feat: Introduce operational metrics in OpenTelemetry Collector

CHANGELOG.md

@@ -59,6 +59,7 @@ To learn more about active deprecations, we recommend checking [GitHub Discussio
 Here is an overview of all new **experimental** features:
 
 - **General**: Add support for formula based evaluation of metric values ([#2440](https://github.com/kedacore/keda/issues/2440)|[#4998](https://github.com/kedacore/keda/pull/4998))
+- **General**: Introduce operational metrics in OpenTelemetry Collector ([#3078](https://github.com/kedacore/keda/issues/3078))
 
 ### Improvements
 - **General**: Add apiserver Prometheus metrics to KEDA Metric Server ([#4460](https://github.com/kedacore/keda/issues/4460))

apis/keda/v1alpha1/scaledobject_webhook.go

@@ -37,7 +37,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/webhook"
 	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
 
-	prommetrics "github.com/kedacore/keda/v2/pkg/prommetrics/webhook"
+	metricscollector "github.com/kedacore/keda/v2/pkg/metricscollector/webhook"
 )
 
 var scaledobjectlog = logf.Log.WithName("scaledobject-validation-webhook")
@@ -95,7 +95,7 @@ func isRemovingFinalizer(so *ScaledObject, old runtime.Object) bool {
 }
 
 func validateWorkload(so *ScaledObject, action string) (admission.Warnings, error) {
-	prommetrics.RecordScaledObjectValidatingTotal(so.Namespace, action)
+	metricscollector.RecordScaledObjectValidatingTotal(so.Namespace, action)
 
 	verifyFunctions := []func(*ScaledObject, string) error{
 		verifyCPUMemoryScalers,
@@ -119,7 +119,7 @@ func verifyTriggers(incomingSo *ScaledObject, action string) error {
 	err := ValidateTriggers(incomingSo.Spec.Triggers)
 	if err != nil {
 		scaledobjectlog.WithValues("name", incomingSo.Name).Error(err, "validation error")
-		prommetrics.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "incorrect-triggers")
+		metricscollector.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "incorrect-triggers")
 	}
 	return err
 }
@@ -170,7 +170,7 @@ func verifyHpas(incomingSo *ScaledObject, action string) error {
 				} else {
 					err = fmt.Errorf("the workload '%s' of type '%s' is already managed by the hpa '%s'", incomingSo.Spec.ScaleTargetRef.Name, incomingSoGckr.GVKString(), hpa.Name)
 					scaledobjectlog.Error(err, "validation error")
-					prommetrics.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "other-hpa")
+					metricscollector.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "other-hpa")
 					return err
 				}
 			}
@@ -212,7 +212,7 @@ func verifyScaledObjects(incomingSo *ScaledObject, action string) error {
 			so.Spec.ScaleTargetRef.Name == incomingSo.Spec.ScaleTargetRef.Name {
 			err = fmt.Errorf("the workload '%s' of type '%s' is already managed by the ScaledObject '%s'", so.Spec.ScaleTargetRef.Name, incomingSoGckr.GVKString(), so.Name)
 			scaledobjectlog.Error(err, "validation error")
-			prommetrics.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "other-scaled-object")
+			metricscollector.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "other-scaled-object")
 			return err
 		}
 	}
@@ -222,7 +222,7 @@ func verifyScaledObjects(incomingSo *ScaledObject, action string) error {
 		_, err = ValidateAndCompileScalingModifiers(incomingSo)
 		if err != nil {
 			scaledobjectlog.Error(err, "error validating ScalingModifiers")
-			prommetrics.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "scaling-modifiers")
+			metricscollector.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "scaling-modifiers")
 
 			return err
 		}
@@ -275,7 +275,7 @@ func verifyCPUMemoryScalers(incomingSo *ScaledObject, action string) error {
 						container.Resources.Requests.Cpu().AsApproximateFloat64() == 0 {
 						err := fmt.Errorf("the scaledobject has a cpu trigger but the container %s doesn't have the cpu request defined", container.Name)
 						scaledobjectlog.Error(err, "validation error")
-						prommetrics.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "missing-requests")
+						metricscollector.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "missing-requests")
 						return err
 					}
 				} else if trigger.Type == memoryString {
@@ -284,7 +284,7 @@ func verifyCPUMemoryScalers(incomingSo *ScaledObject, action string) error {
 						container.Resources.Requests.Memory().AsApproximateFloat64() == 0 {
 						err := fmt.Errorf("the scaledobject has a memory trigger but the container %s doesn't have the memory request defined", container.Name)
 						scaledobjectlog.Error(err, "validation error")
-						prommetrics.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "missing-requests")
+						metricscollector.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "missing-requests")
 						return err
 					}
 				}
@@ -304,7 +304,7 @@ func verifyCPUMemoryScalers(incomingSo *ScaledObject, action string) error {
 			if (scaleToZeroErr && incomingSo.Spec.MinReplicaCount == nil) || (scaleToZeroErr && *incomingSo.Spec.MinReplicaCount == 0) {
 				err := fmt.Errorf("scaledobject has only cpu/memory triggers AND minReplica is 0 (scale to zero doesn't work in this case)")
 				scaledobjectlog.Error(err, "validation error")
-				prommetrics.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "scale-to-zero-requirements-not-met")
+				metricscollector.RecordScaledObjectValidatingErrors(incomingSo.Namespace, action, "scale-to-zero-requirements-not-met")
 				return err
 			}
 		}

cmd/operator/main.go

@@ -42,6 +42,7 @@ import (
 	kedacontrollers "github.com/kedacore/keda/v2/controllers/keda"
 	"github.com/kedacore/keda/v2/pkg/certificates"
 	"github.com/kedacore/keda/v2/pkg/k8s"
+	"github.com/kedacore/keda/v2/pkg/metricscollector"
 	"github.com/kedacore/keda/v2/pkg/metricsservice"
 	"github.com/kedacore/keda/v2/pkg/scaling"
 	kedautil "github.com/kedacore/keda/v2/pkg/util"
@@ -61,6 +62,8 @@ func init() {
 }
 
 func main() {
+	var enablePrometheusMetrics bool
+	var enableOpenTelemetryMetrics bool
 	var metricsAddr string
 	var probeAddr string
 	var metricsServiceAddr string
@@ -75,7 +78,9 @@ func main() {
 	var webhooksServiceName string
 	var enableCertRotation bool
 	var validatingWebhookName string
-	pflag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
+	pflag.BoolVar(&enablePrometheusMetrics, "enable-prometheus-metrics", true, "Enable the prometheus metric of keda-operator.")
+	pflag.BoolVar(&enableOpenTelemetryMetrics, "enable-opentelemetry-metrics", false, "Enable the opentelemetry metric of keda-operator.")
+	pflag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the prometheus metric endpoint binds to.")
 	pflag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
 	pflag.StringVar(&metricsServiceAddr, "metrics-service-bind-address", ":9666", "The address the gRPRC Metrics Service endpoint binds to.")
 	pflag.BoolVar(&enableLeaderElection, "leader-elect", false,
@@ -127,6 +132,11 @@ func main() {
 	cfg.Burst = adapterClientRequestBurst
 	cfg.DisableCompression = disableCompression
 
+	if !enablePrometheusMetrics {
+		metricsAddr = "0"
+	}
+	metricscollector.NewMetricsCollectors(enablePrometheusMetrics, enableOpenTelemetryMetrics)
+
 	mgr, err := ctrl.NewManager(cfg, ctrl.Options{
 		Scheme: scheme,
 		Metrics: server.Options{

config/e2e/patch_operator.yml

@@ -17,3 +17,19 @@
 - op: replace
   path: /spec/template/spec/containers/0/resources/requests/cpu
   value: 500m
+
+- op: add
+  path: /spec/template/spec/containers/0/args/-
+  value: --enable-opentelemetry-metrics=true
+
+- op: add
+  path: /spec/template/spec/containers/0/env/-
+  value:
+    name: OTEL_EXPORTER_OTLP_ENDPOINT
+    value: "http://opentelemetry-collector.default.svc.cluster.local:4318"
+
+- op: add
+  path: /spec/template/spec/containers/0/env/-
+  value:
+    name: OTEL_METRIC_EXPORT_INTERVAL
+    value: "3000"

controllers/keda/clustertriggerauthentication_controller.go

@@ -31,7 +31,7 @@ import (
 
 	kedav1alpha1 "github.com/kedacore/keda/v2/apis/keda/v1alpha1"
 	"github.com/kedacore/keda/v2/pkg/eventreason"
-	"github.com/kedacore/keda/v2/pkg/prommetrics"
+	"github.com/kedacore/keda/v2/pkg/metricscollector"
 )
 
 // ClusterTriggerAuthenticationReconciler reconciles a ClusterTriggerAuthentication object
@@ -97,10 +97,10 @@ func (r *ClusterTriggerAuthenticationReconciler) updatePromMetrics(clusterTrigge
 	defer clusterTriggerAuthPromMetricsLock.Unlock()
 
 	if metricsData, ok := clusterTriggerAuthPromMetricsMap[namespacedName]; ok {
-		prommetrics.DecrementCRDTotal(prommetrics.ClusterTriggerAuthenticationResource, metricsData.namespace)
+		metricscollector.DecrementCRDTotal(metricscollector.ClusterTriggerAuthenticationResource, metricsData.namespace)
 	}
 
-	prommetrics.IncrementCRDTotal(prommetrics.ClusterTriggerAuthenticationResource, clusterTriggerAuth.Namespace)
+	metricscollector.IncrementCRDTotal(metricscollector.ClusterTriggerAuthenticationResource, clusterTriggerAuth.Namespace)
 	clusterTriggerAuthPromMetricsMap[namespacedName] = clusterTriggerAuthMetricsData{namespace: clusterTriggerAuth.Namespace}
 }
 
@@ -110,7 +110,7 @@ func (r *ClusterTriggerAuthenticationReconciler) UpdatePromMetricsOnDelete(names
 	defer clusterTriggerAuthPromMetricsLock.Unlock()
 
 	if metricsData, ok := clusterTriggerAuthPromMetricsMap[namespacedName]; ok {
-		prommetrics.DecrementCRDTotal(prommetrics.ClusterTriggerAuthenticationResource, metricsData.namespace)
+		metricscollector.DecrementCRDTotal(metricscollector.ClusterTriggerAuthenticationResource, metricsData.namespace)
 	}
 
 	delete(clusterTriggerAuthPromMetricsMap, namespacedName)

controllers/keda/scaledjob_controller.go

@@ -41,7 +41,7 @@ import (
 	kedav1alpha1 "github.com/kedacore/keda/v2/apis/keda/v1alpha1"
 	kedacontrollerutil "github.com/kedacore/keda/v2/controllers/keda/util"
 	"github.com/kedacore/keda/v2/pkg/eventreason"
-	"github.com/kedacore/keda/v2/pkg/prommetrics"
+	"github.com/kedacore/keda/v2/pkg/metricscollector"
 	"github.com/kedacore/keda/v2/pkg/scaling"
 	kedastatus "github.com/kedacore/keda/v2/pkg/status"
 )
@@ -327,18 +327,18 @@ func (r *ScaledJobReconciler) updatePromMetrics(scaledJob *kedav1alpha1.ScaledJo
 	metricsData, ok := scaledJobPromMetricsMap[namespacedName]
 
 	if ok {
-		prommetrics.DecrementCRDTotal(prommetrics.ScaledJobResource, metricsData.namespace)
+		metricscollector.DecrementCRDTotal(metricscollector.ScaledJobResource, metricsData.namespace)
 		for _, triggerType := range metricsData.triggerTypes {
-			prommetrics.DecrementTriggerTotal(triggerType)
+			metricscollector.DecrementTriggerTotal(triggerType)
 		}
 	}
 
-	prommetrics.IncrementCRDTotal(prommetrics.ScaledJobResource, scaledJob.Namespace)
+	metricscollector.IncrementCRDTotal(metricscollector.ScaledJobResource, scaledJob.Namespace)
 	metricsData.namespace = scaledJob.Namespace
 
 	triggerTypes := make([]string, len(scaledJob.Spec.Triggers))
 	for _, trigger := range scaledJob.Spec.Triggers {
-		prommetrics.IncrementTriggerTotal(trigger.Type)
+		metricscollector.IncrementTriggerTotal(trigger.Type)
 		triggerTypes = append(triggerTypes, trigger.Type)
 	}
 	metricsData.triggerTypes = triggerTypes
@@ -351,9 +351,9 @@ func (r *ScaledJobReconciler) updatePromMetricsOnDelete(namespacedName string) {
 	defer scaledJobPromMetricsLock.Unlock()
 
 	if metricsData, ok := scaledJobPromMetricsMap[namespacedName]; ok {
-		prommetrics.DecrementCRDTotal(prommetrics.ScaledJobResource, metricsData.namespace)
+		metricscollector.DecrementCRDTotal(metricscollector.ScaledJobResource, metricsData.namespace)
 		for _, triggerType := range metricsData.triggerTypes {
-			prommetrics.DecrementTriggerTotal(triggerType)
+			metricscollector.DecrementTriggerTotal(triggerType)
 		}
 	}
 

controllers/keda/scaledobject_controller.go

@@ -46,7 +46,7 @@ import (
 	kedacontrollerutil "github.com/kedacore/keda/v2/controllers/keda/util"
 	"github.com/kedacore/keda/v2/pkg/common/message"
 	"github.com/kedacore/keda/v2/pkg/eventreason"
-	"github.com/kedacore/keda/v2/pkg/prommetrics"
+	"github.com/kedacore/keda/v2/pkg/metricscollector"
 	"github.com/kedacore/keda/v2/pkg/scaling"
 	kedastatus "github.com/kedacore/keda/v2/pkg/status"
 )
@@ -564,18 +564,18 @@ func (r *ScaledObjectReconciler) updatePromMetrics(scaledObject *kedav1alpha1.Sc
 	metricsData, ok := scaledObjectPromMetricsMap[namespacedName]
 
 	if ok {
-		prommetrics.DecrementCRDTotal(prommetrics.ScaledObjectResource, metricsData.namespace)
+		metricscollector.DecrementCRDTotal(metricscollector.ScaledObjectResource, metricsData.namespace)
 		for _, triggerType := range metricsData.triggerTypes {
-			prommetrics.DecrementTriggerTotal(triggerType)
+			metricscollector.DecrementTriggerTotal(triggerType)
 		}
 	}
 
-	prommetrics.IncrementCRDTotal(prommetrics.ScaledObjectResource, scaledObject.Namespace)
+	metricscollector.IncrementCRDTotal(metricscollector.ScaledObjectResource, scaledObject.Namespace)
 	metricsData.namespace = scaledObject.Namespace
 
 	triggerTypes := make([]string, len(scaledObject.Spec.Triggers))
 	for _, trigger := range scaledObject.Spec.Triggers {
-		prommetrics.IncrementTriggerTotal(trigger.Type)
+		metricscollector.IncrementTriggerTotal(trigger.Type)
 		triggerTypes = append(triggerTypes, trigger.Type)
 	}
 	metricsData.triggerTypes = triggerTypes
@@ -588,9 +588,9 @@ func (r *ScaledObjectReconciler) updatePromMetricsOnDelete(namespacedName string
 	defer scaledObjectPromMetricsLock.Unlock()
 
 	if metricsData, ok := scaledObjectPromMetricsMap[namespacedName]; ok {
-		prommetrics.DecrementCRDTotal(prommetrics.ScaledObjectResource, metricsData.namespace)
+		metricscollector.DecrementCRDTotal(metricscollector.ScaledObjectResource, metricsData.namespace)
 		for _, triggerType := range metricsData.triggerTypes {
-			prommetrics.DecrementTriggerTotal(triggerType)
+			metricscollector.DecrementTriggerTotal(triggerType)
 		}
 	}
 

controllers/keda/triggerauthentication_controller.go

@@ -31,7 +31,7 @@ import (
 
 	kedav1alpha1 "github.com/kedacore/keda/v2/apis/keda/v1alpha1"
 	"github.com/kedacore/keda/v2/pkg/eventreason"
-	"github.com/kedacore/keda/v2/pkg/prommetrics"
+	"github.com/kedacore/keda/v2/pkg/metricscollector"
 )
 
 // TriggerAuthenticationReconciler reconciles a TriggerAuthentication object
@@ -98,10 +98,10 @@ func (r *TriggerAuthenticationReconciler) updatePromMetrics(triggerAuth *kedav1a
 	defer triggerAuthPromMetricsLock.Unlock()
 
 	if metricsData, ok := triggerAuthPromMetricsMap[namespacedName]; ok {
-		prommetrics.DecrementCRDTotal(prommetrics.TriggerAuthenticationResource, metricsData.namespace)
+		metricscollector.DecrementCRDTotal(metricscollector.TriggerAuthenticationResource, metricsData.namespace)
 	}
 
-	prommetrics.IncrementCRDTotal(prommetrics.TriggerAuthenticationResource, triggerAuth.Namespace)
+	metricscollector.IncrementCRDTotal(metricscollector.TriggerAuthenticationResource, triggerAuth.Namespace)
 	triggerAuthPromMetricsMap[namespacedName] = triggerAuthMetricsData{namespace: triggerAuth.Namespace}
 }
 
@@ -111,7 +111,7 @@ func (r *TriggerAuthenticationReconciler) UpdatePromMetricsOnDelete(namespacedNa
 	defer triggerAuthPromMetricsLock.Unlock()
 
 	if metricsData, ok := triggerAuthPromMetricsMap[namespacedName]; ok {
-		prommetrics.DecrementCRDTotal(prommetrics.TriggerAuthenticationResource, metricsData.namespace)
+		metricscollector.DecrementCRDTotal(metricscollector.TriggerAuthenticationResource, metricsData.namespace)
 	}
 
 	delete(triggerAuthPromMetricsMap, namespacedName)

go.mod

@@ -80,6 +80,9 @@ require (
 	github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a
 	go.etcd.io/etcd/client/v3 v3.5.9
 	go.mongodb.org/mongo-driver v1.12.1
+	go.opentelemetry.io/otel v1.16.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v0.39.0
+	go.opentelemetry.io/otel/metric v1.16.0
 	golang.org/x/oauth2 v0.12.0
 	golang.org/x/sync v0.3.0
 	google.golang.org/api v0.142.0
@@ -104,6 +107,8 @@ require (
 	sigs.k8s.io/kustomize/kustomize/v5 v5.1.1
 )
 
+require go.opentelemetry.io/otel/exporters/otlp/otlpmetric v0.39.0 // indirect
+
 replace (
 	// we need a version with license
 	github.com/chzyer/logex => github.com/chzyer/logex v1.2.1
@@ -287,15 +292,14 @@ require (
 	go.etcd.io/etcd/api/v3 v3.5.9 // indirect
 	go.etcd.io/etcd/client/pkg/v3 v3.5.9 // indirect
 	go.opencensus.io v0.24.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.40.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.40.0 // indirect
-	go.opentelemetry.io/otel v1.14.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.14.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.14.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.42.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.42.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.16.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.16.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.14.0 // indirect
-	go.opentelemetry.io/otel/metric v0.37.0 // indirect
-	go.opentelemetry.io/otel/sdk v1.14.0 // indirect
-	go.opentelemetry.io/otel/trace v1.14.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.16.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v0.39.0
+	go.opentelemetry.io/otel/trace v1.16.0 // indirect
 	go.opentelemetry.io/proto/otlp v0.19.0 // indirect
 	go.starlark.net v0.0.0-20200306205701-8dd3e2ee1dd5 // indirect
 	go.uber.org/atomic v1.11.0 // indirect