osMetricAccess
	osMetricCreate
	osMetricReadDirent
	osMetricFdatasync
	osMetricSync

	// .... add more

	osMetricLast
)

var globalOSMetrics osMetrics

func init() {
	// Inject metrics.
	ioutilx.OsOpenFile = OpenFile
	ioutilx.OpenFileDirectIO = OpenFileDirectIO
	ioutilx.OsOpen = Open
}

type osMetrics struct {
	// All fields must be accessed atomically and aligned.

// LocalStorageInfo - fetch server information for a remote node.
func (client *peerRESTClient) LocalStorageInfo(ctx context.Context, metrics bool) (info StorageInfo, err error) {
	resp, err := localStorageInfoRPC.Call(ctx, client.gridConn(), grid.NewMSSWith(map[string]string{
		peerRESTMetrics: strconv.FormatBool(metrics),
	}))
	return resp.ValueOrZero(), err
}

// ServerInfo - fetch server information for a remote node.

	},
	{
		api:     "cors",
		methods: []string{http.MethodPut, http.MethodDelete},
		queries: []string{"cors", ""},
	},
	{
		api:     "metrics",
		methods: []string{http.MethodGet, http.MethodPut, http.MethodDelete},
		queries: []string{"metrics", ""},
	},
	{
		api:     "website",
		methods: []string{http.MethodPut},
		queries: []string{"website", ""},
	},
	{
		api:     "logging",

	// Allocated etcd endpoint for config and bucket DNS.
	globalEtcdClient *etcd.Client

	// Cluster replication manager.
	globalSiteReplicationSys SiteReplicationSys

	// Cluster replication resync metrics
	globalSiteResyncMetrics *siteResyncMetrics

	// Is set to true when Bucket federation is requested
	// and is 'true' when etcdConfig.PathPrefix is empty
	globalBucketFederation bool

## Urgent Upgrade Notes 

### (No, really, you MUST read this before you upgrade)

- For metrics `apiserver_cache_list_fetched_objects_total`, `apiserver_cache_list_returned_objects_total`, `apiserver_cache_list_total` replace `resource_prefix` label with API `group` and `resource` labels.

* The IP address and port for kube-proxy metrics server is now configurable via flag `--metrics-bind-address` ([#48625](https://github.com/kubernetes/kubernetes/pull/48625), [@mrhohn](https://github.com/mrhohn))
  * Special notice for kube-proxy in 1.7+ (including 1.7.0):
    * Healthz server (/healthz) will be served on 0.0.0.0:10256 by default.
    * Metrics server (/metrics and /proxyMode) will be served on 127.0.0.1:10249 by default.

evicts pods from nodes in preparation for disruptive operations like kernel
upgrades or maintenance.
     * Custom Metrics for Autoscaling (HorizontalPodAutoscaler API in the Autoscaling
API group): The Horizontal Pod Autoscaling feature now supports custom metrics
(Alpha), allowing you to specify application-level metrics and thresholds to
trigger scaling up and down the number of pods in your application.

	}

	// Add Admin router, all APIs are enabled in server mode.
	registerAdminRouter(router, true)

	// Add healthCheck router
	registerHealthCheckRouter(router)

	// Add server metrics router
	registerMetricsRouter(router)

	// Add STS router always.
	registerSTSRouter(router)

	// Add KMS router
	registerKMSRouter(router)

	// Add API router
	registerAPIRouter(router)

### Pod resource metrics

On-demand metrics calculation is now available through `/metrics/resources`. [When enabled](
https://docs.k8s.io/concepts/cluster-administration/system-metrics#kube-scheduler-metrics), the endpoint will report the requested resources and the desired limits of all running pods.

### Introducing `RootCAConfigMap`

        build/tmp/teŝt files/** => $HIDDEN_ARTIFACT_DESTINATION/teŝt-files
        build/errorLogs/** => $HIDDEN_ARTIFACT_DESTINATION/errorLogs
        artifact-cache-metrics => artifact-cache-metrics
        artifact-cache-report => artifact-cache-report
        build/reports/configuration-cache/**/configuration-cache-report.html