Add the pod_resources_endpoint_requests_total metric

pkg/kubelet/apis/podresources/BUILD

@@ -12,6 +12,7 @@ go_library(
     importpath = "k8s.io/kubernetes/pkg/kubelet/apis/podresources",
     visibility = ["//visibility:public"],
     deps = [
+        "//pkg/kubelet/metrics:go_default_library",
         "//pkg/kubelet/util:go_default_library",
         "//staging/src/k8s.io/api/core/v1:go_default_library",
         "//staging/src/k8s.io/kubelet/pkg/apis/podresources/v1:go_default_library",

pkg/kubelet/apis/podresources/server_v1.go

@@ -19,6 +19,8 @@ package podresources
 import (
 	"context"
 
+	"k8s.io/kubernetes/pkg/kubelet/metrics"
+
 	"k8s.io/kubelet/pkg/apis/podresources/v1"
 	"k8s.io/kubelet/pkg/apis/podresources/v1alpha1"
 )
@@ -50,6 +52,8 @@ func alphaDevicesToV1(alphaDevs []*v1alpha1.ContainerDevices) []*v1.ContainerDev
 
 // List returns information about the resources assigned to pods on the node
 func (p *v1PodResourcesServer) List(ctx context.Context, req *v1.ListPodResourcesRequest) (*v1.ListPodResourcesResponse, error) {
+	metrics.PodResourcesEndpointRequestsTotalCount.WithLabelValues("v1").Inc()
+
 	pods := p.podsProvider.GetPods()
 	podResources := make([]*v1.PodResources, len(pods))
 	p.devicesProvider.UpdateAllocatedDevices()

pkg/kubelet/apis/podresources/server_v1alpha1.go

@@ -19,6 +19,8 @@ package podresources
 import (
 	"context"
 
+	"k8s.io/kubernetes/pkg/kubelet/metrics"
+
 	"k8s.io/kubelet/pkg/apis/podresources/v1alpha1"
 )
 
@@ -39,6 +41,7 @@ func NewV1alpha1PodResourcesServer(podsProvider PodsProvider, devicesProvider De
 
 // List returns information about the resources assigned to pods on the node
 func (p *v1alpha1PodResourcesServer) List(ctx context.Context, req *v1alpha1.ListPodResourcesRequest) (*v1alpha1.ListPodResourcesResponse, error) {
+	metrics.PodResourcesEndpointRequestsTotalCount.WithLabelValues("v1alpha1").Inc()
 	pods := p.podsProvider.GetPods()
 	podResources := make([]*v1alpha1.PodResources, len(pods))
 	p.devicesProvider.UpdateAllocatedDevices()

pkg/kubelet/metrics/metrics.go

@@ -60,6 +60,8 @@ const (
 	// Metrics keys of device plugin operations
 	DevicePluginRegistrationCountKey  = "device_plugin_registration_total"
 	DevicePluginAllocationDurationKey = "device_plugin_alloc_duration_seconds"
+	// Metrics keys of pod resources operations
+	PodResourcesEndpointRequestsTotalKey = "pod_resources_endpoint_requests_total"
 
 	// Metric keys for node config
 	AssignedConfigKey             = "node_config_assigned"
@@ -277,6 +279,18 @@ var (
 		[]string{"resource_name"},
 	)
 
+	// PodResourcesEndpointRequestsTotalCount is a Counter that tracks the cumulative number of requests to the PodResource endpoints.
+	// Broken down by server API version.
+	PodResourcesEndpointRequestsTotalCount = metrics.NewCounterVec(
+		&metrics.CounterOpts{
+			Subsystem:      KubeletSubsystem,
+			Name:           PodResourcesEndpointRequestsTotalKey,
+			Help:           "Cumulative number of requests to the PodResource endpoint. Broken down by server api version.",
+			StabilityLevel: metrics.ALPHA,
+		},
+		[]string{"server_api_version"},
+	)
+
 	// Metrics for node config
 
 	// AssignedConfig is a Gauge that is set 1 if the Kubelet has a NodeConfig assigned.