I’m having the exact same issue. I did a top process sum, and once I try to select the tag I grouped by, I’m unable to get anything back.
For example:
select top(IOReads,5),process_name from (select sum(IOReadBytesPerSec) as IOReads FROM "top_processes" WHERE time > now() - 1h GROUP BY "process_name" fill(null) )
The process_name is empty when selected
