tagLabel := hook.GetLabels()[IstioTagLabel]
		ri, revPresent := revisions[rev]
		if revPresent {
			if tagLabel != "" {
				ri.Webhooks = append(ri.Webhooks, &MutatingWebhookConfigInfo{
					Name:     hook.Name,
					Revision: rev,
					Tag:      tagLabel,
				})
			}
		} else {
			revisions[rev] = &RevisionDescription{
				IstioOperatorCRs: []*IstioOperatorCRInfo{},

		updateRevision = revisions[revisionCount-1]
	} else if equalCount > 0 {
		// if the equivalent revision is not immediately prior we will roll back by incrementing the
		// Revision of the equivalent revision
		updateRevision, err = ssc.controllerHistory.UpdateControllerRevision(
			equalRevisions[equalCount-1],
			updateRevision.Revision)
		if err != nil {

				NoCleanup:         true,
			},
			expectErr: true,
		},
		{
			name: "fail on both revision and revisions flag",
			settings: &Settings{
				Revision:      "a",
				Compatibility: false,
				Revisions: RevVerMap{
					"b": "",
				},
			},
			expectErr: true,
		},
		{
			name: "fail when compatibility mode but no revisions",
			settings: &Settings{
				Compatibility: true,
			},
			expectErr: true,
		},

	}

	if s.Revision != "" {
		if s.Revisions != nil {
			return fmt.Errorf("cannot use --istio.test.revision and --istio.test.revisions at the same time," +
				" --istio.test.revisions will take precedence and --istio.test.revision will be ignored")
		}
		// use Revision as the sole revision in RevVerMap
		s.Revisions = RevVerMap{
			s.Revision: "",
		}
	} else if s.Revisions != nil {

				for i := range test.existing {
					if test.revision.Name == test.existing[i].revision.Name &&
						test.revision.Namespace == test.existing[i].revision.Namespace {
						found = test.existing[i].revision
						break
					}
				}
				if found == nil {
					return true, nil, errors.NewNotFound(apps.Resource("controllerrevisions"), test.revision.Name)
				}
				b, err := strategicpatch.StrategicMergePatch(

	// Compatibility determines whether we should transparently deploy echo workloads attached to each revision
	// specified in `Revisions` when creating echo instances. Used primarily for compatibility testing between revisions
	// on different control plane versions.
	Compatibility bool

	// Revisions maps the Istio revisions that are available to each cluster to their corresponding versions.

						return fmt.Errorf("validatingwebhookconfiguration not updated yet: %v", err)
					}
					return nil
				})
			}

			revision := "default"
			if t.Settings().Revisions.Default() != "" {
				revision = t.Settings().Revisions.Default()
			}
			verifyRejectsInvalidConfig(t, revision, true)
			verifyRejectsInvalidConfig(t, "", true)
		})
}

	// Second pod, revision "red", steals the leader lock from "green" since it is the default revision
	_, stop2 := createElection(t, "pod2", "red", watcher, true, client)
	// Third pod with revision "red" comes in and cannot take the lock since another revision with "red" has it
	_, stop3 := createElection(t, "pod3", "red", watcher, false, client)

apiVersion: release-notes/v2
kind: bug-fix
area: istioctl
issue:
  - 45242
releaseNotes:
  - |

```yaml
meshConfig:
  accessLogFile: /dev/stdout
```

#### Revisions

Control plane revisions allow deploying multiple versions of the control plane in the same cluster.
This allows safe [canary upgrades](https://istio.io/latest/docs/setup/upgrade/canary/)

```yaml
revision: my-revision-name