How can a add "onduty" to all job to my server?

I’m looking for a script that works the same as “on duty” at all emergency services
Would need it for all the jobs on my server.
so you can work more places.

If anyone knows if there is or if it is possible to fix it.

Looking for the same thing but some so called ‘‘coders’’ are doing lazy scripts just to have a release on their page.
If i find on i’ll share it with you if you still need it.