feat: add support for cpu freq governor metrics

Signed-off-by: Lukas Coppens <lukas.coppens@be-mobile.com>

collector/cpufreq_common.go

@@ -23,17 +23,17 @@ import (
 var (
 	cpuFreqHertzDesc = prometheus.NewDesc(
 		prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "frequency_hertz"),
-		"Current cpu thread frequency in hertz.",
+		"Current CPU thread frequency in hertz.",
 		[]string{"cpu"}, nil,
 	)
 	cpuFreqMinDesc = prometheus.NewDesc(
 		prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "frequency_min_hertz"),
-		"Minimum cpu thread frequency in hertz.",
+		"Minimum CPU thread frequency in hertz.",
 		[]string{"cpu"}, nil,
 	)
 	cpuFreqMaxDesc = prometheus.NewDesc(
 		prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "frequency_max_hertz"),
-		"Maximum cpu thread frequency in hertz.",
+		"Maximum CPU thread frequency in hertz.",
 		[]string{"cpu"}, nil,
 	)
 	cpuFreqScalingFreqDesc = prometheus.NewDesc(
@@ -51,4 +51,9 @@ var (
 		"Maximum scaled CPU thread frequency in hertz.",
 		[]string{"cpu"}, nil,
 	)
+	cpuFreqScalingGovernorDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, cpuCollectorSubsystem, "scaling_governor"),
+		"Current enabled CPU frequency governor.",
+		[]string{"cpu", "governor"}, nil,
+	)
 )

collector/cpufreq_linux.go

@@ -104,6 +104,22 @@ func (c *cpuFreqCollector) Update(ch chan<- prometheus.Metric) error {
 				stats.Name,
 			)
 		}
+		if stats.Governor != "" {
+			availableGovernors := strings.Split(stats.AvailableGovernors, " ")
+			for _, g := range availableGovernors {
+				state := 0
+				if g == stats.Governor {
+					state = 1
+				}
+				ch <- prometheus.MustNewConstMetric(
+					cpuFreqScalingGovernorDesc,
+					prometheus.GaugeValue,
+					float64(state),
+					stats.Name,
+					g,
+				)
+			}
+		}
 	}
 	return nil
 }

collector/fixtures/e2e-64k-page-output.txt

@@ -326,6 +326,16 @@ node_cpu_scaling_frequency_min_hertz{cpu="0"} 8e+08
 node_cpu_scaling_frequency_min_hertz{cpu="1"} 8e+08
 node_cpu_scaling_frequency_min_hertz{cpu="2"} 1e+06
 node_cpu_scaling_frequency_min_hertz{cpu="3"} 1e+06
+# HELP node_cpu_scaling_governor Current enabled CPU frequency governor.
+# TYPE node_cpu_scaling_governor gauge
+node_cpu_scaling_governor{cpu="0",governor="performance"} 0
+node_cpu_scaling_governor{cpu="0",governor="powersave"} 1
+node_cpu_scaling_governor{cpu="1",governor="performance"} 0
+node_cpu_scaling_governor{cpu="1",governor="powersave"} 1
+node_cpu_scaling_governor{cpu="2",governor="performance"} 0
+node_cpu_scaling_governor{cpu="2",governor="powersave"} 1
+node_cpu_scaling_governor{cpu="3",governor="performance"} 0
+node_cpu_scaling_governor{cpu="3",governor="powersave"} 1
 # HELP node_cpu_seconds_total Seconds the CPUs spent in each mode.
 # TYPE node_cpu_seconds_total counter
 node_cpu_seconds_total{cpu="0",mode="idle"} 10870.69

collector/fixtures/e2e-output.txt

@@ -348,6 +348,16 @@ node_cpu_scaling_frequency_min_hertz{cpu="0"} 8e+08
 node_cpu_scaling_frequency_min_hertz{cpu="1"} 8e+08
 node_cpu_scaling_frequency_min_hertz{cpu="2"} 1e+06
 node_cpu_scaling_frequency_min_hertz{cpu="3"} 1e+06
+# HELP node_cpu_scaling_governor Current enabled CPU frequency governor.
+# TYPE node_cpu_scaling_governor gauge
+node_cpu_scaling_governor{cpu="0",governor="performance"} 0
+node_cpu_scaling_governor{cpu="0",governor="powersave"} 1
+node_cpu_scaling_governor{cpu="1",governor="performance"} 0
+node_cpu_scaling_governor{cpu="1",governor="powersave"} 1
+node_cpu_scaling_governor{cpu="2",governor="performance"} 0
+node_cpu_scaling_governor{cpu="2",governor="powersave"} 1
+node_cpu_scaling_governor{cpu="3",governor="performance"} 0
+node_cpu_scaling_governor{cpu="3",governor="powersave"} 1
 # HELP node_cpu_seconds_total Seconds the CPUs spent in each mode.
 # TYPE node_cpu_seconds_total counter
 node_cpu_seconds_total{cpu="0",mode="idle"} 10870.69