Azure Scheduler is scheduled to retire on September 30, 2019. Migration documentation says "All Scheduler job collections and jobs will be deleted from the system."
In our Azure portal, webjobs are displayed under a scheduler job collection "WebJobs-NorthCentralUS". Are all these jobs going to be deleted?
The web jobs won't be deleted, but the tiggers will, so they won't execute on schedule anymore. You can set up a logic app to poke them or you can redeploy them with a cron expression.