## Privileges required

  // driver can be mounted separately with different `-o context` options. This is
  // typical for storage backends that provide volumes as filesystems on block
  // devices or as independent shared volumes.
  // Kubernetes will call NodeStage / NodePublish with "-o context=xyz" mount
  // option when mounting a ReadWriteOncePod volume used in Pod that has

  //
  // Validation requirements:
  //  1. certificate must contain one or more PEM blocks.
  //  2. All PEM blocks must have the "CERTIFICATE" label, contain no headers, and the encoded data
  //   must be a BER-encoded ASN.1 Certificate structure as described in section 4 of RFC5280.
  //  3. Non-PEM content may appear before or after the "CERTIFICATE" PEM blocks and is unvalidated,

  // driver can be mounted separately with different `-o context` options. This is
  // typical for storage backends that provide volumes as filesystems on block
  // devices or as independent shared volumes.
  // Kubernetes will call NodeStage / NodePublish with "-o context=xyz" mount
  // option when mounting a ReadWriteOncePod volume used in Pod that has

This is consumed in two ways:
* Some components just block on `watcher.WaitForCRD(...)` before doing the work they need.
* `kclient.NewDelayedInformer` can also fully abstract this away, by providing a client that handles this behind the scenes.

#### Credentials Controller

// that should not be included within this rule.
message IPBlock {
  // CIDR is a string representing the IP Block
  // Valid examples are "192.168.1.0/24" or "2001:db8::/64"
  optional string cidr = 1;

  // Except is a slice of CIDRs that should not be included within an IP Block
  // Valid examples are "192.168.1.0/24" or "2001:db8::/64"
  // Except values will be rejected if they are outside the CIDR range

### K8s settings

Rather than defining selective mappings from parameters to fields in K8s resources, the `IstioOperatorSpec` API
contains a consistent K8s block for each Istio component. The available K8s settings are defined in
[KubernetesResourcesSpec](https://github.com/istio/api/blob/7791470ecc4c5e123589ff2b781f47b1bcae6ddd/mesh/v1alpha1/component.proto#L103):