Embedded types should be at the top of the field list of a struct.

And there should be an empty line separating embedded fields from regular fields

collectors/nfsiostatMetric.go

@@ -34,6 +34,7 @@ type NfsIOStatCollectorConfig struct {
 // defined by metricCollector (name, init, ...)
 type NfsIOStatCollector struct {
 	metricCollector
+
 	config        NfsIOStatCollectorConfig    // the configuration structure
 	meta          map[string]string           // default meta information
 	tags          map[string]string           // default tags