Move newly added metrics out of base metrics and into goCollector

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

prometheus/collectors/go_collector_latest.go

@@ -88,6 +88,12 @@ func WithGoCollectorMemStatsMetricsDisabled() func(options *internal.GoCollector
 	}
 }
 
+func WithGoCollectorRuntimeEnvVarsMetricsDisabled() func(options *internal.GoCollectorOptions) {
+	return func(o *internal.GoCollectorOptions) {
+		o.DisableRuntimeEnvVarsMetrics = true
+	}
+}
+
 // GoRuntimeMetricsRule allow enabling and configuring particular group of runtime/metrics.
 // TODO(bwplotka): Consider adding ability to adjust buckets.
 type GoRuntimeMetricsRule struct {

prometheus/collectors/go_collector_latest_test.go

@@ -31,9 +31,6 @@ import (
 
 var baseMetrics = []string{
 	"go_gc_duration_seconds",
-	"go_gogc_percent",
-	"go_gomaxprocs",
-	"go_gomemlimit",
 	"go_goroutines",
 	"go_info",
 	"go_memstats_last_gc_time_seconds",

prometheus/go_collector.go

@@ -212,9 +212,6 @@ type baseGoCollector struct {
 	gcDesc         *Desc
 	gcLastTimeDesc *Desc
 	goInfoDesc     *Desc
-	goMaxProcs     *Desc
-	goGogcPercent  *Desc
-	goMemLimit     *Desc
 }
 
 func newBaseGoCollector() baseGoCollector {
@@ -239,18 +236,6 @@ func newBaseGoCollector() baseGoCollector {
 			"go_info",
 			"Information about the Go environment.",
 			nil, Labels{"version": runtime.Version()}),
-		goMaxProcs: NewDesc(
-			"go_gomaxprocs",
-			"Value of GOMAXPROCS, i.e number of usable threads.",
-			nil, nil),
-		goGogcPercent: NewDesc(
-			"go_gogc_percent",
-			"Value of GOGC (percentage).",
-			nil, nil),
-		goMemLimit: NewDesc(
-			"go_gomemlimit",
-			"Value of GOMEMLIMIT (bytes).",
-			nil, nil),
 	}
 }
 
@@ -261,9 +246,6 @@ func (c *baseGoCollector) Describe(ch chan<- *Desc) {
 	ch <- c.gcDesc
 	ch <- c.gcLastTimeDesc
 	ch <- c.goInfoDesc
-	ch <- c.goMaxProcs
-	ch <- c.goGogcPercent
-	ch <- c.goMemLimit
 }
 
 // Collect returns the current state of all metrics of the collector.
@@ -285,18 +267,6 @@ func (c *baseGoCollector) Collect(ch chan<- Metric) {
 	ch <- MustNewConstSummary(c.gcDesc, uint64(stats.NumGC), stats.PauseTotal.Seconds(), quantiles)
 	ch <- MustNewConstMetric(c.gcLastTimeDesc, GaugeValue, float64(stats.LastGC.UnixNano())/1e9)
 	ch <- MustNewConstMetric(c.goInfoDesc, GaugeValue, 1)
-	ch <- MustNewConstMetric(c.goMaxProcs, GaugeValue, float64(runtime.NumCPU()))
-
-	gogcSample := make([]runmetr.Sample, 1)
-	gogcSample[0].Name = "/gc/gogc:percent"
-	runmetr.Read(gogcSample)
-	ch <- MustNewConstMetric(c.goGogcPercent, GaugeValue, float64(gogcSample[0].Value.Uint64()))
-
-	memLimitSample := make([]runmetr.Sample, 1)
-	memLimitSample[0].Name = "/gc/gomemlimit:bytes"
-	runmetr.Read(memLimitSample)
-	ch <- MustNewConstMetric(c.goMemLimit, GaugeValue, float64(memLimitSample[0].Value.Uint64()))
-
 }
 
 func memstatNamespace(s string) string {
@@ -310,3 +280,48 @@ type memStatsMetrics []struct {
 	eval    func(*runtime.MemStats) float64
 	valType ValueType
 }
+
+func goRuntimeEnvVarsMetrics() runtimeEnvVarsMetrics {
+	return runtimeEnvVarsMetrics{
+		{
+			desc: NewDesc(
+				"go_gogc_percent",
+				"Value of GOGC (percentage).",
+				nil, nil,
+			),
+			eval:    float64(readRunMetrSample("/gc/gogc:percent")[0].Value.Uint64()),
+			valType: GaugeValue,
+		},
+		{
+			desc: NewDesc(
+				"go_gomemlimit",
+				"Value of GOMEMLIMIT (bytes).",
+				nil, nil,
+			),
+			eval:    float64(readRunMetrSample("/gc/gomemlimit:bytes")[0].Value.Uint64()),
+			valType: GaugeValue,
+		},
+		{
+			desc: NewDesc(
+				"go_gomaxprocs",
+				"Value of GOMAXPROCS, i.e number of usable threads.",
+				nil, nil,
+			),
+			eval:    float64(runtime.NumCPU()),
+			valType: GaugeValue,
+		},
+	}
+}
+
+type runtimeEnvVarsMetrics []struct { // how to call this struct?
+	desc    *Desc
+	eval    float64
+	valType ValueType
+}
+
+func readRunMetrSample(metricName string) []runmetr.Sample {
+	sample := make([]runmetr.Sample, 1)
+	sample[0].Name = metricName
+	runmetr.Read(sample)
+	return sample
+}

prometheus/go_collector_latest.go

@@ -31,6 +31,7 @@ import (
 
 const (
 	// constants for strings referenced more than once.
+	goGCGogcPercent                         = "/gc/gogc:percent"
 	goGCHeapTinyAllocsObjects               = "/gc/heap/tiny/allocs:objects"
 	goGCHeapAllocsObjects                   = "/gc/heap/allocs:objects"
 	goGCHeapFreesObjects                    = "/gc/heap/frees:objects"
@@ -38,6 +39,7 @@ const (
 	goGCHeapAllocsBytes                     = "/gc/heap/allocs:bytes"
 	goGCHeapObjects                         = "/gc/heap/objects:objects"
 	goGCHeapGoalBytes                       = "/gc/heap/goal:bytes"
+	goGCMemLimit                            = "/gc/gomemlimit:bytes"
 	goMemoryClassesTotalBytes               = "/memory/classes/total:bytes"
 	goMemoryClassesHeapObjectsBytes         = "/memory/classes/heap/objects:bytes"
 	goMemoryClassesHeapUnusedBytes          = "/memory/classes/heap/unused:bytes"
@@ -52,6 +54,7 @@ const (
 	goMemoryClassesProfilingBucketsBytes    = "/memory/classes/profiling/buckets:bytes"
 	goMemoryClassesMetadataOtherBytes       = "/memory/classes/metadata/other:bytes"
 	goMemoryClassesOtherBytes               = "/memory/classes/other:bytes"
+	goSchedMaxProcs                         = "/sched/gomaxprocs:threads"
 )
 
 // rmNamesForMemStatsMetrics represents runtime/metrics names required to populate goRuntimeMemStats from like logic.
@@ -78,6 +81,12 @@ var rmNamesForMemStatsMetrics = []string{
 	goMemoryClassesOtherBytes,
 }
 
+var rmNamesForEnvVarsMetrics = []string{ // how to call them???
+	goGCGogcPercent,
+	goGCMemLimit,
+	goSchedMaxProcs,
+}
+
 func bestEffortLookupRM(lookup []string) []metrics.Description {
 	ret := make([]metrics.Description, 0, len(lookup))
 	for _, rm := range metrics.All() {
@@ -116,6 +125,9 @@ type goCollector struct {
 	// as well.
 	msMetrics        memStatsMetrics
 	msMetricsEnabled bool
+
+	rmEnvVarMetrics        runtimeEnvVarsMetrics // how to call them???
+	rmEnvVarMetricsEnabled bool
 }
 
 type rmMetricDesc struct {
@@ -193,7 +205,7 @@ func NewGoCollector(opts ...func(o *internal.GoCollectorOptions)) Collector {
 	metricSet := make([]collectorMetric, 0, len(exposedDescriptions))
 	// SampleBuf is used for reading from runtime/metrics.
 	// We are assuming the largest case to have stable pointers for sampleMap purposes.
-	sampleBuf := make([]metrics.Sample, 0, len(exposedDescriptions)+len(opt.RuntimeMetricSumForHist)+len(rmNamesForMemStatsMetrics))
+	sampleBuf := make([]metrics.Sample, 0, len(exposedDescriptions)+len(opt.RuntimeMetricSumForHist)+len(rmNamesForMemStatsMetrics)+len(rmNamesForEnvVarsMetrics))
 	sampleMap := make(map[string]*metrics.Sample, len(exposedDescriptions))
 	for _, d := range exposedDescriptions {
 		namespace, subsystem, name, ok := internal.RuntimeMetricsToProm(&d.Description)
@@ -257,6 +269,8 @@ func NewGoCollector(opts ...func(o *internal.GoCollectorOptions)) Collector {
 	var (
 		msMetrics             memStatsMetrics
 		msDescriptions        []metrics.Description
+		rmEnvVarMetrics       runtimeEnvVarsMetrics
+		rmEnvVarsDescriptions []metrics.Description
 	)
 
 	if !opt.DisableMemStatsLikeMetrics {
@@ -273,6 +287,19 @@ func NewGoCollector(opts ...func(o *internal.GoCollectorOptions)) Collector {
 		}
 	}
 
+	if !opt.DisableRuntimeEnvVarsMetrics {
+		rmEnvVarMetrics = goRuntimeEnvVarsMetrics()
+		rmEnvVarsDescriptions = bestEffortLookupRM(rmNamesForEnvVarsMetrics)
+
+		// Check if metric was not exposed before and if not, add to sampleBuf.
+		for _, rnevDesc := range rmEnvVarsDescriptions {
+			if _, ok := sampleMap[rnevDesc.Name]; ok {
+				continue
+			}
+			sampleBuf = append(sampleBuf, metrics.Sample{Name: rnevDesc.Name})
+			sampleMap[rnevDesc.Name] = &sampleBuf[len(sampleBuf)-1]
+		}
+	}
 	return &goCollector{
 		base:                   newBaseGoCollector(),
 		sampleBuf:              sampleBuf,
@@ -281,6 +308,8 @@ func NewGoCollector(opts ...func(o *internal.GoCollectorOptions)) Collector {
 		rmExactSumMapForHist:   opt.RuntimeMetricSumForHist,
 		msMetrics:              msMetrics,
 		msMetricsEnabled:       !opt.DisableMemStatsLikeMetrics,
+		rmEnvVarMetrics:        rmEnvVarMetrics,
+		rmEnvVarMetricsEnabled: !opt.DisableRuntimeEnvVarsMetrics,
 	}
 }
 

prometheus/go_collector_latest_test.go

@@ -54,9 +54,6 @@ func expectedBaseMetrics() map[string]struct{} {
 		b.goroutinesDesc.fqName,
 		b.gcLastTimeDesc.fqName,
 		b.threadsDesc.fqName,
-		b.goMaxProcs.fqName,
-		b.goGogcPercent.fqName,
-		b.goMemLimit.fqName,
 	} {
 		metrics[m] = struct{}{}
 	}

prometheus/internal/go_collector_options.go

@@ -29,4 +29,5 @@ type GoCollectorOptions struct {
 	DisableMemStatsLikeMetrics   bool
 	RuntimeMetricSumForHist      map[string]string
 	RuntimeMetricRules           []GoCollectorRule
+	DisableRuntimeEnvVarsMetrics bool
 }