Scrape cooling_device state

Signed-off-by: Alex Schmitz <alex.schmitz@gmail.com>

collector/thermal_zone_linux.go

@@ -22,9 +22,14 @@ import (
 	"github.com/prometheus/procfs/sysfs"
 )
 
+const coolingDevice = "cooling_device"
+const thermalZone = "thermal_zone"
+
 type thermalZoneCollector struct {
-	fs       sysfs.FS
-	zoneTemp *prometheus.Desc
+	fs                    sysfs.FS
+	coolingDeviceCurState *prometheus.Desc
+	coolingDeviceMaxState *prometheus.Desc
+	zoneTemp              *prometheus.Desc
 }
 
 func init() {
@@ -41,10 +46,20 @@ func NewThermalZoneCollector() (Collector, error) {
 	return &thermalZoneCollector{
 		fs: fs,
 		zoneTemp: prometheus.NewDesc(
-			prometheus.BuildFQName(namespace, "thermal_zone", "temp"),
+			prometheus.BuildFQName(namespace, thermalZone, "temp"),
 			"Zone temperature in Celsius",
 			[]string{"zone", "type"}, nil,
 		),
+		coolingDeviceCurState: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, coolingDevice, "cur_state"),
+			"Current throttle state of the cooling device",
+			[]string{"name", "type"}, nil,
+		),
+		coolingDeviceMaxState: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, coolingDevice, "max_state"),
+			"Maximum throttle state of the cooling device",
+			[]string{"name", "type"}, nil,
+		),
 	}, nil
 }
 
@@ -64,5 +79,28 @@ func (c *thermalZoneCollector) Update(ch chan<- prometheus.Metric) error {
 		)
 	}
 
+	coolingDevices, err := c.fs.ClassCoolingDeviceStats()
+	if err != nil {
+		return err
+	}
+
+	for _, stats := range coolingDevices {
+		ch <- prometheus.MustNewConstMetric(
+			c.coolingDeviceCurState,
+			prometheus.GaugeValue,
+			float64(stats.CurState),
+			stats.Name,
+			stats.Type,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			c.coolingDeviceMaxState,
+			prometheus.GaugeValue,
+			float64(stats.MaxState),
+			stats.Name,
+			stats.Type,
+		)
+	}
+
 	return nil
 }