Hmm, good question - You say you have a couple working without issue? which ones are they?
I just took a look at the workspace and there miight be a bug in them.
The documentation says that you need to run the "JobHistoryStatisticsGathering.fmw" as a one off or to create a schedule using this to generate the statistics once a day.
I downloaded the workspace with FME Desktop 2021 and took a look at the workspace and the path where it's set up to write data is:
$(FME_SHAREDRESOURCE_DASHBOARD)/temp_lw
Whats weird though is that if I look in the FME Server UI at the output path in the JobHistoryStatisticsGathering.fmw I see this (it still says /temp). (Note I'm on FME 2020 not FME 2021)
The "DailyAverageQueuedTime.fmw" workspace is set up to look in:
$(FME_SHAREDRESOURCE_DASHBOARD)/temp
You should be able to check where your Job stats have been output by looking in
Files&Connections>Resources>Dashboards
If you see a temp_lw folder this is where the problem is. You will need to fix the JobHistoryStatisticsGathering.fmw workdpace by setting the output path back to $(FME_SHAREDRESOURCE_DASHBOARD)/temp and republishing.
This is a super weird bug...perhaps @hollyatsafe can see if this is reproducible
I should also point out that our FME Server has been backed up and restored a number of times, so it's likely/possible that the worksapces we have in dashboards are from a much older version of FME Server. I see that the CSV writer used is the Legacy CSV writer (not CSV2). Perhaps the '_lw' means "Legacy Writer"?