// 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.

  // metadata.Name indicates the name of the CSI driver that this object
  // refers to; it MUST be the same name returned by the CSI GetPluginName()
  // call for that driver.
  // The driver name must be 63 characters or less, beginning and ending with
  // an alphanumeric character ([a-z0-9A-Z]) with dashes (-), dots (.), and
  // alphanumerics between.

  // available.
  // +optional
  optional int32 minReplicas = 2;

  // maxReplicas is the upper limit for the number of replicas to which the autoscaler can scale up.
  // It cannot be less that minReplicas.
  optional int32 maxReplicas = 3;

  // metrics contains the specifications for which to use to calculate the
  // desired replica count (the maximum replica count across all metrics will

  // Pod Topology Spread treats "global minimum" as 0, and then the calculation of Skew is performed.
  // And when the number of eligible domains with matching topology keys equals or greater than minDomains,
  // this value has no effect on scheduling.
  // As a result, when the number of eligible domains is less than minDomains,

  // +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;

// compares the MaximumVolumeSize against the requested size of pending volumes
// to filter out unsuitable nodes. If MaximumVolumeSize is unset, it falls back
// to a comparison against the less precise Capacity. If that is also unset,
// the scheduler assumes that capacity is insufficient and tries some other
// node.
message CSIStorageCapacity {

under the `kubelet` process. On systems with `journalctl` the following is an example command line
to view the last 1000 `kubelet` logs via the `less` utility to allow for `vi`-style searching:

```console
$ journalctl -t kubelet -n 1000 | less
```

#### GKE via Stackdriver Log Viewer

Each GKE cluster's will have many categories of logs collected by Stackdriver.  Logs can be monitored via