Azure WebJob显示“Never finished”状态及单例/调度失效求助

I'm running a long-running WebJob (expected to take around 1 hour) on Azure App Service, with the Always on feature enabled. Here's my initialization code:

var host = new JobHost(config); 
host.Call(typeof(Functions).GetMethod("SyncUsers")); 
host.Start();

The SyncUsers method has these attributes applied:

[Timeout("00:59:00", ThrowOnTimeout = true)] 
[NoAutomaticTrigger]

I've set up the scheduling rules via a settings.job file:

{ 
  "is_singleton": true, 
  "schedule": "0 0 */4 * * *" 
}

Core Issues: #

• 90% of the tasks show a "Never finished" status in the WebJobs Dashboard (a few failures due to exceptions are expected). The tasks run for anywhere from 5 to 30 minutes before abruptly stopping, with no exceptions or detailed info in the logs.
• The singleton and schedule rules seem to be failing: multiple tasks are running in parallel, even though they should only execute once every 4 hours.
• Some of these "Never finished" tasks don't show a runtime duration, and their logs can't be viewed or downloaded.

Has anyone encountered similar issues? Any insights or solutions would be greatly appreciated!

内容的提问来源于stack exchange，提问作者Mykhail Galushko