optional ScaleSpec spec = 2;

  // current status of the scale. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status. Read-only.
  // +optional
  optional ScaleStatus status = 3;
}

// describes the attributes of a scale subresource
message ScaleSpec {
  // desired number of instances for the scaled object.
  // +optional
  optional int32 replicas = 1;
}

  // continuing. When scaling down, the pods are removed in the opposite order.
  // The alternative policy is `Parallel` which will create pods in parallel
  // to match the desired scale without waiting, and on scale down will delete
  // all pods at once.
  // +optional
  optional string podManagementPolicy = 6;

  // updateStrategy indicates the StatefulSetUpdateStrategy that will be

#### Endpoints

Endpoints have an optimized code path, as they are by far the most frequently updated resource - in a steady cluster, this will often be the *only* change, caused by scale up/down.

As a result, they do not go through `PushContext`, and changes do not trigger a `PushContext` recomputation. Instead, the current state is incrementally computed based on events from `ServiceDiscovery`.

#### Conclusion

NAME       CLUSTER      CDS       LDS        EDS       RDS        ECDS         ISTIOD      VERSION

proxy1     cluster1     STALE                          SYNCED       SYNCED                         NOT SENT     NOT SENT     istiod1     1.1
proxy2     cluster2     STALE                          SYNCED       STALE                          SYNCED       NOT SENT     istiod2     1.1
proxy3     cluster3     STALE (Never Acknowledged)     NOT SENT     STALE (Never Acknowledged)     SYNCED       NOT SENT     istiod3     1.1

NAME       CLUSTER      CDS       LDS        EDS       RDS        ECDS         ISTIOD      VERSION

proxy1     cluster1     STALE        SYNCED      SYNCED      NOT SENT     SYNCED       istiod1     1.20
proxy2     cluster2     STALE        SYNCED      STALE       SYNCED       STALE        istiod2     1.19
proxy3     cluster3     NOT SENT     ERROR       STALE       NOT SENT     NOT SENT     istiod3     1.20

						clusterID:      "cluster2",
						version:        "1.19",
						cdsSyncStatus:  status.ConfigStatus_STALE,
						ldsSyncStatus:  status.ConfigStatus_SYNCED,
						rdsSyncStatus:  status.ConfigStatus_SYNCED,
						edsSyncStatus:  status.ConfigStatus_STALE,
						ecdsSyncStatus: status.ConfigStatus_STALE,
					},
				}),
				"istiod3": xdsResponseInput("istiod3", []clientConfigInput{
					{
						proxyID:        "proxy3",

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