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`COUNT` is not a correct aggregation. It just returns the count of metric points. `system_filesystem_usage` is up down counter. So you can use something like `Max` in the time range.

ok, Thanks , I have converted it to Max and metric is `bytes` now its showing 74 GB, when checking from terminal after SSH into the machine with `df -h` its showing 70 GB, not sure if its correct to assume that they are same. am I missing something ?

What does it show if you select `NOOP`? It is the data without any aggregation. I suggested `MAX` since that would be appropriate considering the work case. but since it is an up-down counter, that value might go down in the aggregation interval duration.