to.
                            type: string
                          operator:
                            description: operator represents a key's relationship
                              to a set of values. Valid operators are In, NotIn, Exists
                              and DoesNotExist.
                            type: string
                          values:

// that relates the key and values.
message NodeSelectorRequirement {
  // The label key that the selector applies to.
  optional string key = 1;

  // Represents a key's relationship to a set of values.
  // Valid operators are In, NotIn, Exists, DoesNotExist. Gt, and Lt.
  optional string operator = 2;

  // An array of string values. If the operator is In or NotIn,

1. In IntelliJ, create a new Go Remote debug configuration with default settings.

1. Start debugging process and verify it is working. For example, try adding a breakpoint at Reconcile logic and apply a new CR.

### Relationship between the CLI and controller

The CLI and controller share the same API and codebase for generating manifests from the API. You can think of the

  // When specified, it should match one the container or initContainer
  // names in the pod template.
  // +optional
  optional string containerName = 1;

  // Represents the relationship between the container exit code(s) and the
  // specified values. Containers completed with success (exit code 0) are
  // excluded from the requirement check. Possible values are:
  //

[validate_values.go](pkg/validate/validate_values.go)
and refer to the values.yaml data paths. Hence, these rules have names with a lower case first letter.
Apart from validating the correctness of individual fields, the operator ensure that relationships between values in
different parts of the configuration tree are correct. For example, it's an error to enable a component while its
parent feature is disabled.

## K8s controller

TODO(rcernich).

message LabelSelectorRequirement {
  // key is the label key that the selector applies to.
  // +patchMergeKey=key
  // +patchStrategy=merge
  optional string key = 1;

  // operator represents a key's relationship to a set of values.
  // Valid operators are In, NotIn, Exists and DoesNotExist.
  optional string operator = 2;

  // values is an array of string values. If the operator is In or NotIn,