// re-acquire conflicting fields owned by other people.
  optional bool force = 2;

  // fieldManager is a name associated with the actor or entity
  // that is making these changes. The value must be less than or
  // 128 characters long, and only contain printable characters,
  // as defined by https://golang.org/pkg/unicode/#IsPrint. This
  // field is required.
  optional string fieldManager = 3;
}

  // +optional
  optional string reason = 2;

  // AuditAnnotations will be added to the attributes object of the
  // admission controller request using 'AddAnnotation'.  The keys should
  // be prefix-less (i.e., the admission controller will add an
  // appropriate prefix).
  // +optional
  map<string, string> auditAnnotations = 3;

  // It must be greater than zero
  optional int32 value = 2;

  // periodSeconds specifies the window of time for which the policy should hold true.
  // PeriodSeconds must be greater than zero and less than or equal to 1800 (30 min).
  optional int32 periodSeconds = 3;
}

// HPAScalingRules configures the scaling behavior for one direction.

The `controllers` package offers a variety of helpers for writing controllers.
These operate in a similar manner as [`controller-runtime`](https://github.com/kubernetes-sigs/controller-runtime) but are *far* smaller and less abstract.

With a few exceptions, Istio controllers typically are split in two phases: construction and running.

  // messageExpression has access to all the same variables as the `expression` except for 'authorizer' and 'authorizer.requestResource'.
  // Example:
  // "object.x must be less than max ("+string(params.max)+")"
  // +optional
  optional string messageExpression = 4;