Add string reason for the last transfer to battery

Author: Jonher937

upscollector.go

@@ -34,6 +34,7 @@ type UPSCollector struct {
 	LastTransferOnBatteryTimeSeconds    *prometheus.Desc
 	LastTransferOffBatteryTimeSeconds   *prometheus.Desc
 	LastSelftestTimeSeconds             *prometheus.Desc
+	LastTransferOnBatteryReason         *prometheus.Desc
 	NominalPowerWatts                   *prometheus.Desc
 	InternalTemperatureCelsius          *prometheus.Desc
 
@@ -152,6 +153,13 @@ func NewUPSCollector(ss StatusSource) *UPSCollector {
 			nil,
 		),
 
+		LastTransferOnBatteryReason: prometheus.NewDesc(
+			prometheus.BuildFQName(namespace, "", "last_transfer_on_battery_reason"),
+			"Reason for last transfer to battery.",
+			[]string{"reason", "ups"},
+			nil,
+		),
+
 		NominalPowerWatts: prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "", "nominal_power_watts"),
 			"Nominal power output in watts.",
@@ -189,6 +197,7 @@ func (c *UPSCollector) Describe(ch chan<- *prometheus.Desc) {
 		c.LastTransferOnBatteryTimeSeconds,
 		c.LastTransferOffBatteryTimeSeconds,
 		c.LastSelftestTimeSeconds,
+		c.LastTransferOnBatteryReason,
 		c.NominalPowerWatts,
 		c.InternalTemperatureCelsius,
 	}
@@ -313,6 +322,14 @@ func (c *UPSCollector) Collect(ch chan<- prometheus.Metric) {
 		s.UPSName,
 	)
 
+	ch <- prometheus.MustNewConstMetric(
+		c.LastTransferOnBatteryReason,
+		prometheus.GaugeValue,
+		1,
+		s.LastTransfer,
+		s.UPSName,
+	)
+
 	ch <- prometheus.MustNewConstMetric(
 		c.NominalPowerWatts,
 		prometheus.GaugeValue,

upscollector_test.go

@@ -43,6 +43,7 @@ func TestUPSCollector(t *testing.T) {
 					XOnBattery:              time.Unix(100001, 0),
 					XOffBattery:             time.Unix(100002, 0),
 					LastSelftest:            time.Unix(100003, 0),
+					LastTransfer:            "Input frequency out of range",
 					NominalPower:            50.0,
 					InternalTemp:            26.4,
 				},
@@ -63,6 +64,7 @@ func TestUPSCollector(t *testing.T) {
 				regexp.MustCompile(`apcupsd_last_transfer_on_battery_time_seconds{ups="bar"} 100001`),
 				regexp.MustCompile(`apcupsd_last_transfer_off_battery_time_seconds{ups="bar"} 100002`),
 				regexp.MustCompile(`apcupsd_last_selftest_time_seconds{ups="bar"} 100003`),
+				regexp.MustCompile(`apcupsd_last_transfer_on_battery_reason{reason="Input frequency out of range",ups="bar"} 1`),
 				regexp.MustCompile(`apcupsd_nominal_power_watts{ups="bar"} 50`),
 				regexp.MustCompile(`apcupsd_internal_temperature_celsius{ups="bar"} 26.4`),
 			},