// +optional
  // +mapType=atomic
  map<string, string> selector = 2;

  // label selector for pods that should match the replicas count. This is a serializated
  // version of both map-based and more expressive set-based selectors. This is done to
  // avoid introspection in the clients. The string will be in the same format as the
  // query-param syntax. If the target type only supports map-based selectors, both this

  // `handSize` must be no larger than `queues`, and should be
  // significantly smaller (so that a few heavy flows do not
  // saturate most of the queues).  See the user-facing
  // documentation for more extensive guidance on setting this
  // field.  This field has a default value of 8.
  // +optional
  optional int32 handSize = 2;

  // `queueLengthLimit` is the maximum number of requests allowed to

  // `handSize` must be no larger than `queues`, and should be
  // significantly smaller (so that a few heavy flows do not
  // saturate most of the queues).  See the user-facing
  // documentation for more extensive guidance on setting this
  // field.  This field has a default value of 8.
  // +optional
  optional int32 handSize = 2;

  // `queueLengthLimit` is the maximum number of requests allowed to

    df("Discovery Filter")

    axc("Auto Export Controller")

    mcfg("Mesh Config")
    dfc("Default Revision Controller")
```

As you can see, the landscape of controllers is pretty extensive at this point.

[Service Discovery](#ServiceDiscovery) and [Config Store](#ConfigStore) were already discussed above, so do not need more explanation here.

#### Mesh Config

  // +optional
  // +mapType=atomic
  map<string, string> selector = 2;

  // label selector for pods that should match the replicas count. This is a serializated
  // version of both map-based and more expressive set-based selectors. This is done to
  // avoid introspection in the clients. The string will be in the same format as the
  // query-param syntax. If the target type only supports map-based selectors, both this

  // `handSize` must be no larger than `queues`, and should be
  // significantly smaller (so that a few heavy flows do not
  // saturate most of the queues).  See the user-facing
  // documentation for more extensive guidance on setting this
  // field.  This field has a default value of 8.
  // +optional
  optional int32 handSize = 2;

  // `queueLengthLimit` is the maximum number of requests allowed to

  // `handSize` must be no larger than `queues`, and should be
  // significantly smaller (so that a few heavy flows do not
  // saturate most of the queues).  See the user-facing
  // documentation for more extensive guidance on setting this
  // field.  This field has a default value of 8.
  // +optional
  optional int32 handSize = 2;

  // `queueLengthLimit` is the maximum number of requests allowed to

  // +optional
  map<string, string> selector = 2;

  // targetSelector is the label selector for pods that should match the replicas count. This is a serializated
  // version of both map-based and more expressive set-based selectors. This is done to
  // avoid introspection in the clients. The string will be in the same format as the
  // query-param syntax. If the target type only supports map-based selectors, both this