Add Client Device Stats structs in api package

client/stats/cpu_test.go

@@ -29,7 +29,7 @@ func TestHostStats_CPU(t *testing.T) {
 	logger := testlog.HCLogger(t)
 	cwd, err := os.Getwd()
 	assert.Nil(err)
-	hs := NewHostStatsCollector(logger, cwd)
+	hs := NewHostStatsCollector(logger, cwd, nil)
 
 	// Collect twice so we can calculate percents we need to generate some work
 	// so that the cpu values change

client/stats/host.go

@@ -204,6 +204,10 @@ func (h *HostStatsCollector) collectDiskStats() ([]*DiskStats, error) {
 }
 
 func (h *HostStatsCollector) collectDeviceGroupStats() []*DeviceGroupStats {
+	if h.deviceStatsCollector == nil {
+		return []*DeviceGroupStats{}
+	}
+
 	return h.deviceStatsCollector()
 }