labelSelectorRequirement

A label selector requirement is a selector that contains values, a key, and an operator that relates the key and values.

withKey
```
withKey(key)
```
key is the label key that the selector applies to.
withOperator
```
withOperator(operator)
```
operator represents a key’s relationship to a set of values. Valid operators are In, NotIn, Exists and DoesNotExist.
withValues
```
withValues(values)
```
values is an array of string values. If the operator is In or NotIn, the values array must be non-empty. If the operator is Exists or DoesNotExist, the values array must be empty. This array is replaced during a strategic merge patch.
withValuesMixin
```
withValuesMixin(values)
```
values is an array of string values. If the operator is In or NotIn, the values array must be non-empty. If the operator is Exists or DoesNotExist, the values array must be empty. This array is replaced during a strategic merge patch.