Help:    "Time taken by requests served by current MinIO server instance",
			Buckets: []float64{.05, .1, .25, .5, 1, 2.5, 5, 10},
		},
		[]string{"api"},
	)
	bucketHTTPRequestsDuration = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Name:    "s3_ttfb_seconds",
			Help:    "Time taken by requests served by current MinIO server instance per bucket",
			Buckets: []float64{.05, .1, .25, .5, 1, 2.5, 5, 10},
		},

		{"bucket", "dir/", ObjectNotFound{Bucket: "bucket", Object: "dir/"}},
		{"bucket", "dir/obj", nil},
	}

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	// Create an instance of xl backend
	xl, fsDirs, err := prepareErasure16(ctx)
	if err != nil {
		t.Fatal(err)
	}
	defer xl.Shutdown(context.Background())

	err = xl.MakeBucket(ctx, "bucket", MakeBucketOptions{})
	if err != nil {

		return
	}

	acl := &accessControlPolicy{}
	acl.AccessControlList.Grants = append(acl.AccessControlList.Grants, grant{
		Grantee: grantee{
			XMLNS:  "http://www.w3.org/2001/XMLSchema-instance",
			XMLXSI: "CanonicalUser",
			Type:   "CanonicalUser",
		},
		Permission: "FULL_CONTROL",
	})

	if err := xml.NewEncoder(w).Encode(acl); err != nil {

func validateAdminReq(ctx context.Context, w http.ResponseWriter, r *http.Request, actions ...policy.AdminAction) (ObjectLayer, auth.Credentials) {
	// Get current object layer instance.
	objectAPI := newObjectLayerFn()
	if objectAPI == nil || globalNotificationSys == nil {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
		return nil, auth.Credentials{}
	}

type ArrayOf[T RoundTripper] struct {
	aPool sync.Pool // Arrays
	ePool sync.Pool // Elements
}

// NewArrayOf returns a new ArrayOf.
// You must provide a function that returns a new instance of T.
func NewArrayOf[T RoundTripper](newFn func() T) *ArrayOf[T] {
	return &ArrayOf[T]{
		ePool: sync.Pool{New: func() any {
			return newFn()
		}},
	}
}

// New returns a new empty Array.

		sys.arnErrsMap[arn] = arnErrs{
			updateInProgress: v.updateInProgress,
			count:            v.count + 1,
		}
	}
}

// GetRemoteTargetClient returns minio-go client for replication target instance
func (sys *BucketTargetSys) GetRemoteTargetClient(bucket, arn string) *TargetClient {
	sys.RLock()
	tgt := sys.arnRemotesMap[arn]
	sys.RUnlock()

	if tgt.Client != nil {
		return tgt.Client
	}

	return env.Get("KUBERNETES_SERVICE_HOST", "") != ""
}

// IsBOSH returns true if minio is deployed from a bosh package
func IsBOSH() bool {
	// "/var/vcap/bosh" exists in BOSH deployed instance.
	_, err := os.Stat("/var/vcap/bosh")
	if osIsNotExist(err) {
		return false
	}

	// Log error, as we will not propagate it to caller
	internalLogIf(GlobalContext, err)

	return err == nil
}

		dstRecords, err = globalDNSConfig.Get(dstBucket)
		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}

		// Send PutObject request to appropriate instance (in federated deployment)
		core, rerr := getRemoteInstanceClient(r, getHostFromSrv(dstRecords))
		if rerr != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, rerr), r.URL)
			return
		}

		dstRecords, err = globalDNSConfig.Get(dstBucket)
		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}

		// Send PutObject request to appropriate instance (in federated deployment)
		core, rerr := getRemoteInstanceClient(r, getHostFromSrv(dstRecords))
		if rerr != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, rerr), r.URL)
			return
		}

		v T
		e error
	}]
	lastUpdateMs atomic.Int64
	updating     sync.Mutex
}

// New allocates a new cached value instance. Tt must be initialized with
// `.TnitOnce`.
func New[T any]() *Cache[T] {
	return &Cache[T]{}
}

// NewFromFunc allocates a new cached value instance and initializes it with an
// update function, making it ready for use.