Add a new metric smartctl_device_status for the SMART health status.

metrics.go

@@ -166,4 +166,15 @@ var (
 		},
 		nil,
 	)
+	metricDeviceStatus = prometheus.NewDesc(
+		"smartctl_device_status",
+		"Device status",
+		[]string{
+			"device",
+			"model_family",
+			"model_name",
+			"serial_number",
+		},
+		nil,
+	)
 )

smartctl.go

@@ -50,6 +50,7 @@ func (smart *SMARTctl) Collect() {
 	smart.mineTemperatures()
 	smart.minePowerCycleCount()
 	smart.mineDeviceStatistics()
+	smart.mineDeviceStatus()
 }
 
 func (smart *SMARTctl) mineExitStatus() {
@@ -266,3 +267,16 @@ func (smart *SMARTctl) mineLongFlags(json gjson.Result, flags []string) string {
 	}
 	return strings.Join(result, ",")
 }
+
+func (smart *SMARTctl) mineDeviceStatus() {
+	status := smart.json.Get("smart_status")
+	smart.ch <- prometheus.MustNewConstMetric(
+		metricDeviceStatus,
+		prometheus.GaugeValue,
+		status.Get("passed").Float(),
+		smart.device.device,
+		smart.device.family,
+		smart.device.model,
+		smart.device.serial,
+	)
+}