We are using AOE cron scheduler from Fabrizio Branca. My scheduled tasks are loading, cron working fine etc. When I look at the timeline or list view, the jobs are loading successfully. But all of a sudden we are seeing the error message:
Last heartbeat is older than 37 minutes for example.
So the heartbeat scheduled task is not running at all currently. Any ideas how to begin debugging to try to work out the cause? I have looked at the log files which are giving no clues. I can manually run the task, but that is obviously not a solution. Any advice or ideas would be appreciated. Thanks.