Prometheus AlertManager is the component that manages sending, inhibition and silencing of the alerts generated from Prometheus. The AlertManager can be configured to send alerts to variety of receivers. Refer [Prometheus AlertManager receivers](https://prometheus.io/docs/alerting/latest/configuration/#receiver) for more details.

Follow below steps to enable and use AlertManager.

## Deploy and start AlertManager

  @SuppressWarnings({"unchecked", "nullness"})
  @CanIgnoreReturnValue
  public final @Nullable R invoke(@Nullable T receiver, @Nullable Object... args)
      throws InvocationTargetException, IllegalAccessException {
    return (R) invokeInternal(receiver, checkNotNull(args));
  }

  /** Returns the return type of this {@code Invokable}. */

import static com.google.common.truth.Truth.assertThat;
import static java.lang.Math.min;
import static java.util.Arrays.asList;

import com.google.common.cache.CacheTesting.Receiver;
import com.google.common.cache.TestingCacheLoaders.IdentityLoader;
import com.google.common.cache.TestingRemovalListeners.CountingRemovalListener;
import java.util.List;
import java.util.Set;

// each authentication attempt.
type XDGSCRAMClient struct {
	*scram.Client
	*scram.ClientConversation
	scram.HashGeneratorFcn
}

// Begin constructs a SCRAM client component based on a given hash.Hash
// factory receiver.  This constructor will normalize the username, password
// and authzID via the SASLprep algorithm, as recommended by RFC-5802.  If
// SASLprep fails, the method returns an error.

// each authentication attempt.
type XDGSCRAMClient struct {
	*scram.Client
	*scram.ClientConversation
	scram.HashGeneratorFcn
}

// Begin constructs a SCRAM client component based on a given hash.Hash
// factory receiver.  This constructor will normalize the username, password
// and authzID via the SASLprep algorithm, as recommended by RFC-5802.  If
// SASLprep fails, the method returns an error.

// m.Payload is length 0, but not nil.
func (m *message) setZeroPayloadFlag() {
	m.Flags &^= FlagPayloadIsZero
	if len(m.Payload) == 0 && m.Payload != nil {
		m.Flags |= FlagPayloadIsZero
	}
}

type receiver interface {
	msgp.Unmarshaler
	Op() Op
}

type sender interface {
	msgp.MarshalSizer
	Op() Op
}

type connectReq struct {
	ID    [16]byte
	Host  string
	Time  time.Time

   * identification, or may be used to obtain station status, or both.
   *
   * @since 8.0
   */
  public static final byte ENQ = 5;

  /**
   * Acknowledge: A communication control character transmitted by a receiver as an affirmative
   * response to a sender.
   *
   * @since 8.0
   */
  public static final byte ACK = 6;

  /**

      }
    };
  }

  @J2ktIncompatible
  @GwtIncompatible // java.lang.reflect
  private static Object invokeAccessibleNonThrowingMethod(
      Method method, Object receiver, Object... params) {
    try {
      return method.invoke(receiver, params);
    } catch (IllegalAccessException e) {
      throw new RuntimeException(e);
    } catch (InvocationTargetException e) {
      throw propagate(e.getCause());
    }

// The returned function should always be called to release resources.
// An optional error can be sent which will be picked as text only error,
// without its original type by the receiver.
// waitForHTTPResponse should be used to the receiving side.
func keepHTTPReqResponseAlive(w http.ResponseWriter, r *http.Request) (resp func(error), body io.ReadCloser) {
	bodyDoneCh := make(chan struct{})

            byte[] buffer = new byte[256];
            int bytesWritten = request.writeBytesWireFormat(buffer, 0);

            // Negative value should be written as-is (interpreted as unsigned by receiver)
            assertEquals(-1L, SMBUtil.readInt8(buffer, 8));
        }

        @Test
        @DisplayName("Should handle zero-length read")
        void testZeroLengthRead() {