## Reference

  // parameters that will be used by the driver when allocating a
  // resource that uses this class. A dynamic resource driver can
  // distinguish between parameters stored here and and those stored in
  // ResourceClaimSpec.
  // +optional
  optional ResourceClassParametersReference parametersRef = 3;

  // Only nodes matching the selector will be considered by the scheduler

  // +optional
  // +patchMergeKey=type
  // +patchStrategy=merge
  // +listType=atomic
  repeated JobCondition conditions = 1;

  // Represents time when the job controller started processing a job. When a
  // Job is created in the suspended state, this field is not set until the
  // first time it is resumed. This field is reset every time a Job is resumed
  // from suspension. It is represented in RFC3339 form and is in UTC.

### Writing controllers

Istio provides a few helper libraries to get started writing a controller. While these libraries help, there are still a lot of subtleties in correctly writing (and testing!) a controller properly.

To get started writing a controller, review the [Example Controller](../../pkg/kube/controllers/example_test.go).

### Controllers overview

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