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The warning level for processes is set by service.warn_procs.
You should be able to increase the service.warn_procs value to avoid this if it annoys you or is otherwise too noisy.
There's a separate hard limit which is also configurable via service.max_procs. See Server Process Limits
All that being said, I'm not sure what the "Configuration will be completed with default settings for listed options." means at the end of the tabadmin config output. I would look at tabsvc.yml and workgroup.yml after setting to make sure it's 5 and not 4.
thank you! This helps to know. And the backgrounder procs is now set to 5 so we're good.