronJob {{< glossary_tooltip term_id="controller" >}} checks how many schedules it missed in the duration from its last scheduled time until now. If there are more than 100 missed schedules, then it does not start the job and logs the error
 
 ````
@@ -128,4 +133,3 @@ documents the format of CronJob `schedule` fields.
 For instructions on creating and working with cron jobs, and for an example of CronJob
 manifest, see [Running automated tasks with cron jobs](/docs/tasks/job/automated-tasks-with-cron-jobs).
 
-