*
 * <p>Some uses of this class include
 *
 * <ul>
 *   <li>As a method return type, as an alternative to returning {@code null} to indicate that no
 *       value was available
 *   <li>To distinguish between "unknown" (for example, not present in a map) and "known to have no
 *       value" (present in the map, with value {@code Optional.absent()})

	if err != nil {
		if _, ok := err.(ObjectNotFound); !ok {
			t.Errorf("Expect %v but received %v", ObjectNotFound{Bucket: bucket, Object: object}, err)
		}
	}

	// since majority of xl.meta's are not available, object should be successfully deleted.
	_, err = objLayer.GetObjectInfo(ctx, bucket, object, ObjectOptions{})
	if _, ok := err.(ObjectNotFound); !ok {

 *         .build())
 *     .url("http://publicobject.com/helloworld.txt")
 *     .build();
 * ```
 *
 * ## Force a Cache Response
 *
 * Sometimes you'll want to show resources if they are available immediately, but not otherwise.
 * This can be used so your application can show *something* while waiting for the latest data to be
 * downloaded. To restrict a request to locally-cached resources, add the `only-if-cached`

This is consumed in two ways:
* Some components just block on `watcher.WaitForCRD(...)` before doing the work they need.

				Payload: &zdsapi.WorkloadRequest_Add{
					Add: &zdsapi.AddWorkload{
						Uid:          uid,
						WorkloadInfo: wl.Workload,
					},
				},
			}, &fd)
		} else {
			log.Infof("netns is not available for pod, sending 'keep' to ztunnel")
			resp, err = conn.sendMsgAndWaitForAck(&zdsapi.WorkloadRequest{
				Payload: &zdsapi.WorkloadRequest_Keep{
					Keep: &zdsapi.KeepWorkload{
						Uid: uid,
					},
				},

/**
 * Utilities for treating interruptible operations as uninterruptible. In all cases, if a thread is
 * interrupted during such a call, the call continues to block until the result is available or the
 * timeout elapses, and only then re-interrupts the thread.
 *
 * @author Anthony Zana
 * @since 10.0
 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault

      <activation>
        <!--
            In order to build and run the tests against JDK 18+, we need to pass java.security.manager=allow, to make
            the deprecated 'java.lang.SecurityManager' available for use.
         -->
        <jdk>[18,]</jdk>
      </activation>
      <properties>
        <test.add.args>-Djava.security.manager=allow</test.add.args>
      </properties>
    </profile>
  </profiles>

- API
  - Ingress resources are now available via `networking.k8s.io/v1beta1`. Ingress resources in `extensions/v1beta1` are deprecated and will no longer be served in v1.18. Existing persisted data is available via the new API group/version  ([#74057](https://github.com/kubernetes/kubernetes/pull/74057), [@liggitt](https://github.com/liggitt))

* [stable] Expose storage usage metrics

  * The available capacity of a given Persistent Volume (PV) is available by calling the Kubernetes metrics API.

* [stable] Volume plugin metrics

                expectedChecksum = expectedChecksum.substring(lastSpacePos + 1);
            } else {
                // remove everything after the first space (if available)
                int spacePos = expectedChecksum.indexOf(' ');

                if (spacePos != -1) {
                    expectedChecksum = expectedChecksum.substring(0, spacePos);
                }
            }