Add go sdk

performancemetrics/disk.go

@@ -0,0 +1,16 @@
+package performancemetrics
+
+import "syscall"
+
+func getDiskUsage(path string) (used, free, total uint64, err error) {
+	var stat syscall.Statfs_t
+	err = syscall.Statfs(path, &stat)
+	if err != nil {
+		return
+	}
+
+	total = stat.Blocks * uint64(stat.Bsize)
+	free = stat.Bfree * uint64(stat.Bsize)
+	used = total - free
+	return
+}