## Writing Controllers

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.

  // processed by the API server eviction subresource handler but has not
  // yet been observed by the PodDisruptionBudget controller.
  // A pod will be in this map from the time when the API server processed the
  // eviction request to the time when the pod is seen by PDB controller
  // as having been marked for deletion (or after a timeout). The key in the map is the name of the pod

  // +optional
  optional EventSeries series = 3;

  // reportingController is the name of the controller that emitted this Event, e.g. `kubernetes.io/kubelet`.
  // This field cannot be empty for new Events.
  optional string reportingController = 4;

  // reportingInstance is the ID of the controller instance, e.g. `kubelet-xyzf`.
  // This field cannot be empty for new Events and it can have at most 128 characters.

  // If not specified, this will default to the time zone of the kube-controller-manager process.
  // The set of valid time zone names and the time zone offset is loaded from the system-wide time zone
  // database by the API server during CronJob validation and the controller manager during execution.
  // If no system-wide time zone database can be found a bundled version of the database is used instead.

Standalone erasure coded configuration with 4 sets with 16 drives each, which spawns drives across controllers.

```
minio server /mnt/controller{1...4}/data{1...16}
```

Standalone erasure coded configuration with 16 sets, 16 drives per set, across mounts and controllers.

```
minio server /mnt{1...4}/controller{1...4}/data{1...16}
```

  // +optional
  optional EventSeries series = 3;

  // reportingController is the name of the controller that emitted this Event, e.g. `kubernetes.io/kubelet`.
  // This field cannot be empty for new Events.
  // +optional
  optional string reportingController = 4;

  // reportingInstance is the ID of the controller instance, e.g. `kubelet-xyzf`.
  // This field cannot be empty for new Events and it can have at most 128 characters.

  // +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;

  // honor this field as long as the requested duration is not greater than the
  // maximum duration they will honor per the --cluster-signing-duration CLI
  // flag to the Kubernetes controller manager.
  //
  // Certificate signers may not honor this field for various reasons:
  //
  //   1. Old signer that is unaware of the field (such as the in-tree
  //      implementations prior to v1.22)

  // +optional
  optional string patchType = 5;

  // AuditAnnotations is an unstructured key value map set by remote admission controller (e.g. error=image-blacklisted).
  // MutatingAdmissionWebhook and ValidatingAdmissionWebhook admission controller will prefix the keys with
  // admission webhook name (e.g. imagepolicy.example.com/error=image-blacklisted). AuditAnnotations will be provided by

  // +optional
  optional string patchType = 5;

  // AuditAnnotations is an unstructured key value map set by remote admission controller (e.g. error=image-blacklisted).
  // MutatingAdmissionWebhook and ValidatingAdmissionWebhook admission controller will prefix the keys with
  // admission webhook name (e.g. imagepolicy.example.com/error=image-blacklisted). AuditAnnotations will be provided by