usageTotalBytesMD = NewGaugeMD(usageTotalBytes,
		"Total cluster usage in bytes")
	usageObjectsCountMD = NewGaugeMD(usageObjectsCount,
		"Total cluster objects count")
	usageVersionsCountMD = NewGaugeMD(usageVersionsCount,
		"Total cluster object versions (including delete markers) count")
	usageDeleteMarkersCountMD = NewGaugeMD(usageDeleteMarkersCount,
		"Total cluster delete markers count")
	usageBucketsCountMD = NewGaugeMD(usageBucketsCount,

  CheckRemoteMatMulExecutesOK(ctx, remote_device_name, local_device_name);

  // Adding a non-existent remote worker to cluster def. This should cause the
  // UpdateServerDef call to fail.
  tensorflow::ClusterDef* cluster_def = server_def.mutable_cluster();
  tensorflow::JobDef* job_def = cluster_def->mutable_job(0);
  int port = tensorflow::testing::PickUnusedPortOrDie();
  job_def->mutable_tasks()->insert(

)

// loadClusterNotificationMetrics - `MetricsLoaderFn` for cluster notification metrics.
func loadClusterNotificationMetrics(_ context.Context, m MetricValues, _ *metricsCache) error {
	if globalEventNotifier == nil {
		return nil
	}

	nstats := globalEventNotifier.targetList.Stats()

		targetID)
	auditTotalMessagesMD = NewCounterMD(auditTotalMessages,
		"Total number of messages sent since start",
		targetID)
)

// loadClusterAuditMetrics - `MetricsLoaderFn` for cluster audit
// such as failed messages and total messages.
func loadClusterAuditMetrics(_ context.Context, m MetricValues, c *metricsCache) error {
	audit := logger.CurrentStats()
	for id, st := range audit {

	syncSuccessesMD                          = NewCounterMD(syncSuccesses, "Number of successful IAM data syncs since server start.")
)

// loadClusterIAMMetrics - `MetricsLoaderFn` for cluster IAM metrics.
func loadClusterIAMMetrics(_ context.Context, m MetricValues, _ *metricsCache) error {
	m.Set(lastSyncDurationMillis, float64(atomic.LoadUint64(&globalIAMSys.LastRefreshDurationMilliseconds)))

		poolIDL, setIDL)
)

func b2f(v bool) float64 {
	if v {
		return 1
	}
	return 0
}

// loadClusterErasureSetMetrics - `MetricsLoaderFn` for cluster storage erasure
// set metrics.
func loadClusterErasureSetMetrics(ctx context.Context, m MetricValues, c *metricsCache) error {
	result, _ := c.esetHealthResult.Get()

      healthStatus: HEALTHY
      loadBalancingWeight: 1
    locality: {}
  policy:
    overprovisioningFactor: 140
- clusterName: outbound|9402||cert-manager-istio-csr-metrics.cert-manager.svc.cluster.local
  endpoints:
  - lbEndpoints:
    - endpoint:
        address:
          socketAddress:
            address: 10.244.0.156
            portValue: 9402
        healthCheckConfig: {}

    },
    {
      "identity": "spiffe://cluster.local/ns/istio-system/sa/ztunnel",
      "state": "Initializing",
      "certChain": []
    },
    {
      "identity": "spiffe://cluster.local/ns/istio-system/sa/another-sa",
      "state": "Unavailable: the identity is no longer needed",
      "certChain": []
    },
    {
      "identity": "spiffe://cluster.local/ns/istio-system/sa/istiod",

  periodSeconds: 15
  timeoutSeconds: 10
  successThreshold: 1
  failureThreshold: 3
```

## Cluster probe

### Cluster-writeable probe

The reply is '200 OK' if cluster has write quorum if not it returns '503 Service Unavailable'.

```
curl http://minio1:9001/minio/health/cluster
HTTP/1.1 503 Service Unavailable
Accept-Ranges: bytes
Content-Length: 0
Server: MinIO
Vary: Origin

| `minio_cluster_health_drives_count`                | `gauge` | Count of all drives in the cluster             |        |
| `minio_cluster_health_nodes_offline_count`         | `gauge` | Count of offline nodes in the cluster          |        |
| `minio_cluster_health_nodes_online_count`          | `gauge` | Count of online nodes in the cluster           |        |