// that may be executing at a time --- for each such priority
  // level:
  //
  //             ACV(l) = ceil( SCL * ACS(l) / ( sum[priority levels k] ACS(k) ) )
  //
  // bigger numbers of ACS mean more reserved concurrent requests (at the
  // expense of every other PL).
  // This field has a default value of 30.
  // +optional
  optional int32 assuredConcurrencyShares = 1;

  // that may be executing at a time --- for each such priority
  // level:
  //
  //             ACV(l) = ceil( SCL * ACS(l) / ( sum[priority levels k] ACS(k) ) )
  //
  // bigger numbers of ACS mean more reserved concurrent requests (at the
  // expense of every other PL).
  // This field has a default value of 30.
  // +optional
  optional int32 assuredConcurrencyShares = 1;

  // mounted only with a single SELinux context.
  //
  // When "false", Kubernetes won't pass any special SELinux mount options to the driver.
  // This is typical for volumes that represent subdirectories of a bigger shared filesystem.
  //
  // Default is "false".
  //
  // +featureGate=SELinuxMountReadWriteOncePod
  // +optional
  optional bool seLinuxMount = 8;
}

// in both Up and Down directions (scaleUp and scaleDown fields respectively).
message HorizontalPodAutoscalerBehavior {
  // scaleUp is scaling policy for scaling Up.
  // If not set, the default value is the higher of:
  //   * increase no more than 4 pods per 60 seconds
  //   * double the number of pods per 60 seconds
  // No stabilization is used.
  // +optional
  optional HPAScalingRules scaleUp = 1;

  // mounted only with a single SELinux context.
  //
  // When "false", Kubernetes won't pass any special SELinux mount options to the driver.
  // This is typical for volumes that represent subdirectories of a bigger shared filesystem.
  //
  // Default is "false".
  //
  // +featureGate=SELinuxMountReadWriteOncePod
  // +optional
  optional bool seLinuxMount = 8;
}

components are installed into. Namespace definitions can be defined and specialized at the global, feature and component
level, with each lower level overriding the setting of the higher parent level. For example, if the global default
namespace is defined as:

```yaml
defaultNamespace: istio-system
```

and namespaces are specialized for the gateway feature and its components:

```yaml

  // that may be executing at a time --- for each such priority
  // level:
  //
  //             ACV(l) = ceil( SCL * ACS(l) / ( sum[priority levels k] ACS(k) ) )
  //
  // bigger numbers of ACS mean more reserved concurrent requests (at the
  // expense of every other PL).
  // This field has a default value of 30.
  // +optional
  optional int32 assuredConcurrencyShares = 1;

  // Limited priority levels in proportion to their NCS values:
  //
  // NominalCL(i)  = ceil( ServerCL * NCS(i) / sum_ncs )
  // sum_ncs = sum[limited priority level k] NCS(k)
  //
  // Bigger numbers mean a larger nominal concurrency limit,
  // at the expense of every other Limited priority level.
  // This field has a default value of 30.
  // +optional
  optional int32 nominalConcurrencyShares = 1;

// in both Up and Down directions (scaleUp and scaleDown fields respectively).
message HorizontalPodAutoscalerBehavior {
  // scaleUp is scaling policy for scaling Up.
  // If not set, the default value is the higher of:
  //   * increase no more than 4 pods per 60 seconds
  //   * double the number of pods per 60 seconds
  // No stabilization is used.
  // +optional
  optional HPAScalingRules scaleUp = 1;