Tiers           map[string]madmin.TierConfig `json:"tiers"`
	lastRefreshedAt time.Time                    `msg:"-"`
}

type tierMetrics struct {
	sync.RWMutex  // protects requestsCount only
	requestsCount map[string]struct {
		success int64
		failure int64
	}
	histogram *prometheus.HistogramVec
}

var globalTierMetrics = tierMetrics{
	requestsCount: make(map[string]struct {

 * database load), spawn a thread or queue it for later. (For a convenient way to do this, use an
 * {@link AsyncEventBus}.)
 *
 * <h2>Subscriber Methods</h2>
 *
 * <p>Event subscriber methods must accept only one argument: the event.
 *
 * <p>Subscribers should not, in general, throw. If they do, the EventBus will catch and log the
 * exception. This is rarely the right solution for error handling and should not be relied upon; it

             * array. Incedentally when these andx smbs are created they are not
             * necessarily populated with header data because they're not writing
             * the header, only their body. But for whatever reason one might wish
             * to populate fields if the writeXxx operation needs this header data
             * for whatever reason. I copy over the uid here so it appears correct

        /** Round-robin distribution */
        ROUND_ROBIN,
        /** Least connections */
        LEAST_CONNECTIONS,
        /** Random selection */
        RANDOM,
        /** Failover only (use primary until failure) */
        FAILOVER_ONLY
    }

    /**
     * Represents a group of channels for a single session.
     */
    public static class ChannelGroup {
        private final String sessionId;

        }

        when(mockConfig.getLmHostsFileName()).thenReturn(lmhostsFile.getAbsolutePath());

        // Use getByName to trigger populate
        // Only valid host should be added
        NbtAddress validHost = lmhosts.getByName("VALIDHOST", mockContext);
        assertNotNull(validHost);

        // Invalid entries should not be found or may have incorrect parsing

			nil, nil),
		prometheus.CounterValue,
		float64(connStats.s3InputBytes),
	)
}

// Populates prometheus with bucket usage metrics, this metrics
// is only enabled if scanner is enabled.
func bucketUsageMetricsPrometheus(ch chan<- prometheus.Metric) {
	objLayer := newObjectLayerFn()
	// Service not initialized yet
	if objLayer == nil {
		return
	}

    bytesIn.writeByte(0x0a) // Literal name (len = 10)
    bytesIn.writeUtf8("custom-baz")
    bytesIn.writeByte(0x0d) // Literal value (len = 13)
    bytesIn.writeUtf8("custom-header")

    // Set to only support 110 bytes (enough for 2 headers).
    // Use a new Writer because we don't support change the dynamic table
    // size after Writer constructed.
    val writer = Hpack.Writer(110, false, bytesOut)

  }

  /**
   * Checks that the elements of the iterable are calculated on the fly. Concretely, that means that
   * {@link SuccessorsFunction#successors(Object)} can only be called for a subset of all nodes.
   */
  @Test
  public void forGraph_breadthFirstIterable_emptyGraph() {
    assertEqualCharNodes(

  }

  /**
   * Checks that the elements of the iterable are calculated on the fly. Concretely, that means that
   * {@link SuccessorsFunction#successors(Object)} can only be called for a subset of all nodes.
   */
  @Test
  public void forGraph_breadthFirstIterable_emptyGraph() {
    assertEqualCharNodes(

        when(mockConfig.getPid()).thenReturn(12345);
    }

    @Nested
    @DisplayName("Constructor Tests")
    class ConstructorTests {

        @Test
        @DisplayName("Test constructor with config only")
        void testConstructorWithConfig() {
            testBlock = new TestServerMessageBlock(mockConfig);

            assertEquals(0, testBlock.getCommand());
            assertNull(testBlock.getPath());