What does the graded field represent for performance summary in the GUI dashboard ?
These fields are added from 6.4.3.x code versions and was unavailable in 6.4.2.x
The graded field represents the number of clients for which client health/SNR/Speed/Goodput is not available. For each section the count differs.
We added the N/A notification to make the count of clients matches the total clients and the sum of clients in each buckets under every section.
To add more clarity in the total user count, this field was added in the 6.4.3 versions.