I have 14% of the disk usage and 15% of the storage avail. pct when defrag-lwm-pct is 50. So, when I set defrag-lwm-pct like 80 then I have got 33% storage avail. pct
I think, the 80 is high for defrag-lwm-pct and I worry about the size of the defragmentation queue. But defrag-q is presented in logs only.
Wanted to be sure you were on at least 3.9.0, since a lot of metrics were added. Seems per device metrics aren’t yet available via the info api. I opened a ticket AER-4969 for this request.