Merge pull request #419 from mdlayher/zfs-fail-debug

Make ZFS collector fail gracefully when not available

collector/zfs.go

@@ -63,10 +63,6 @@ func NewZFSCollector() (Collector, error) {
 func (c *zfsCollector) Update(ch chan<- prometheus.Metric) (err error) {
 	// Arcstats
 	err = c.updateArcstats(ch)
-	if err != nil {
-		return err
-	}
-
 	switch {
 	case err == zfsNotAvailableError:
 		log.Debug(err)