I think you're seeing "processed on worker" value of null because of the next column over states that the task was "suspended: skipped" which in effect means that your extract has failed a certain # of consecutive times (I think 5 is the default value), so it got suspended until you kick it off manually again.
Do you have an idea what log files could have this info? As worker and backgrounder are not identified, it's not in their files........
It's possible that there's nothing in the logs since these tasks didn't run. You have 2 options:
1. Kickoff the extracts manually using "run now". this should take the task out of suspended status and then you can see which backgrounder and then go look at the logs for this.
2. Go back in history for the extract and look at the failures prior to the suspend of the task.
Thank you, Jeff!
I identified the backgrounder by running the refresh manually. I will look further into logs now.