add support for timing histograms and const labels

Change-Id: I8f77d5e16c01a403c7cfdccec464a81f4e3beba0

test/instrumentation/decode_metric.go

@@ -70,9 +70,9 @@ func (c *metricDecoder) decodeNewMetricCall(fc *ast.CallExpr) (*metric, error) {
 		return nil, nil
 	}
 	switch functionName {
-	case "NewCounter", "NewGauge", "NewHistogram", "NewSummary":
+	case "NewCounter", "NewGauge", "NewHistogram", "NewSummary", "NewTimingHistogram":
 		m, err = c.decodeMetric(fc)
-	case "NewCounterVec", "NewGaugeVec", "NewHistogramVec", "NewSummaryVec":
+	case "NewCounterVec", "NewGaugeVec", "NewHistogramVec", "NewSummaryVec", "NewTimingHistogramVec":
 		m, err = c.decodeMetricVec(fc)
 	case "Labels", "HandlerOpts", "HandlerFor", "HandlerWithReset":
 		return nil, nil
@@ -96,6 +96,8 @@ func getMetricType(functionName string) string {
 		return histogramMetricType
 	case "NewSummary", "NewSummaryVec":
 		return summaryMetricType
+	case "NewTimingHistogram", "NewTimingHistogramVec":
+		return timingRatioHistogram
 	default:
 		panic("getMetricType expects correct function name")
 	}
@@ -295,6 +297,12 @@ func (c *metricDecoder) decodeOpts(expr ast.Expr) (metric, error) {
 				return m, err
 			}
 			m.StabilityLevel = string(*level)
+		case "ConstLabels":
+			labels, err := c.decodeConstLabels(kv.Value)
+			if err != nil {
+				return m, err
+			}
+			m.ConstLabels = labels
 		case "AgeBuckets", "BufCap":
 			uintVal, err := c.decodeUint32(kv.Value)
 			if err != nil {
@@ -558,3 +566,43 @@ func decodeStabilityLevel(expr ast.Expr, metricsFrameworkImportName string) (*me
 	stability := metrics.StabilityLevel(se.Sel.Name)
 	return &stability, nil
 }
+
+func (c *metricDecoder) decodeConstLabels(expr ast.Expr) (map[string]string, error) {
+	retval := map[string]string{}
+	switch v := expr.(type) {
+	case *ast.CompositeLit:
+		for _, e2 := range v.Elts {
+			kv := e2.(*ast.KeyValueExpr)
+			key := ""
+			switch k := kv.Key.(type) {
+
+			case *ast.Ident:
+				variableExpr, found := c.variables[k.Name]
+				if !found {
+					return nil, newDecodeErrorf(expr, errBadVariableAttribute)
+				}
+				bl, ok := variableExpr.(*ast.BasicLit)
+				if !ok {
+					return nil, newDecodeErrorf(expr, errNonStringAttribute)
+				}
+				k2, err := stringValue(bl)
+				if err != nil {
+					return nil, err
+				}
+				key = k2
+			case *ast.BasicLit:
+				k2, err := stringValue(k)
+				if err != nil {
+					return nil, err
+				}
+				key = k2
+			}
+			val, err := stringValue(kv.Value.(*ast.BasicLit))
+			if err != nil {
+				return nil, err
+			}
+			retval[key] = val
+		}
+	}
+	return retval, nil
+}

test/instrumentation/metric.go

@@ -21,10 +21,11 @@ import (
 )
 
 const (
-	counterMetricType   = "Counter"
-	gaugeMetricType     = "Gauge"
-	histogramMetricType = "Histogram"
-	summaryMetricType   = "Summary"
+	counterMetricType    = "Counter"
+	gaugeMetricType      = "Gauge"
+	histogramMetricType  = "Histogram"
+	summaryMetricType    = "Summary"
+	timingRatioHistogram = "TimingRatioHistogram"
 )
 
 type metric struct {
@@ -41,6 +42,7 @@ type metric struct {
 	AgeBuckets        uint32              `yaml:"ageBuckets,omitempty"`
 	BufCap            uint32              `yaml:"bufCap,omitempty"`
 	MaxAge            int64               `yaml:"maxAge,omitempty"`
+	ConstLabels       map[string]string   `yaml:"constLabels,omitempty"`
 }
 
 func (m metric) buildFQName() string {

test/instrumentation/testdata/pkg/kubelet/metrics/metrics.go

@@ -63,6 +63,16 @@ const (
 	RunPodSandboxErrorsKey   = "run_podsandbox_errors_total"
 )
 
+const (
+	requestKind         = "request_kind"
+	priorityLevel       = "priority_level"
+	flowSchema          = "flow_schema"
+	phase               = "phase"
+	LabelNamePhase      = "phase"
+	LabelValueWaiting   = "waiting"
+	LabelValueExecuting = "executing"
+)
+
 var (
 	defObjectives = map[float64]float64{0.5: 0.5, 0.75: 0.75}
 	testBuckets   = []float64{0, 0.5, 1.0}
@@ -131,6 +141,35 @@ var (
 			StabilityLevel: metrics.ALPHA,
 		},
 	)
+	// PriorityLevelExecutionSeatsGaugeVec creates observers of seats occupied throughout execution for priority levels
+	PriorityLevelExecutionSeatsGaugeVec = metrics.NewTimingHistogramVec(
+		&metrics.TimingHistogramOpts{
+			Namespace: "namespace",
+			Subsystem: "subsystem",
+			Name:      "priority_level_seat_utilization",
+			Help:      "Observations, at the end of every nanosecond, of utilization of seats for any stage of execution (but only initial stage for WATCHes)",
+			// Buckets for both 0.99 and 1.0 mean PromQL's histogram_quantile will reveal saturation
+			Buckets:        []float64{0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, 0.99, 1},
+			ConstLabels:    map[string]string{phase: "executing"},
+			StabilityLevel: metrics.BETA,
+		},
+		[]string{"priorityLevel"},
+	)
+
+	// PriorityLevelExecutionSeatsGaugeVec creates observers of seats occupied throughout execution for priority levels
+	TestConstLabels = metrics.NewTimingHistogramVec(
+		&metrics.TimingHistogramOpts{
+			Namespace: "test",
+			Subsystem: "const",
+			Name:      "label",
+			Help:      "Observations, at the end of every nanosecond, of utilization of seats for any stage of execution (but only initial stage for WATCHes)",
+			// Buckets for both 0.99 and 1.0 mean PromQL's histogram_quantile will reveal saturation
+			Buckets:        []float64{0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, 0.99, 1},
+			ConstLabels:    map[string]string{"somestring": "executing", phase: "blah"},
+			StabilityLevel: metrics.BETA,
+		},
+		[]string{"priorityLevel"},
+	)
 	// PLEGRelistDuration is a Histogram that tracks the duration (in seconds) it takes for relisting pods in the Kubelet's
 	// Pod Lifecycle Event Generator (PLEG).
 	PLEGRelistDuration = metrics.NewHistogram(

test/instrumentation/testdata/test-stable-metrics-list.yaml

@@ -85,3 +85,54 @@
   - 2.5
   - 5
   - 10
+- name: priority_level_seat_utilization
+  subsystem: subsystem
+  namespace: namespace
+  help: Observations, at the end of every nanosecond, of utilization of seats for
+    any stage of execution (but only initial stage for WATCHes)
+  type: TimingRatioHistogram
+  stabilityLevel: BETA
+  labels:
+  - priorityLevel
+  buckets:
+  - 0
+  - 0.1
+  - 0.2
+  - 0.3
+  - 0.4
+  - 0.5
+  - 0.6
+  - 0.7
+  - 0.8
+  - 0.9
+  - 0.95
+  - 0.99
+  - 1
+  constLabels:
+    phase: executing
+- name: label
+  subsystem: const
+  namespace: test
+  help: Observations, at the end of every nanosecond, of utilization of seats for
+    any stage of execution (but only initial stage for WATCHes)
+  type: TimingRatioHistogram
+  stabilityLevel: BETA
+  labels:
+  - priorityLevel
+  buckets:
+  - 0
+  - 0.1
+  - 0.2
+  - 0.3
+  - 0.4
+  - 0.5
+  - 0.6
+  - 0.7
+  - 0.8
+  - 0.9
+  - 0.95
+  - 0.99
+  - 1
+  constLabels:
+    phase: blah
+    somestring: executing